Business Segment Information - Financial Information Regarding Company's Operations by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 1,491,645		$ 1,413,208
Net revenues	464,586	[1]	448,007	[1]
Operating income	135,203		128,518
Identifiable assets at period end	2,925,504		3,017,799		3,014,812
Capital expenditures	8,760		10,068
Depreciation and amortization	12,382		11,278
Equity	1,960,014		2,104,621		2,086,331	2,032,570
United States Segment
Segment Reporting Information [Line Items]
Total revenues	400,739		374,374
Net revenues	192,082	[1]	180,343	[1]
Operating income	51,898		47,353
Identifiable assets at period end	1,437,768		1,502,795
Capital expenditures	3,928		5,379
Depreciation and amortization	7,852		6,757
Equity	1,151,455		1,231,424
Other North America Segment
Segment Reporting Information [Line Items]
Total revenues	51,584		51,729
Net revenues	26,161	[1]	23,781	[1]
Operating income	8,375		6,612
Identifiable assets at period end	105,070		96,555
Capital expenditures	264		187
Depreciation and amortization	280		207
Equity	69,702		62,267
Latin America Segment
Segment Reporting Information [Line Items]
Total revenues	20,629		19,864
Net revenues	15,357	[1]	14,411	[1]
Operating income	4,859		4,089
Identifiable assets at period end	61,503		53,935
Capital expenditures	301		259
Depreciation and amortization	212		241
Equity	32,017		32,638
Asia Pacific Segment
Segment Reporting Information [Line Items]
Total revenues	714,384		694,137
Net revenues	133,274	[1]	135,550	[1]
Operating income	52,841		52,884
Identifiable assets at period end	697,614		795,946
Capital expenditures	3,126		2,552
Depreciation and amortization	2,108		1,988
Equity	448,196		568,609
Europe And Africa Segment
Segment Reporting Information [Line Items]
Total revenues	227,508		202,513
Net revenues	73,057	[1]	70,614	[1]
Operating income	11,066		11,926
Identifiable assets at period end	457,614		406,801
Capital expenditures	852		1,198
Depreciation and amortization	1,492		1,629
Equity	205,060		165,014
Middle East And India Segment
Segment Reporting Information [Line Items]
Total revenues	76,801		70,591
Net revenues	24,655	[1]	23,308	[1]
Operating income	6,164		5,654
Identifiable assets at period end	162,249		158,569
Capital expenditures	289		493
Depreciation and amortization	438		456
Equity	89,068		79,434
Operating Segments | United States Segment
Segment Reporting Information [Line Items]
Total revenues	420,750		394,400
Operating Segments | Other North America Segment
Segment Reporting Information [Line Items]
Total revenues	53,959		54,273
Operating Segments | Latin America Segment
Segment Reporting Information [Line Items]
Total revenues	25,833		24,740
Operating Segments | Asia Pacific Segment
Segment Reporting Information [Line Items]
Total revenues	726,393		704,767
Operating Segments | Europe And Africa Segment
Segment Reporting Information [Line Items]
Total revenues	236,465		211,393
Operating Segments | Middle East And India Segment
Segment Reporting Information [Line Items]
Total revenues	81,663		74,918
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(53,418)		(51,283)
Identifiable assets at period end	3,686		3,198
Equity	(35,484)		(34,765)
Intersegment Eliminations | United States Segment
Segment Reporting Information [Line Items]
Total revenues	(20,011)		(20,026)
Intersegment Eliminations | Other North America Segment
Segment Reporting Information [Line Items]
Total revenues	(2,375)		(2,544)
Intersegment Eliminations | Latin America Segment
Segment Reporting Information [Line Items]
Total revenues	(5,204)		(4,876)
Intersegment Eliminations | Asia Pacific Segment
Segment Reporting Information [Line Items]
Total revenues	(12,009)		(10,630)
Intersegment Eliminations | Europe And Africa Segment
Segment Reporting Information [Line Items]
Total revenues	(8,957)		(8,880)
Intersegment Eliminations | Middle East And India Segment
Segment Reporting Information [Line Items]
Total revenues	$ (4,862)		$ (4,327)

[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.