Restructuring - Summary of Activity of Restructuring (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 26,995	$ 13,227
Expense	39,482	51,102	$ 29,722
Cash payments	(40,332)	(33,946)
Restructuring Reserve, Settled without Cash	(2,558)	(2,997)
Foreign exchange translation and other	(152)	(391)
Restructuring Reserve, Ending Balance	23,435	26,995	13,227
Employee separation costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	22,990	9,398
Expense	17,926	34,354
Cash payments	(25,261)	(20,661)
Restructuring Reserve, Settled without Cash	0	0
Foreign exchange translation and other	(626)	(101)
Restructuring Reserve, Ending Balance	15,029	22,990	9,398
Other exit costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	4,005	3,829
Expense	21,556	16,748
Cash payments	(15,071)	(13,285)
Restructuring Reserve, Settled without Cash	(2,558)	(2,997)
Foreign exchange translation and other	474	(290)
Restructuring Reserve, Ending Balance	$ 8,406	$ 4,005	$ 3,829