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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 25, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	HUBG
Entity Registrant Name	Hub Group, Inc.
Entity Central Index Key	0000940942
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		33,700,428
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		662,296

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 17,930	$ 28,557
Accounts receivable trade, net	573,722	583,994
Accounts receivable other	4,467	5,722
Prepaid taxes	12,136	12,088
Prepaid expenses and other current assets	19,009	25,697
TOTAL CURRENT ASSETS	627,264	656,058
Restricted investments	23,265	24,181
Property and equipment, net	568,048	562,150
Other intangibles, net	72,925	74,348
Goodwill, net	348,161	348,661
Other assets	3,607	5,543
TOTAL ASSETS	1,643,270	1,670,941
CURRENT LIABILITIES:
Accounts payable trade	318,962	338,933
Accounts payable other	13,389	12,268
Accrued payroll	22,622	28,994
Accrued other	54,992	59,305
Current portion of capital lease	2,798	2,777
Current portion of long term debt	80,004	77,266
TOTAL CURRENT LIABILITIES	492,767	519,543
Long term debt	194,553	214,808
Non-current liabilities	37,687	37,927
Long term portion of capital lease	6,980	7,696
Deferred taxes	125,611	121,095
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 2,000,000 shares authorized; no shares issued or outstanding in 2018 and 2017
Additional paid-in capital	165,076	173,011
Purchase price in excess of predecessor basis, net of tax benefit of $10,306	(15,458)	(15,458)
Retained earnings	886,883	870,716
Accumulated other comprehensive loss	(165)	(194)
Treasury stock; at cost,7,510,187 shares in 2018 and 7,777,722 shares in 2017	(251,083)	(258,622)
TOTAL STOCKHOLDERS' EQUITY	785,672	769,872
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,643,270	1,670,941
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	412	412
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY:
Common stock	$ 7	$ 7

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Purchase price in excess of predecessor basis, tax benefit	$ 10,306
Treasury stock, shares	7,510,187	7,777,722
Class A Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	97,337,700	97,337,700
Common stock, shares issued	41,224,792	41,224,792
Common stock, shares outstanding	33,714,605	33,447,070
Class B Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	662,300	662,300
Common stock, shares issued	662,296	662,296
Common stock, shares outstanding	662,296	662,296

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 1,095,971	$ 892,756
Transportation costs	973,180	791,171
Gross margin	122,791	101,585
Costs and expenses:
Salaries and benefits	56,007	43,179
Agent fees and commissions	19,142	17,993
General and administrative	20,504	20,824
Depreciation and amortization	4,005	2,412
Total costs and expenses	99,658	84,408
Operating income	23,133	17,177
Other income (expense):
Interest expense	(2,104)	(1,098)
Interest and dividend income	22	130
Other, net	(55)	194
Total other expense	(2,137)	(774)
Income before provision for income taxes	20,996	16,403
Provision for income taxes	4,829	6,069
Net income	16,167	10,334
Other comprehensive income:
Foreign currency translation adjustments	29	64
Total comprehensive income	$ 16,196	$ 10,398
Basic earnings per common share	$ 0.48	$ 0.31
Diluted earnings per common share	$ 0.48	$ 0.31
Basic weighted average number of shares outstanding	33,375	33,205
Diluted weighted average number of shares outstanding	33,478	33,373

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 16,167	$ 10,334
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,599	12,522
Deferred taxes	4,714	5,279
Compensation expense related to share-based compensation plans	3,501	2,609
Gain on sale of assets	(115)	(48)
Changes in operating assets and liabilities:
Restricted investments	916	(1,436)
Accounts receivable, net	11,643	54,600
Prepaid taxes	(47)	(171)
Prepaid expenses and other current assets	6,694	2,795
Other assets	1,866	373
Accounts payable	(19,465)	(13,175)
Accrued expenses	(10,913)	(25,990)
Non-current liabilities	(386)	12
Net cash provided by operating activities	33,174	47,704
Cash flows from investing activities:
Proceeds from sale of equipment	516	1,127
Purchases of property and equipment	(22,179)	(6,625)
Net cash used in investing activities	(21,663)	(5,498)
Cash flows from financing activities:
Proceeds from issuance of debt	16,783
Repayments of long term debt	(34,300)	(11,782)
Stock tendered for payments of withholding taxes	(3,896)	(3,157)
Capital lease payments	(695)	(727)
Net cash used in financing activities	(22,108)	(15,666)
Effect of exchange rate changes on cash and cash equivalents	(30)	56
Net (decrease) increase in cash and cash equivalents	(10,627)	26,596
Cash and cash equivalents beginning of the period	28,557	127,404
Cash and cash equivalents end of the period	17,930	154,000
Supplemental disclosures of cash paid for:
Interest	2,315	1,153
Income taxes	$ 194	$ 263

Interim Financial Statements

3 Months Ended

Mar. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Interim Financial Statements

NOTE 1.

Interim Financial Statements

Our accompanying unaudited consolidated financial statements of Hub Group, Inc. (“we”, “us” or “our”) have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in annual financial statements have been omitted pursuant to those rules and regulations. However, we believe that the disclosures contained herein are adequate to make the information presented not misleading.

The financial statements reflect, in our opinion, all material adjustments (which include only normal recurring adjustments) necessary to fairly present our financial position as of March 31, 2018 and results of operations for the three months ended March 31, 2018 and 2017. Certain amounts in prior periods have been reclassified to conform with current period presentation.

These unaudited consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017. Results of operations in interim periods are not necessarily indicative of results to be expected for a full year due partially to seasonality.

Accounting Standards Update. On January 1, 2018 we adopted the Accounting Standards Codification (ASC) topic 606, Revenue from Contracts with Customers. Under this new standard our significant accounting policy for revenue is as follows:

Revenue: Revenue is recognized at the time 1) persuasive evidence of an arrangement exists, 2) services have been rendered, 3) the sales price is fixed and determinable and 4) collectability is reasonably assured. We generally recognize revenue over time because of continuous transfer of control to the customer. Since control is transferred over time, revenue and related transportation costs are recognized based on relative transit time, which is based on the extent of progress towards completion of the related performance obligation. We enter into contracts that can include various combinations of services, which are capable of being distinct and accounted for as separate performance obligations. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Further, in most cases, we report our revenue on a gross basis because we are the primary obligor as we are responsible for providing the service desired by the customer. Our customers view us as responsible for fulfillment including the acceptability of the service. Services requirements may include, for example, on-time delivery, handling freight loss and damage claims, setting up appointments for pick-up and delivery and tracing shipments in transit. We have discretion in setting sales prices and as a result, the amount we earn varies. In addition, we have the discretion to select our vendors from multiple suppliers for the services ordered by our customers. These factors, discretion in setting prices and discretion in selecting vendors, further support reporting revenue on a gross basis for most of our revenue.

