Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 359,910	$ 191,719	$ 964,834	$ 498,689
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of income tax (benefit) expense of ($1,592) and $4,200 for the three months ended September 30, 2021 and 2020 and ($4,764) and $226 for the nine months ended September 30, 2021 and 2020	(16,908)	17,429	(23,946)	(5,010)
Other comprehensive (loss) income	(16,908)	17,429	(23,946)	(5,010)
Comprehensive income	343,002	209,148	940,888	493,679
Less comprehensive income (loss) attributable to the noncontrolling interest	668	(36)	1,275	253
Comprehensive income attributable to shareholders	$ 342,334	$ 209,184	$ 939,613	$ 493,426