Business Segment Information - Financial Information Regarding Company's Operations by Geographic Area (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Revenues		$ 2,651,885	$ 2,439,001	$ 5,318,304	$ 4,645,679
Directly related cost of transportation and other expenses	[1]	1,753,357	1,639,408	3,530,032	3,072,688
Salaries and related costs		471,336	426,431	929,273	839,593
Other operating expenses	[2]	179,456	149,243	345,405	294,703
Operating income		247,736	223,919	513,594	438,695
Identifiable assets at period end		4,786,481	4,788,341	4,786,481	4,788,341	$ 4,754,458
Capital expenditures		15,875	7,943	29,027	18,124
Depreciation and amortization		13,847	14,979	28,451	30,140
Equity		2,197,283	2,178,427	2,197,283	2,178,427	$ 2,225,784
Operating Segments | United States Segment
Segment Reporting Information [Line Items]
Revenues		877,325	779,170	1,731,774	1,530,713
Directly related cost of transportation and other expenses	[1]	454,354	423,102	906,271	827,051
Salaries and related costs		266,018	238,974	524,107	472,287
Other operating expenses	[2]	31,859	24,701	54,407	47,096
Operating income		125,094	92,393	246,989	184,279
Identifiable assets at period end		2,554,090	2,566,053	2,554,090	2,566,053
Capital expenditures		6,146	2,948	14,553	8,476
Depreciation and amortization		7,896	9,106	16,834	18,126
Equity		1,475,449	1,546,936	1,475,449	1,546,936
Operating Segments | Other North America Segment
Segment Reporting Information [Line Items]
Revenues		108,128	110,723	224,613	217,573
Directly related cost of transportation and other expenses	[1]	67,428	65,374	140,621	132,084
Salaries and related costs		20,205	19,976	39,797	38,882
Other operating expenses	[2]	16,726	14,363	31,554	28,541
Operating income		3,769	11,010	12,641	18,066
Identifiable assets at period end		186,248	173,764	186,248	173,764
Capital expenditures		257	575	483	1,974
Depreciation and amortization		499	535	996	1,032
Equity		57,602	32,700	57,602	32,700
Operating Segments | Latin America Segment
Segment Reporting Information [Line Items]
Revenues		66,904	45,314	129,293	89,806
Directly related cost of transportation and other expenses	[1]	40,945	24,640	77,380	49,104
Salaries and related costs		11,030	8,860	21,468	17,707
Other operating expenses	[2]	9,745	5,691	19,659	13,608
Operating income		5,184	6,123	10,786	9,387
Identifiable assets at period end		105,069	93,967	105,069	93,967
Capital expenditures		274	129	499	282
Depreciation and amortization		253	278	504	567
Equity		37,810	41,135	37,810	41,135
Operating Segments | North Asia Segment
Segment Reporting Information [Line Items]
Revenues		636,785	637,351	1,331,793	1,182,292
Directly related cost of transportation and other expenses	[1]	507,413	512,146	1,061,907	938,620
Salaries and related costs		36,686	35,955	77,047	70,897
Other operating expenses	[2]	36,820	34,807	74,566	67,125
Operating income		55,866	54,443	118,273	105,650
Identifiable assets at period end		523,858	626,892	523,858	626,892
Capital expenditures		4,545	355	5,050	637
Depreciation and amortization		1,176	1,098	2,232	2,191
Equity		192,012	163,913	192,012	163,913
Operating Segments | South Asia Segment
Segment Reporting Information [Line Items]
Revenues		359,531	287,943	724,108	515,662
Directly related cost of transportation and other expenses	[1]	277,355	223,238	558,850	387,262
Salaries and related costs		28,567	24,463	56,639	47,380
Other operating expenses	[2]	28,117	18,621	51,402	36,616
Operating income		25,492	21,621	57,217	44,404
Identifiable assets at period end		354,318	336,598	354,318	336,598
Capital expenditures		1,189	1,955	2,063	2,099
Depreciation and amortization		622	419	1,192	967
Equity		119,338	129,886	119,338	129,886
Operating Segments | Europe Segment
Segment Reporting Information [Line Items]
Revenues		449,712	409,455	872,507	807,772
Directly related cost of transportation and other expenses	[1]	293,878	262,451	565,594	516,970
Salaries and related costs		88,913	80,088	170,462	157,660
Other operating expenses	[2]	41,878	39,625	85,237	79,141
Operating income		25,043	27,291	51,214	54,001
Identifiable assets at period end		789,514	738,068	789,514	738,068
Capital expenditures		1,928	1,094	3,084	3,312
Depreciation and amortization		2,791	2,784	5,437	5,754
Equity		191,551	151,165	191,551	151,165
Operating Segments | Middle East Africa and India Segment
Segment Reporting Information [Line Items]
Revenues		155,458	170,349	308,330	304,455
Directly related cost of transportation and other expenses	[1]	113,243	128,949	222,091	222,741
Salaries and related costs		19,917	18,115	39,753	34,780
Other operating expenses	[2]	15,015	12,237	30,043	24,036
Operating income		7,283	11,048	16,443	22,898
Identifiable assets at period end		286,466	284,672	286,466	284,672
Capital expenditures		1,536	887	3,295	1,344
Depreciation and amortization		610	759	1,256	1,503
Equity		162,159	153,155	162,159	153,155
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		(1,958)	(1,304)	(4,114)	(2,594)
Directly related cost of transportation and other expenses	[1]	(1,259)	(492)	(2,682)	(1,144)
Other operating expenses	[2]	(704)	(802)	(1,463)	(1,460)
Operating income		5	(10)	31	10
Identifiable assets at period end		(13,082)	(31,673)	(13,082)	(31,673)
Equity		$ (38,638)	$ (40,463)	$ (38,638)	$ (40,463)

[1] Directly related cost of transportation and other expenses totals operating expenses from airfreight services, ocean freight and ocean services and customs brokerage and other services as shown in the condensed consolidated statements of earnings.

[2] Other operating expenses totals rent and occupancy, depreciation and amortization, selling and promotion and other as shown in the consolidated statements of earnings.