The Company capitalizes commissions incurred in connection with obtaining a contract. The Company capitalized commissions associated with dedicated services of $54,000 at March 31, 2018. Capitalized commission fees are amortized based on the transfer of services to which the assets relate and are included in selling, general and administrative expenses. In 2018, the amount of amortization was $3,278.

Costs incurred to fulfill an intermodal, truck brokerage or logistics contract are expensed as incurred according to the practical expedient that allows contract acquisition costs to be recognized immediately if the deferral period is one year or less.

The Company applied Topic 606 retrospectively using the practical expedient in paragraph 606-10-65-1(f)(3), under which the Company does not disclose the amount of consideration allocated to the remaining performance obligations or an explanation of when the Company expects to recognize that amount as revenue for all reporting periods presented before January 1, 2018. We do not generally have a remaining performance obligation due to revenue generally being recognized using relevant transit time. We only had one significant accounting policy change that is disclosed below:

Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by Hub Group from a customer were previously recorded on a gross basis. Under Topic 606, these taxes are excluded from revenue. This change had an effect of $0.7 million on revenue and transportation costs for the three months ending March 31, 2017.

Acquisition

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Acquisition

NOTE 2.

Acquisition

Hub Group Trucking (HGT), a wholly owned subsidiary of Hub Group, Inc., acquired all of the outstanding equity interests of Estenson Logistics, LLC (“Estenson”) on July 1, 2017 (the “Estenson Acquisition”). Estenson is now our wholly owned subsidiary, operating under the name Hub Group Dedicated (“HGD”). As a result of the Estenson Acquisition, HGT acquired substantially all of the assets of Estenson, which include tractors and trailers, as well as assumed certain liabilities, including equipment debt. HGD is included in the Hub segment.

As of March 31, 2018, HGD has an operating fleet of approximately 1,300 tractors and 4,500 trailers. Dedicated services have been requested by our customers and we believe HGD is an excellent service offering that we can provide to our customers.

The base purchase price for Estenson was approximately $284.7 million, including contingent consideration related to an earn-out provision included in the Purchase Agreement, which will not exceed $6.0 million and is based on Estenson’s EBITDA results through June 30, 2019. In accordance with the agreement, the base purchase price was adjusted by the assumed debt to arrive at the final consideration of $171.7 million. To facilitate the acquisition, we assumed $113.0 million of Estenson debt and paid $165.9 million in cash, including $55.0 million of cash which was borrowed under our credit agreement.

The following table summarizes the total purchase price allocated to the net assets acquired (in thousands):

Cash paid	$	165,945
Consideration payable		1,081
Contingent consideration, fair value		4,703
Total consideration		171,729
Equipment debt assumed		112,962
Total base purchase price	$	284,691

The following table summarizes the allocation of the total consideration to the assets acquired and liabilities assumed as of the date of the acquisition (in thousands):

	July 1, 2017
Cash and cash equivalents	$	12
Accounts receivable trade		26,909
Accounts receivable other		165
Prepaid expenses and other current assets		1,500
Property and equipment		128,477
Other intangibles		66,400
Goodwill		86,059
Other assets		64
Total assets acquired	$	309,586

Accounts payable trade	$	4,110
Accrued payroll		5,727
Accrued other		15,058
Equipment debt		112,962
Total liabilities assumed	$	137,857

Total consideration	$	171,729

The Estenson acquisition was accounted for as a purchase business combination in accordance with ASC 805 “Business Combinations.” Assets acquired and liabilities assumed were recorded in the accompanying consolidated balance sheet at their estimated fair values as of July 1, 2017 with the remaining unallocated purchase price recorded as goodwill. The goodwill recognized in the Estenson acquisition was primarily attributable to potential expansion and future development of the acquired business. The fair value assigned to the customer relationships identifiable intangible was determined using an income approach based on management’s estimates and assumptions. The fair value assigned to the property and equipment was determined based on a market approach. A probability weighted expected return model was used to estimate the value of the contingent consideration. Equipment debt was valued using a discounted cash flow analysis whereby future contractual principal repayments and interest payments for each instrument were discounted to the purchase date at a risk-adjusted discount rate.

The components of “Other intangibles” listed in the above table as of the acquisition date are as follows (in thousands):

			Accumulated		Balance at		Estimated Useful
	Amount		Amortization		March 31, 2018		Life
Customer relationships	$	66,000	$	3,300	$	62,700	15 years
Trade name	$	400	$	400	$	0	3 months

The above intangible assets are amortized using the straight-line method. Amortization expense related to this acquisition for the three month period ended March 31, 2018 was $1.1 million. The intangible assets have a weighted average useful life of approximately 14 years. Amortization expense related to HGD for the next five years is as follows (in thousands):

Remainder 2018	$	3,300
2019		4,400
2020		4,400
2021		4,400
2022		4,400

The following unaudited pro forma consolidated results of operations for 2017 assume that the acquisition of Estenson was completed as of January 1, 2017 (in thousands, except for per share amounts):

	Three Months
	Ended
	March 31, 2017
Revenue	$	947,344
Net income	$	11,603
Earnings per share
Basic	$	0.35
Diluted	$	0.35

The unaudited pro forma consolidated results for the three month period was prepared using the acquisition method of accounting and are based on the historical financial information of Hub Group and HGD. The historical financial information has been adjusted to give effect to the pro forma adjustments that are: (i) directly attributable to the acquisition, (ii) factually supportable and (iii) expected to have a continuing impact on the combined results. The unaudited pro forma consolidated results are not necessarily indicative of what our consolidated results of operations actually would have been had we completed the acquisition on January 1, 2017.

Business Segments

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Business Segments

NOTE 3.

Business Segments

We report two distinct business segments. The first segment is Mode, which includes the Mode Transportation, LLC (“Mode LLC”) business only. The second segment is Hub, which is all business other than Mode.

Hub offers comprehensive multimodal solutions including intermodal, truck brokerage, logistics and dedicated services. Our employees operate the freight through a network of operating centers located in the United States, Canada and Mexico. Each operating center is strategically located in a market with a significant concentration of shipping customers and one or more railheads. Hub has full time employees located throughout the United States, Canada and Mexico.

