Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 316,974	$ 184,188	$ 604,924	$ 306,970
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of income taxes expense (benefit) of $221 and $(5,148) for the three months ended June 30, 2021 and 2020 and $(3,172) and $(3,974) for the six months ended June 30, 2021 and 2020.	9,159	16,410	(7,038)	(22,439)
Other comprehensive income (loss)	9,159	16,410	(7,038)	(22,439)
Comprehensive income	326,133	200,598	597,886	284,531
Less comprehensive income attributable to the noncontrolling interest	341	141	607	289
Comprehensive income attributable to shareholders	$ 325,792	$ 200,457	$ 597,279	$ 284,242