Condensed Consolidated Statements of Comprehensive Income (Loss) - 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 income (loss)	$ 11,146	$ (6,631)	$ (222,154)	$ 2,589
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	16,384	(22,143)	(9,706)	(21,459)
Change in unrecognized gains (losses) on derivative instruments:
Change in fair value of derivatives	5,818	(10,406)	(32,934)	(1,862)
Tax (provision) benefit	(1,135)	2,104	7,618	342
Change in unrecognized gains (losses) on derivative instruments, net of tax	4,683	(8,302)	(25,316)	(1,520)
Defined benefit pension plan:
Amortization of actuarial losses on pension obligations	72	50	216	155
Tax (provision)	(15)	(11)	(45)	(33)
Pension changes, net of tax	57	39	171	122
Other comprehensive income (loss), net of tax	21,124	(30,406)	(34,851)	(22,857)
Comprehensive income (loss)	$ 32,270	$ (37,037)	$ (257,005)	$ (20,268)