Mode LLC has Independent Business Owners (“IBOs”) who sell and operate the business throughout North America, as well as sales only agents. Mode LLC also has a corporate office in Dallas, TX, a temperature protected services division, Temstar, located in Oak Brook, IL and a corporate office in Memphis, TN.

Mode LLC markets and operates its freight transportation services, consisting of intermodal, truck brokerage and logistics, primarily through agents who enter into contractual arrangements with Mode LLC.

Our transportation services for both Hub and Mode segments can be broadly placed into the following categories:

Intermodal. As an intermodal provider, we arrange for the movement of our customers’ freight in containers and trailers, typically over long distances of 750 miles or more. We contract with railroads to provide transportation for the long-haul portion of the shipment and with local trucking companies, known as “drayage companies,” for pickup and delivery. As part of our intermodal services, we negotiate rail and drayage rates, electronically track shipments in transit, consolidate billing and handle claims for freight loss or damage on behalf of our customers.

Truck Brokerage (Highway Services). We are one of the largest truck brokers in the United States, providing customers with a highway service option for their transportation needs. We match the customers’ needs with carriers’ capacity to provide the most effective service and price combination. We have contracts with a substantial base of carriers allowing us to meet the varied needs of our customers. As part of the truck brokerage services, we negotiate rates, track shipments in transit and handle claims for freight loss and damage on behalf of our customers.

Logistics and Other Services. Hub’s logistics business operates under the name of Unyson Logistics. Unyson Logistics is comprised of a network of logistics professionals dedicated to developing, implementing and operating customized logistics solutions for customers. Unyson Logistics offers a wide range of transportation management services and technology solutions including shipment optimization, load consolidation, mode selection, carrier management, load planning and execution and web-based shipment visibility. Unyson Logistics operates throughout North America, providing services through its main operating location in St. Louis with additional support locations in the Boston, Chicago, Cleveland and Minneapolis metro areas. In addition, certain Mode LLC agents also provide logistics services. Our multi-modal transportation capabilities for both the Hub and Mode segments include small parcel, heavyweight, expedited, less-than-truckload, truckload, intermodal, railcar and international shipping.

Dedicated: Our dedicated service line, HGD, contracts with customers who wish to outsource a portion of their transportation needs. We offer a dedicated fleet of equipment and drivers to each customer, as well as the management and infrastructure to operate according to the customer’s high service expectations.

The following is a summary of operating results and certain other financial data for our business segments (in thousands):

	Three Months									Three Months
	Ended March 31, 2018									Ended March 31, 2017
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Revenue	$	831,585	$	287,899	$	(23,513	)	$	1,095,971	$	676,480	$	241,834	$	(25,558	)	$	892,756
Transportation costs		741,211		255,482		(23,513	)		973,180		604,674		212,055		(25,558	)		791,171
Gross margin		90,374		32,417		-			122,791		71,806		29,779		-			101,585

Costs and expenses:
Salaries and benefits		52,070		3,937		-			56,007		39,596		3,583		-			43,179
Agent fees and commissions		13		19,129		-			19,142		17		17,976		-			17,993
General and administrative		18,402		2,102		-			20,504		18,479		2,345		-			20,824
Depreciation and amortization		3,760		245		-			4,005		2,109		303		-			2,412
Total costs and expenses		74,245		25,413		-			99,658		60,201		24,207		-			84,408

Operating income	$	16,129	$	7,004	$	-		$	23,133	$	11,605	$	5,572	$	-		$	17,177

Capital Expenditures	$	21,537	$	642	$	-		$	22,179	$	6,625	$	-	$	-		$	6,625

	As of March 31, 2018									As of December 31, 2017
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Total assets	$	1,444,239	$	205,070	$	(6,039	)	$	1,643,270	$	1,470,792	$	210,088	$	(9,939	)	$	1,670,941
Goodwill		318,772		29,389		-			348,161		319,272		29,389		-			348,661

On January 1, 2018, the Company adopted ASC Topic 606 using the modified retrospective method applied to those contracts that were not completed as of January 1, 2018. Segment revenues were not significantly impacted under ASC Topic 606. The tables below represent disaggregated revenue from contracts with customers.

The following tables summarize our revenue by segment and business line (in thousands):

	Three Months									Three Months
	Ended March 31, 2018									Ended March 31, 2017
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Intermodal	$	482,495	$	129,773	$	(11,270	)	$	600,998	$	424,423	$	122,181	$	(15,237	)	$	531,367
Truck brokerage		120,019		100,721		(358	)		220,382		106,185		78,161		(385	)		183,961
Logistics		168,676		57,405		(11,870	)		214,211		145,872		41,492		(9,936	)		177,428
Dedicated		60,395		-		(15	)		60,380		-		-		-			-
Total revenue	$	831,585	$	287,899	$	(23,513	)	$	1,095,971	$	676,480	$	241,834	$	(25,558	)	$	892,756

Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 4.

Earnings Per Share

The following is a reconciliation of our earnings per share (in thousands, except for per share data):

	Three Months Ended, March 31,
	2018		2017

Net income for basic and diluted earnings per share	$	16,167	$	10,334

Weighted average shares outstanding - basic		33,375		33,205

Dilutive effect of stock options and restricted stock		103		168

Weighted average shares outstanding - diluted		33,478		33,373

Earnings per common share - basic	$	0.48	$	0.31

Earnings per common share - diluted	$	0.48	$	0.31

Fair Value Measurement

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

NOTE 5.

Fair Value Measurement

The carrying value of cash and cash equivalents, accounts receivable and accounts payable approximated fair value as of March 31, 2018 and December 31, 2017. At March 31, 2018 and December 31, 2017 the fair value of the Company’s fixed-rate borrowings was $3.5 million and $2.4 million less than the historical carrying value of $244.6 million and $247.1 million. The fair value of the fixed-rate borrowings was estimated using an income approach based on current interest rates available to the Company for borrowings on similar terms and maturities.

We consider as cash equivalents all highly liquid instruments with an original maturity of three months or less. As of March 31, 2018 and December 31, 2017, our cash and temporary investments were with high quality financial institutions in Demand Deposit Accounts (DDAs) and Savings Accounts.

Restricted investments, as of March 31, 2018 of $23.3 million and December 31, 2017 of $24.2 million, included mutual funds which are reported at fair value.

