Consolidated Statements of Comprehensive Income (Loss) - 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 (loss) income	$ (13,648)	$ (10,223)	$ 712	$ (4,193)
Other comprehensive income (loss), net of tax:
Foreign currency translation (net of tax effect of $0 for all periods)	2,640	2,560	(1,335)	(5,018)
Retirement related benefit plans (net of tax effect of $0, $(13), $0 and $0, respectively)	84	31	227	168
Total other comprehensive income (loss)	2,724	2,591	(1,108)	(4,850)
Comprehensive loss	$ (10,924)	$ (7,632)	$ (396)	$ (9,043)