Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 38,906	$ 27,132	$ 119,252	$ 116,457
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	12,492	(8,903)	2,280	(7,278)
Total comprehensive income	$ 51,398	$ 18,229	$ 121,532	$ 109,179