Our assets and liabilities measured at fair value are based on valuation techniques which consider prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. These valuation methods are based on either quoted market prices (Level 1) or inputs, other than quoted prices in active markets, that are observable either directly or indirectly (Level 2). Cash and cash equivalents, accounts receivable and accounts payable are defined as “Level 1”, while long term debt is defined as “Level 2” of the fair value hierarchy in the Fair Value Measurements and Disclosures Topic of the Codification.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Long-Term Debt and Financing Arrangements

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt and Financing Arrangements

NOTE 6.

Long-Term Debt and Financing Arrangements

At March 31, 2018, we were authorized to borrow up to $350 million under a revolving line of credit. At March 31, 2018, we had $30.0 million outstanding.

We have standby letters of credit that expire at various dates in 2018. As of March 31, 2018, our letters of credit were $21.2 million.

Our unused and available borrowings under our bank revolving line of credit were $298.8 million as of March 31, 2018 and $284.9 million as of December 31, 2017. We were in compliance with our debt covenants as of March 31, 2018 and December 31, 2017.

We have entered into various Equipment Notes (“Notes”) for the purchase of tractors and containers. The Notes are secured by the underlying equipment financed in the agreements.

	March 31,			December 31,
	2018			2017
	(in thousands except principal and interest payments)

Revolving line of credit	$	30,000		$	45,000

Secured Equipment Notes due on various dates in 2024 with monthly principal and interest payments between $403 and $83,000 commencing on various dates in 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.85% and 3.41%		13,119			13,586

Secured Equipment Notes due on various dates in 2023 with monthly principal and interest payments between $669 and $187,963 commencing on various dates in 2016, 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.23% and 3.66%		52,186			36,981

Secured Equipment Notes due on various dates in 2022 with monthly principal and interest payments between $3,030 and $254,190 commencing on various dates from 2015 to 2017; interest is paid monthly at a fixed annual rate of between 2.16% and 2.87%		28,709			30,301

Secured Equipment Notes due on various dates in 2021 with monthly principal and interest payments between $1,940 and $326,333 commencing on various dates from 2014 to 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96%		70,999			76,885

Secured Equipment Notes due on various dates in 2020 with monthly principal and interest payments between $6,175 and $398,496 commencing on various dates from 2013 to 2016; interest is paid monthly at a fixed annual rate between 1.72% and 2.78%		46,777			50,737

Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $1,594 and $325,050 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 1.87% and 2.62%		30,748			36,178

Secured Equipment Notes due on various dates in 2018 with monthly principal and interest payments between $6,480 and $163,428 commencing on various dates in 2013 and 2014; interest is paid monthly at a fixed annual rate between 2.05% and 2.7%		2,019			2,406

		274,557			292,074

Less current portion		(80,004	)		(77,266	)
Total long-term debt	$	194,553		$	214,808

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 7. Commitments and Contingencies In November 2016, we committed to acquire 4,000 53’ containers. As of March 31, 2018 we received 2,947 containers, which were financed with debt, and we expect to receive the remaining 1,053 units from April to July of 2018. We expect to finance these units with debt. Since January 1, 2018 we have committed to acquire 787 tractors for $98.5 million. As of April 2018 we received 54 tractors, which are being financed with debt, and we expect to receive the remaining 733 tractors from April to December of 2018. We expect to finance these tractors with debt. Since January 1, 2018 we have committed to acquire 535 trailers for $16.9 million. As of April 2018 we received 10 trailers, which will be financed with debt, and we expect to receive the remaining 525 trailers from April to December of 2018. We expect to finance these trailers with debt.

Legal Matters

3 Months Ended

Mar. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Legal Matters

NOTE 8.

Legal Matters

Robles

On January 25, 2013, a complaint was filed in the U.S. District Court for the Eastern District of California (Sacramento Division) by Salvador Robles against our subsidiary Hub Group Trucking, Inc (“HGT”). The action is brought on behalf of a class comprised of present and former California-based truck drivers for HGT who were classified as independent contractors, from January 2009 to August 2014. It alleges HGT has misclassified such drivers as independent contractors and that such drivers were employees. It asserts various violations of the California Labor Code and claims that HGT has engaged in unfair competition practices. The complaint seeks, among other things, declaratory and injunctive relief, monetary damages and attorney’s fees. In May 2013, the complaint was amended to add similar claims based on Mr. Robles’ status as an employed company driver. These additional claims are only on behalf of Mr. Robles and not a putative class.

The Company believes that the California independent contractor truck drivers were properly classified as independent contractors at all times. Nevertheless, because lawsuits are expensive, time-consuming and could interrupt our business operations, HGT decided to make settlement offers to individual drivers with respect to the claims alleged in this lawsuit, without admitting liability. As of December 31, 2017, 96% of the California drivers have accepted the settlement offers. In late 2014, HGT decided to convert its model from independent contractors to employee drivers in California (the “Conversion”). In early 2016, HGT closed its operations in Southern California.

On April 3, 2015, the Robles case was transferred to the U.S. District Court for the Western District of Tennessee (Western Division) in Memphis. On May 15, 2015, Plaintiffs filed a Second Amended Complaint (“SAC”) which names 334 current and former HGT drivers as “interested putative class members.” In addition to reasserting their existing claims, the SAC includes claims post-Conversion, added two Plaintiffs (who had signed the settlement agreement above) and seeks a judicial declaration that the settlement agreements are unenforceable. On June 8, 2015, HGT filed a motion to dismiss the SAC and on July 19, 2016, HGT’s motion to dismiss was granted in part, and denied in part, by the District Court. The motion to dismiss was granted for the claims of all purported class members who have signed settlement agreements and for the plaintiffs’ claims based on quantum merit. It was denied with respect to federal preemption and choice of law. On August 11, 2016, Plaintiffs filed a motion to clarify whether the Court’s dismissal of the claims of all purported class members who signed settlement agreements was with or without prejudice and, if the dismissal was with prejudice, Plaintiffs moved the Court to revise and reconsider the order. Plaintiffs’ motion for clarification/reconsideration has been fully briefed and the parties are awaiting a decision by the Court.

Adame

On August 5, 2015, the Plaintiffs’ law firm in the Robles case filed a lawsuit in state court in San Bernardino County, California on behalf of 63 named Plaintiffs against HGT and five Hub and HGT employees. The lawsuit alleges claims similar to those being made in Robles and seeks penalties under California’s Private Attorneys General Act (“PAGA”). Of the 63 named Plaintiffs, at least 58 signed settlement agreements.

