Restructuring - Summary of Activity of Restructuring (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			$ 13,227
Restructuring charges	$ 5,927	$ 10,013	23,642	$ 17,138
Cash payments			(17,533)
Foreign exchange translation and other			(67)
Restructuring Reserve, Ending Balance	19,269		19,269
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			9,398
Restructuring charges			17,085
Cash payments			(11,013)
Foreign exchange translation and other			(82)
Restructuring Reserve, Ending Balance	15,388		15,388
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			3,829
Restructuring charges			6,557
Cash payments			(6,520)
Foreign exchange translation and other			15
Restructuring Reserve, Ending Balance	$ 3,881		$ 3,881