Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (243,561)	$ (96,460)
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	14,197	(5,168)
Change in unrecognized gains (losses) on derivative instruments:
Change in fair value of derivatives	(13,453)	17,515
Tax benefit (provision)	1,764	(4,359)
Change in unrecognized gains (losses) on derivative instruments, net of tax	(11,689)	13,156
Defined benefit pension plan:
Actuarial losses on pension obligation, net of amortization	(1,876)	(4,086)
Tax benefit		1,515
Pension changes, net of tax	(1,876)	(2,571)
Other comprehensive income, net of tax	632	5,417
Comprehensive loss	$ (242,929)	$ (91,043)