On October 29, 2015, Defendants filed a notice of removal to move the case from state court in San Bernardino to federal court in the Central District of California. On November 19, 2015, Plaintiffs filed a motion to remand the case back to state court, claiming that the federal court lacks jurisdiction over the case because there is not complete diversity of citizenship between the parties and the amount in controversy threshold is not satisfied. The court granted Plaintiffs’ motion to remand to the state court in San Bernardino County on April 7, 2016.

On July 11, 2016, Defendants filed dismissal papers in state court, asking the court to dismiss Plaintiffs’ suit for various reasons, including that the agreement between HGT and its former California owner operators requires that this action be brought in Memphis, Tennessee, or stay the action pending the outcome of Robles. Defendants also asked the court to dismiss the individual defendants because PAGA’s language does not allow for individual liability. During a hearing on October 5, 2016, the judge issued an oral tentative ruling stating that the choice of forum provision was unenforceable. On February 17, 2017, with the stipulation of the parties, the Court entered an order dismissing, without prejudice, all of the individual Defendants and accepting the parties’ agreement that jurisdiction and venue are proper in the San Bernardino Superior Court and that Defendants will not seek to remove the case to federal district court. On April 12, 2017, the Court denied Defendant’s motion to dismiss based on insufficiency of the PAGA letter notice. On October 19, 2017, Plaintiffs filed an amended complaint, dismissing the previously named individuals as Defendants. On December 4, 2017, Defendants filed an Answer to Plaintiffs’ First Amended Complaint and a Memorandum of Points and Authorities in Support of their Motion for Judgment on the Pleadings arguing that judgement should be entered for Defendants because Plaintiffs’ claims are preempted by the Federal Truth-In-Leasing regulations. On January 31, 2018, a hearing was held on the motion to dismiss, and on February 1, 2018, the motion was denied. On March 27, 2018, Defendants filed a petition for a writ of mandate with the Court of Appeals. There is no timetable for when the Court of Appeals will decide if it will hear the appeal.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 9. Income Taxes The provision for income taxes decreased to $4.8 million in 2018 from $6.1 million in 2017. We provided for income taxes using an effective rate of 23.0% in 2018 and an effective rate of 37.0% in 2017. The 2018 effective tax rate was lower primarily due to the enactment of the U.S. Tax Cuts and Jobs Act (the “Act”) on December 22, 2017, which reduced the US federal corporate tax rate from 35% to 21%. We expect our effective tax rate for the remainder of 2018 will range from 24.5% to 25.5%. Due to the complexities involved in accounting for the enactment of the Act, the SEC Staff Accounting Bulletin No. 118 (“SAB No. 118”) allows for a one-year period, from the date of enactment, to complete the related income tax accounting for the Act and allows for the use of provisional amounts until that accounting is complete. The Company recorded provisional amounts in earnings for the year ended December 31, 2017 as certain deferred tax assets and liabilities were remeasured based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing aspects of the Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts until the federal income tax return for 2017 is filed later this year.

New Pronouncements

3 Months Ended

Mar. 31, 2018

Accounting Changes And Error Corrections [Abstract]

New Pronouncements

NOTE 10.

New Pronouncements

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business. This ASU clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. This standard was adopted on January 1, 2018. Any impact would apply to future acquisitions.

In 2016, the FASB issued new guidance that requires credit losses on financial assets measured at amortized cost basis to be presented at the net amount expected to be collected, not based on incurred losses. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 is permitted. We are evaluating the impact of adopting this new accounting guidance on our consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires lessees to recognize a right-to-use asset and a lease obligation for all leases. Lessees are permitted to make an accounting policy election to not recognize an asset and liability for leases with a term of twelve months or less. The new standard will become effective beginning with the first quarter of 2019. Early adoption of the standard is permitted. We plan to adopt this standard January 1, 2019, as required. We are currently reviewing our leases and evaluating the impact the adoption of this accounting guidance will have on the consolidated financial statements.

Interim Financial Statements (Policies)	3 Months Ended
Interim Financial Statements (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Revenue	Revenue: Revenue is recognized at the time 1) persuasive evidence of an arrangement exists, 2) services have been rendered, 3) the sales price is fixed and determinable and 4) collectability is reasonably assured. We generally recognize revenue over time because of continuous transfer of control to the customer. Since control is transferred over time, revenue and related transportation costs are recognized based on relative transit time, which is based on the extent of progress towards completion of the related performance obligation. We enter into contracts that can include various combinations of services, which are capable of being distinct and accounted for as separate performance obligations. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Further, in most cases, we report our revenue on a gross basis because we are the primary obligor as we are responsible for providing the service desired by the customer. Our customers view us as responsible for fulfillment including the acceptability of the service. Services requirements may include, for example, on-time delivery, handling freight loss and damage claims, setting up appointments for pick-up and delivery and tracing shipments in transit. We have discretion in setting sales prices and as a result, the amount we earn varies. In addition, we have the discretion to select our vendors from multiple suppliers for the services ordered by our customers. These factors, discretion in setting prices and discretion in selecting vendors, further support reporting revenue on a gross basis for most of our revenue. The Company capitalizes commissions incurred in connection with obtaining a contract. The Company capitalized commissions associated with dedicated services of $54,000 at March 31, 2018. Capitalized commission fees are amortized based on the transfer of services to which the assets relate and are included in selling, general and administrative expenses. In 2018, the amount of amortization was $3,278. Costs incurred to fulfill an intermodal, truck brokerage or logistics contract are expensed as incurred according to the practical expedient that allows contract acquisition costs to be recognized immediately if the deferral period is one year or less. The Company applied Topic 606 retrospectively using the practical expedient in paragraph 606-10-65-1(f)(3), under which the Company does not disclose the amount of consideration allocated to the remaining performance obligations or an explanation of when the Company expects to recognize that amount as revenue for all reporting periods presented before January 1, 2018. We do not generally have a remaining performance obligation due to revenue generally being recognized using relevant transit time. We only had one significant accounting policy change that is disclosed below: Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by Hub Group from a customer were previously recorded on a gross basis. Under Topic 606, these taxes are excluded from revenue. This change had an effect of $0.7 million on revenue and transportation costs for the three months ending March 31, 2017.

