Business Segment Information - Net Revenues Calculation (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting [Abstract]
Total revenues		$ 1,475,164	$ 1,691,553	$ 2,893,636	$ 3,369,079
Expenses [Abstract]
Airfreight services		403,419	506,988	792,196	1,019,989
Ocean freight and ocean services		323,699	433,356	646,719	878,812
Customs brokerage and other services		194,929	199,068	384,535	388,651
Net revenues	[1]	$ 553,117	$ 552,141	$ 1,070,186	$ 1,081,627

[1] Net revenues are a non-GAAP measure calculated as revenues less directly related operations expenses attributable to the Company's principal services. The Company's management believes that net revenues are a better measure than total revenues when evaluating the Company's operating segment performance since total revenues earned as a freight consolidator include the carriers' charges for carrying the shipment, whereas revenues earned in other capacities include primarily the commissions and fees earned by the Company. Net revenue is one of the Company's primary operational and financial measures and demonstrates the Company's ability to concentrate and leverage purchasing power through effective consolidation of shipments from customers utilizing a variety of transportation carriers and optimal routings.