Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,090,947	$ 1,802,166	$ 5,902,768	$ 5,019,577
Operating Expenses:
Salaries and related costs	351,577	319,050	1,042,420	930,159
Rent and occupancy costs	38,202	30,533	113,186	87,826
Depreciation and amortization	13,335	12,272	40,833	36,241
Selling and promotion	10,632	10,608	32,385	32,476
Other	44,414	39,784	131,318	102,429
Total operating expenses	1,887,793	1,615,271	5,323,212	4,518,328
Operating income	203,154	186,895	579,556	501,249
Other Income (Expense):
Interest income	4,704	3,444	14,171	9,565
Other, net	566	96	2,357	2,584
Other income (expense), net	5,270	3,540	16,528	12,149
Earnings before income taxes	208,424	190,435	596,084	513,398
Income tax expense	45,357	69,829	155,871	190,470
Net earnings	163,067	120,606	440,213	322,928
Less net earnings attributable to the noncontrolling interest	375	343	1,224	550
Net earnings attributable to shareholders	$ 162,692	$ 120,263	$ 438,989	$ 322,378
Diluted earnings attributable to shareholders per share	$ 0.92	$ 0.66	$ 2.46	$ 1.77
Basic earnings attributable to shareholders per share	0.94	0.67	2.51	1.79
Dividends declared and paid per common share	$ 0.00	$ 0.00	$ 0.45	$ 0.42
Weighted average diluted shares outstanding	177,173	181,788	178,447	181,951
Weighted average basic shares outstanding	173,394	179,416	174,675	179,827
Airfreight services
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 833,338	$ 735,164	$ 2,366,326	$ 2,022,577
Operating Expenses:
Direct Operating Costs	620,554	547,595	1,727,383	1,490,417
Ocean freight and ocean services
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	585,810	563,386	1,636,701	1,585,730
Operating Expenses:
Direct Operating Costs	435,313	411,061	1,199,887	1,163,051
Customs brokerage and other services
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	671,799	503,616	1,899,741	1,411,270
Operating Expenses:
Direct Operating Costs	$ 373,766	$ 244,368	$ 1,035,800	$ 675,729