Acquisition (Tables) - Estenson Logistics, LLC [Member]

3 Months Ended

Mar. 31, 2018

Summary of Total Purchase Price Allocated to Net Assets Acquired

The following table summarizes the total purchase price allocated to the net assets acquired (in thousands):

Cash paid	$	165,945
Consideration payable		1,081
Contingent consideration, fair value		4,703
Total consideration		171,729
Equipment debt assumed		112,962
Total base purchase price	$	284,691

Summarizes the Allocation of Total Consideration to the Assets Acquired and Liabilities Assumed

The following table summarizes the allocation of the total consideration to the assets acquired and liabilities assumed as of the date of the acquisition (in thousands):

	July 1, 2017
Cash and cash equivalents	$	12
Accounts receivable trade		26,909
Accounts receivable other		165
Prepaid expenses and other current assets		1,500
Property and equipment		128,477
Other intangibles		66,400
Goodwill		86,059
Other assets		64
Total assets acquired	$	309,586

Accounts payable trade	$	4,110
Accrued payroll		5,727
Accrued other		15,058
Equipment debt		112,962
Total liabilities assumed	$	137,857

Total consideration	$	171,729

Components of Other Intangibles Acquired

The components of “Other intangibles” listed in the above table as of the acquisition date are as follows (in thousands):

			Accumulated		Balance at		Estimated Useful
	Amount		Amortization		March 31, 2018		Life
Customer relationships	$	66,000	$	3,300	$	62,700	15 years
Trade name	$	400	$	400	$	0	3 months

Amortization Expense

Amortization expense related to HGD for the next five years is as follows (in thousands):

Remainder 2018	$	3,300
2019		4,400
2020		4,400
2021		4,400
2022		4,400

Unaudited Pro forma Consolidated Results of Operations

The following unaudited pro forma consolidated results of operations for 2017 assume that the acquisition of Estenson was completed as of January 1, 2017 (in thousands, except for per share amounts):

	Three Months
	Ended
	March 31, 2017
Revenue	$	947,344
Net income	$	11,603
Earnings per share
Basic	$	0.35
Diluted	$	0.35

Business Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Summary of Operating Results and Certain Other Financial Data

The following is a summary of operating results and certain other financial data for our business segments (in thousands):

	Three Months									Three Months
	Ended March 31, 2018									Ended March 31, 2017
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Revenue	$	831,585	$	287,899	$	(23,513	)	$	1,095,971	$	676,480	$	241,834	$	(25,558	)	$	892,756
Transportation costs		741,211		255,482		(23,513	)		973,180		604,674		212,055		(25,558	)		791,171
Gross margin		90,374		32,417		-			122,791		71,806		29,779		-			101,585

Costs and expenses:
Salaries and benefits		52,070		3,937		-			56,007		39,596		3,583		-			43,179
Agent fees and commissions		13		19,129		-			19,142		17		17,976		-			17,993
General and administrative		18,402		2,102		-			20,504		18,479		2,345		-			20,824
Depreciation and amortization		3,760		245		-			4,005		2,109		303		-			2,412
Total costs and expenses		74,245		25,413		-			99,658		60,201		24,207		-			84,408

Operating income	$	16,129	$	7,004	$	-		$	23,133	$	11,605	$	5,572	$	-		$	17,177

Capital Expenditures	$	21,537	$	642	$	-		$	22,179	$	6,625	$	-	$	-		$	6,625

Schedule of Assets

	As of March 31, 2018									As of December 31, 2017
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Total assets	$	1,444,239	$	205,070	$	(6,039	)	$	1,643,270	$	1,470,792	$	210,088	$	(9,939	)	$	1,670,941
Goodwill		318,772		29,389		-			348,161		319,272		29,389		-			348,661

Summary of Revenue by Segment and Business Line

The following tables summarize our revenue by segment and business line (in thousands):

	Three Months									Three Months
	Ended March 31, 2018									Ended March 31, 2017
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Intermodal	$	482,495	$	129,773	$	(11,270	)	$	600,998	$	424,423	$	122,181	$	(15,237	)	$	531,367
Truck brokerage		120,019		100,721		(358	)		220,382		106,185		78,161		(385	)		183,961
Logistics		168,676		57,405		(11,870	)		214,211		145,872		41,492		(9,936	)		177,428
Dedicated		60,395		-		(15	)		60,380		-		-		-			-
Total revenue	$	831,585	$	287,899	$	(23,513	)	$	1,095,971	$	676,480	$	241,834	$	(25,558	)	$	892,756

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of Earnings Per Share

The following is a reconciliation of our earnings per share (in thousands, except for per share data):

	Three Months Ended, March 31,
	2018		2017

Net income for basic and diluted earnings per share	$	16,167	$	10,334

Weighted average shares outstanding - basic		33,375		33,205

Dilutive effect of stock options and restricted stock		103		168

Weighted average shares outstanding - diluted		33,478		33,373

Earnings per common share - basic	$	0.48	$	0.31

Earnings per common share - diluted	$	0.48	$	0.31

Long-Term Debt and Financing Arrangements (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

	March 31,			December 31,
	2018			2017
	(in thousands except principal and interest payments)

Revolving line of credit	$	30,000		$	45,000

Secured Equipment Notes due on various dates in 2024 with monthly principal and interest payments between $403 and $83,000 commencing on various dates in 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.85% and 3.41%		13,119			13,586

Secured Equipment Notes due on various dates in 2023 with monthly principal and interest payments between $669 and $187,963 commencing on various dates in 2016, 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.23% and 3.66%		52,186			36,981

Secured Equipment Notes due on various dates in 2022 with monthly principal and interest payments between $3,030 and $254,190 commencing on various dates from 2015 to 2017; interest is paid monthly at a fixed annual rate of between 2.16% and 2.87%		28,709			30,301

Secured Equipment Notes due on various dates in 2021 with monthly principal and interest payments between $1,940 and $326,333 commencing on various dates from 2014 to 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96%		70,999			76,885

Secured Equipment Notes due on various dates in 2020 with monthly principal and interest payments between $6,175 and $398,496 commencing on various dates from 2013 to 2016; interest is paid monthly at a fixed annual rate between 1.72% and 2.78%		46,777			50,737

Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $1,594 and $325,050 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 1.87% and 2.62%		30,748			36,178

Secured Equipment Notes due on various dates in 2018 with monthly principal and interest payments between $6,480 and $163,428 commencing on various dates in 2013 and 2014; interest is paid monthly at a fixed annual rate between 2.05% and 2.7%		2,019			2,406

		274,557			292,074

Less current portion		(80,004	)		(77,266	)
Total long-term debt	$	194,553		$	214,808

