Business Segment Information - Net Revenues Calculation (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Revenues Calculation [Line Items]
Total revenues		$ 1,691,553	$ 1,599,141	$ 3,369,079	$ 3,090,786
Airfreight services		506,988	503,213	1,019,989	986,095
Ocean freight and ocean services		433,356	423,716	878,812	791,091
Customs brokerage and other services		199,068	187,498	388,651	364,300
Net revenues	[1]	$ 552,141	$ 484,714	$ 1,081,627	$ 949,300

[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.