Restructuring - Summary of Activity of Restructuring (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			$ 13,227
Restructuring charges	$ 5,572	$ 2,703	29,214	$ 19,841
Cash payments			(24,674)
Foreign exchange translation and other			(1,661)
Restructuring Reserve, Ending Balance	16,106		16,106
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			9,398
Restructuring charges			19,925
Cash payments			(15,858)
Foreign exchange translation and other			(438)
Restructuring Reserve, Ending Balance	13,027		13,027
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			3,829
Restructuring charges			9,289
Cash payments			(8,816)
Foreign exchange translation and other			(1,223)
Restructuring Reserve, Ending Balance	$ 3,079		$ 3,079