Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Airfreight services	$ 2,877,032	$ 2,453,347	$ 2,740,583
Ocean freight and ocean services	2,107,045	1,917,494	2,194,004
Customs brokerage and other services	1,936,871	1,727,196	1,682,045
Total revenues	6,920,948	6,098,037	6,616,632
Operating Expenses:
Airfreight services	2,126,761	1,752,167	1,987,690
Ocean freight and ocean services	1,543,740	1,378,699	1,648,993
Customs brokerage and other services	931,258	803,135	792,172
Salaries and related costs	1,267,120	1,157,635	1,143,511
Rent and occupancy costs	119,732	108,812	102,470
Depreciation and amortization	49,310	46,796	46,012
Selling and promotion	44,290	41,763	41,990
Other	138,477	138,867	132,310
Total operating expenses	6,220,688	5,427,874	5,895,148
Operating income	700,260	670,163	721,484
Other Income (Expense):
Interest income	13,204	11,580	10,421
Other, net	5,131	5,113	4,784
Other income, net	18,335	16,693	15,205
Earnings before income taxes	718,595	686,856	736,689
Income tax expense	228,212	254,323	277,192
Net earnings	490,383	432,533	459,497
Less net earnings attributable to the noncontrolling interest	1,038	1,726	2,274
Net earnings attributable to shareholders	$ 489,345	$ 430,807	$ 457,223
Diluted earnings attributable to shareholders per share	$ 2.69	$ 2.36	$ 2.40
Basic earnings attributable to shareholders per share	$ 2.73	$ 2.38	$ 2.42
Weighted average diluted shares outstanding	181,666	182,704	190,223
Weighted average basic shares outstanding	179,247	181,282	188,941