Income taxes - Components of provision for income taxes from continuing operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 11,148	$ 19,374	$ (1,525)
State	9,644	8,220	1,432
Non-U.S.	35,042	23,690	29,353
Deferred:
Federal	(9,475)	(2,041)	(5,124)
State	(13,734)	(28,277)	(5,114)
Non-U.S.	(10,694)	(143,044)	4,174
Provision for income taxes from continuing operations	$ 21,931	$ (122,078)	$ 23,196