Interim Financial Statements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Capitalized commission fees	$ 54,000
Capitalized commission fees, amount of amortization	$ 3,278
(ASC) topic 606 \| Restatement Adjustment [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Effective change on revenue and transportation costs		$ 700,000

Acquisition - Additional Information (Detail) $ in Thousands		3 Months Ended
	Jul. 01, 2017 USD ($)	Mar. 31, 2018 USD ($) Tractor Trailer
Hub Group Dedicated [Member]
Business Acquisition [Line Items]
Number of tractors in operating fleet \| Tractor		1,300
Number of trailers in operating fleet \| Trailer		4,500
Estenson Logistics, LLC [Member]
Business Acquisition [Line Items]
Business acquisition date		Jul. 01, 2017
Business acquisition, purchase price	$ 284,691
Contingent consideration related to an earn-out provision	6,000
Business acquisition, final consideration	171,729
Business acquisition, debt assumed	112,962
Business acquisition, cash paid	165,945
Amount of cash borrowed under new credit agreement	$ 55,000
Amortization expense of intangible assets		$ 1,100
Intangible assets, weighted average useful life		14 years

Summary of Total Purchase Price Allocated to Net Assets Acquired (Detail) - Estenson Logistics, LLC [Member] $ in Thousands	Jul. 01, 2017 USD ($)
Business Acquisition [Line Items]
Cash paid	$ 165,945
Consideration payable	1,081
Contingent consideration, fair value	4,703
Total consideration	171,729
Equipment debt assumed	112,962
Total base purchase price	$ 284,691

Summarizes the Allocation of Total Consideration to the Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jul. 01, 2017
Business Acquisition [Line Items]
Goodwill	$ 348,161	$ 348,661
Estenson Logistics, LLC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 12
Accounts receivable trade			26,909
Accounts receivable other			165
Prepaid expenses and other current assets			1,500
Property and equipment			128,477
Other intangibles			66,400
Goodwill			86,059
Other assets			64
Total assets acquired			309,586
Accounts payable trade			4,110
Accrued payroll			5,727
Accrued other			15,058
Equipment debt			112,962
Total liabilities assumed			137,857
Total consideration			$ 171,729

Components of Other Intangible Acquired (Detail) - Estenson Logistics, LLC [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 66,000
Finite-lived intangible assets, Accumulated Amortization	3,300
Finite-lived intangible assets, Net Carrying Value	$ 62,700
Intangible assets estimated useful life	15 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 400
Finite-lived intangible assets, Accumulated Amortization	400
Finite-lived intangible assets, Net Carrying Value	$ 0
Intangible assets estimated useful life	3 months

Amortization Expense of Intangible Assets (Detail) - Hub Group Dedicated [Member] $ in Thousands	Mar. 31, 2018 USD ($)
Finite Lived Intangible Assets [Line Items]
Remainder 2018	$ 3,300
2019	4,400
2020	4,400
2021	4,400
2022	$ 4,400

Unaudited Pro forma Consolidated Results of Operations (Detail) - Estenson Logistics, LLC [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue \| $	$ 947,344
Net income \| $	$ 11,603
Earnings per share
Basic \| $ / shares	$ 0.35
Diluted \| $ / shares	$ 0.35

Business Segments - Additional Information (Detail)	3 Months Ended
Business Segments - Additional Information (Detail)	Mar. 31, 2018 Segment
Segment Reporting [Abstract]
Reporting business segments	2
Number of railheads	one or more

Summary of Operating Results and Certain Other Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 1,095,971	$ 892,756
Transportation costs	973,180	791,171
Gross margin	122,791	101,585
Costs and expenses:
Salaries and benefits	56,007	43,179
Agent fees and commissions	19,142	17,993
General and administrative	20,504	20,824
Depreciation and amortization	4,005	2,412
Total costs and expenses	99,658	84,408
Operating income	23,133	17,177
Capital Expenditures	22,179	6,625
Operating Segments [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	831,585	676,480
Transportation costs	741,211	604,674
Gross margin	90,374	71,806
Costs and expenses:
Salaries and benefits	52,070	39,596
Agent fees and commissions	13	17
General and administrative	18,402	18,479
Depreciation and amortization	3,760	2,109
Total costs and expenses	74,245	60,201
Operating income	16,129	11,605
Capital Expenditures	21,537	6,625
Operating Segments [Member] \| Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	287,899	241,834
Transportation costs	255,482	212,055
Gross margin	32,417	29,779
Costs and expenses:
Salaries and benefits	3,937	3,583
Agent fees and commissions	19,129	17,976
General and administrative	2,102	2,345
Depreciation and amortization	245	303
Total costs and expenses	25,413	24,207
Operating income	7,004	5,572
Capital Expenditures	642
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(23,513)	(25,558)
Transportation costs	$ (23,513)	$ (25,558)

Schedule of Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 1,643,270	$ 1,670,941
Goodwill	348,161	348,661
Operating Segments [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Total assets	1,444,239	1,470,792
Goodwill	318,772	319,272
Operating Segments [Member] \| Mode LLC [Member]
Segment Reporting Information [Line Items]
Total assets	205,070	210,088
Goodwill	29,389	29,389
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Total assets	$ (6,039)	$ (9,939)

Summary of Revenue by Segment and Business Line (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 1,095,971	$ 892,756
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	600,998	531,367
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	220,382	183,961
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	214,211	177,428
Dedicated [Member]
Segment Reporting Information [Line Items]
Revenue	60,380
Operating Segments [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	831,585	676,480
Operating Segments [Member] \| Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	287,899	241,834
Operating Segments [Member] \| Intermodal [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	482,495	424,423
Operating Segments [Member] \| Intermodal [Member] \| Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	129,773	122,181
Operating Segments [Member] \| Truck brokerage [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	120,019	106,185
Operating Segments [Member] \| Truck brokerage [Member] \| Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	100,721	78,161
Operating Segments [Member] \| Logistics [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	168,676	145,872
Operating Segments [Member] \| Logistics [Member] \| Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	57,405	41,492
Operating Segments [Member] \| Dedicated [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	60,395
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(23,513)	(25,558)
Intersegment Elims [Member] \| Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(11,270)	(15,237)
Intersegment Elims [Member] \| Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(358)	(385)
Intersegment Elims [Member] \| Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	(11,870)	$ (9,936)
Intersegment Elims [Member] \| Dedicated [Member]
Segment Reporting Information [Line Items]
Revenue	$ (15)

Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 16,167	$ 10,334
Weighted average shares outstanding - basic	33,375	33,205
Dilutive effect of stock options and restricted stock	103	168
Weighted average shares outstanding - diluted	33,478	33,373
Earnings per common share - basic	$ 0.48	$ 0.31
Earnings per common share - diluted	$ 0.48	$ 0.31

Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value of fixed-rate borrowings less than historical carrying value	$ 3.5	$ 2.4
Fixed-rate borrowings, carrying value	244.6	247.1
Restricted investments	$ 23.3	$ 24.2

Long-Term Debt and Financing Arrangements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Revolving Line of Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 350,000,000
Line of credit outstanding	30,000,000	$ 45,000,000
Revolving Line of Credit Facility [Member] \| Bank Revolving Line of Credit [Member]
Line Of Credit Facility [Line Items]
Unused and available borrowings under bank revolving line of credit	$ 298,800,000	$ 284,900,000
Standby Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Letters of credit expiration year	2018
Outstanding letters of credit	$ 21,200,000

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Revolving line of credit & Secured long-term debt	$ 274,557	$ 292,074
Less current portion	(80,004)	(77,266)
Total long-term debt	194,553	214,808
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Revolving line of credit	30,000	45,000
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	13,119	13,586
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	52,186	36,981
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	28,709	30,301
Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Secured long-term debt	70,999	76,885
Secured Equipment Notes due in 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	46,777	50,737
Secured Equipment Notes due in 2019 [Member]
Debt Instrument [Line Items]
Secured long-term debt	30,748	36,178
Secured Equipment Notes due in 2018 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 2,019	$ 2,406

Schedule of Outstanding Debt (Parenthetical) (Detail)	3 Months Ended
Schedule of Outstanding Debt (Parenthetical) (Detail)	Mar. 31, 2018 USD ($)
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2024
Payment Frequency	monthly
Secured Equipment Notes due in 2024 [Member] \| Commencing on 2017 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2017
Secured Equipment Notes due in 2024 [Member] \| Commencing on 2018 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2018
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2023
Payment Frequency	monthly
Secured Equipment Notes due in 2023 [Member] \| Commencing on 2017 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2017
Secured Equipment Notes due in 2023 [Member] \| Commencing on 2018 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2018
Secured Equipment Notes due in 2023 [Member] \| Commencing on 2016 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2016
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2022
Payment Frequency	monthly
Secured Equipment Notes due in 2022 [Member] \| Commencing on 2017 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2017
Secured Equipment Notes due in 2022 [Member] \| Commencing on 2015 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2015
Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2021
Payment Frequency	monthly
Secured Equipment Notes due in 2021 [Member] \| Commencing on 2017 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2017
Secured Equipment Notes due in 2021 [Member] \| Commencing on 2014 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2014
Secured Equipment Notes due in 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2020
Payment Frequency	monthly
Secured Equipment Notes due in 2020 [Member] \| Commencing on 2016 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2016
Secured Equipment Notes due in 2020 [Member] \| Commencing on 2013 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2013
Secured Equipment Notes due in 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2019
Payment Frequency	monthly
Secured Equipment Notes due in 2019 [Member] \| Commencing on 2015 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2015
Secured Equipment Notes due in 2019 [Member] \| Commencing on 2013 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2013
Secured Equipment Notes due in 2018 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2018
Payment Frequency	monthly
Secured Equipment Notes due in 2018 [Member] \| Commencing on 2014 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2014
Secured Equipment Notes due in 2018 [Member] \| Commencing on 2013 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2013
Minimum [Member] \| Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 403
Interest rate secured debt	2.85%
Minimum [Member] \| Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 669
Interest rate secured debt	2.23%
Minimum [Member] \| Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 3,030
Interest rate secured debt	2.16%
Minimum [Member] \| Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 1,940
Interest rate secured debt	2.04%
Minimum [Member] \| Secured Equipment Notes due in 2020 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 6,175
Interest rate secured debt	1.72%
Minimum [Member] \| Secured Equipment Notes due in 2019 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 1,594
Interest rate secured debt	1.87%
Minimum [Member] \| Secured Equipment Notes due in 2018 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 6,480
Interest rate secured debt	2.05%
Maximum [Member] \| Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 83,000
Interest rate secured debt	3.41%
Maximum [Member] \| Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 187,963
Interest rate secured debt	3.66%
Maximum [Member] \| Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 254,190
Interest rate secured debt	2.87%
Maximum [Member] \| Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 326,333
Interest rate secured debt	2.96%
Maximum [Member] \| Secured Equipment Notes due in 2020 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 398,496
Interest rate secured debt	2.78%
Maximum [Member] \| Secured Equipment Notes due in 2019 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 325,050
Interest rate secured debt	2.62%
Maximum [Member] \| Secured Equipment Notes due in 2018 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 163,428
Interest rate secured debt	2.70%

Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2016 Container	Mar. 31, 2018 USD ($) Tractor Trailer Container	Apr. 30, 2018 Tractor Trailer
Loss Contingencies [Line Items]
Purchase contract units, containers \| Container	4,000
Number of containers received \| Container		2,947
Number of containers expected to be received in remainder of fiscal year \| Container		1,053
Purchase contract units tractors \| Tractor		787
Cost of purchasing tractors \| $		$ 98.5
Number of tractors expected to be received in remainder of fiscal year \| Tractor		733
Purchase contract units trailers \| Trailer		535
Cost of purchasing trailers \| $		$ 16.9
Number of trailers expected to be received in remainder of fiscal year \| Trailer		525
Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of tractors received \| Tractor			54
Number of trailers received \| Trailer			10

Legal Matters - Additional Information (Detail) - Robles Lawsuits [Member]			12 Months Ended
	Aug. 05, 2015 Plaintiff Employee	May 15, 2015 Plaintiff	Dec. 31, 2017
Loss Contingencies [Line Items]
Percentage of California drivers who accepted settlement offers			96.00%
Number of plaintiffs		2
Number of plaintiffs against HGT	63
Number of claims signed settlement agreements	58
Hub And HGT [Member]
Loss Contingencies [Line Items]
Number of employees filed lawsuit \| Employee	5

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018
Income Taxes [Line Items]
Provision for income taxes decreased	$ 4,829	$ 6,069
Effective income tax rate	23.00%	37.00%
Scenario, Plan [Member] \| Minimum [Member]
Income Taxes [Line Items]
Effective income tax rate			24.50%
Scenario, Plan [Member] \| Maximum [Member]
Income Taxes [Line Items]
Effective income tax rate			25.50%