Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 6,815,953	$ 4,803,869
Costs and expenses:
Personnel expenses	413,361	360,835
Other selling, general, and administrative expenses	147,361	118,216
Total costs and expenses	6,470,479	4,580,540
Income from operations	345,474	223,329
Interest and other income/expense, net	(14,174)	(11,260)
Income before provision for income taxes	331,300	212,069
Provision for income taxes	60,952	38,764
Net income	270,348	173,305
Other comprehensive income (loss), net of tax	6,870	(7,286)
Comprehensive income	$ 277,218	$ 166,019
Basic net income per share (in dollars per share)	$ 2.07	$ 1.29
Diluted net income per share (in dollars per share)	$ 2.05	$ 1.28
Basic weighted average shares outstanding (shares)	130,499	134,508
Dilutive effect of outstanding stock awards (shares)	1,656	1,237
Diluted weighted average shares outstanding (shares)	132,155	135,745
Transportation
Revenues:
Total revenues	$ 6,528,351	$ 4,560,227
Costs and expenses:
Purchased products and services	5,650,224	3,881,285
Sourcing
Revenues:
Total revenues	287,602	243,642
Costs and expenses:
Purchased products and services	$ 259,533	$ 220,204