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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision at the statutory rate	$ 119,983	$ 120,180	$ 96,110
Increases (decreases) resulting from —
Valuation allowance on deferred tax assets	(31,138)	35,761	48,862
State taxes	31,791	23,399	18,504
Employee per diems, meals and entertainment	10,680	13,817	11,949
Foreign taxes	(9,641)	(21,565)	(2,621)
Contingency reserves, net	(2,125)	(3,173)	(2,619)
Stock-based compensation	(3,109)	(1,863)	(1,449)
Taxes on unincorporated joint ventures	(1,093)	(930)	(578)
Tax Cuts and Jobs Act	0	0	(6,295)
Entity restructuring and recapitalization efforts	0	0	(4,424)
Other	4,039	(154)	4,220
Total provision for income taxes	$ 119,387	$ 165,472	$ 161,659

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