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Total costs related to services rendered by an entity during the reporting period.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Topic 230

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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-Publisher FASB

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-Topic 350

-SubTopic 30

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-Paragraph 3

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The net result for the period of deducting operating expenses from operating revenues.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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-Publisher FASB

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The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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-Glossary Investing Activities

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Primarily represents commissions incurred in the period based upon the sale by commissioned employees or third parties of the entity's goods or services, and fees for sales assistance or product enhancements performed by third parties (such as a distributor or value added reseller).

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Summary of Operating Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 915,361us-gaap_SalesRevenueServicesNet	$ 913,386us-gaap_SalesRevenueServicesNet	$ 893,930us-gaap_SalesRevenueServicesNet	$ 848,449us-gaap_SalesRevenueServicesNet	$ 885,252us-gaap_SalesRevenueServicesNet	$ 882,981us-gaap_SalesRevenueServicesNet	$ 836,685us-gaap_SalesRevenueServicesNet	$ 768,980us-gaap_SalesRevenueServicesNet	$ 3,571,126us-gaap_SalesRevenueServicesNet	$ 3,373,898us-gaap_SalesRevenueServicesNet	$ 3,124,108us-gaap_SalesRevenueServicesNet
Transportation costs									3,200,691us-gaap_CostOfServices	3,002,875us-gaap_CostOfServices	2,768,042us-gaap_CostOfServices
Gross margin	89,910us-gaap_GrossProfit	93,196us-gaap_GrossProfit	98,585us-gaap_GrossProfit	88,744us-gaap_GrossProfit	95,088us-gaap_GrossProfit	93,124us-gaap_GrossProfit	95,473us-gaap_GrossProfit	87,338us-gaap_GrossProfit	370,435us-gaap_GrossProfit	371,023us-gaap_GrossProfit	356,066us-gaap_GrossProfit
Costs and expenses:
Salaries and benefits									136,480us-gaap_LaborAndRelatedExpense	135,341us-gaap_LaborAndRelatedExpense	129,143us-gaap_LaborAndRelatedExpense
Agent fees and commissions									62,041us-gaap_SalesCommissionsAndFees	55,789us-gaap_SalesCommissionsAndFees	55,112us-gaap_SalesCommissionsAndFees
General and administrative									58,014	56,772	52,832
Depreciation and amortization									7,799us-gaap_DepreciationAndAmortization	6,470us-gaap_DepreciationAndAmortization	6,619us-gaap_DepreciationAndAmortization
Driver settlements and related costs									10,343
Impairment of software		11,900us-gaap_OtherAssetImpairmentCharges							11,881us-gaap_OtherAssetImpairmentCharges
Impairment of trade name					2,904					2,904
Total costs and expenses									286,558us-gaap_OperatingExpenses	257,276us-gaap_OperatingExpenses	243,706us-gaap_OperatingExpenses
Operating income	24,777us-gaap_OperatingIncomeLoss	7,677us-gaap_OperatingIncomeLoss	30,927us-gaap_OperatingIncomeLoss	20,496us-gaap_OperatingIncomeLoss	27,251us-gaap_OperatingIncomeLoss	31,295us-gaap_OperatingIncomeLoss	30,464us-gaap_OperatingIncomeLoss	24,737us-gaap_OperatingIncomeLoss	83,877us-gaap_OperatingIncomeLoss	113,747us-gaap_OperatingIncomeLoss	112,360us-gaap_OperatingIncomeLoss
Capital expenditures									119,171	110,917	56,882
Operating Segments [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue									2,722,799	2,599,763	2,392,289
Transportation costs									2,461,144	2,325,512	2,128,942
Gross margin									261,655	274,251	263,347
Costs and expenses:
Salaries and benefits									122,097	120,478	113,855
Agent fees and commissions									45	1,372	1,900
General and administrative									51,108	50,484	45,411
Depreciation and amortization									6,238	4,326	4,448
Driver settlements and related costs									10,343
Impairment of software									11,881
Impairment of trade name										2,904
Total costs and expenses									201,712	179,564	165,614
Operating income									59,943	94,687	97,733
Capital expenditures									118,640	109,412	54,266
Operating Segments [Member] \| Mode [Member]
Segment Reporting Information [Line Items]
Revenue									931,131	823,159	779,928
Transportation costs									822,351	726,387	687,209
Gross margin									108,780	96,772	92,719
Costs and expenses:
Salaries and benefits									14,383	14,863	15,288
Agent fees and commissions									61,996	54,417	53,212
General and administrative									6,906	6,288	7,421
Depreciation and amortization									1,561	2,144	2,171
Total costs and expenses									84,846	77,712	78,092
Operating income									23,934	19,060	14,627
Capital expenditures									531	1,505	2,616
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue									(82,804)	(49,024)	(48,109)
Transportation costs									$ (82,804)	$ (49,024)	$ (48,109)