Quarterly Financial Data Quarterly Financial Data Level 4 (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Data (Unaudited) [Abstract]
Revenue	$ 4,143,143	$ 3,511,509	$ 3,230,785
Costs of revenue	(2,839,529)	(2,534,682)	(2,470,205)
Gross profits	1,303,614	976,827	760,580
Operating income	1,190,676	842,770	666,613
Income from continuing operations before income taxes	1,045,500	662,060	464,432
Income Tax Expense (Benefit)	(242,248)	(145,923)	(94,661)
Net income	803,252	516,137	369,771
Net income attributable to noncontrolling interests	(313)	(230)	(175)
Net income attributable to common stockholders	$ 802,939	$ 515,907	$ 369,596
Basic — EPS	$ 4.79	$ 2.92	$ 2.03
Earnings per share, diluted	$ 4.72	$ 2.88	$ 1.99