Restructuring - Summary of Activity of Restructuring (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			$ 24,238
Restructuring	$ 9,909	$ 10,430	28,220	$ 33,468
Cash payments			(34,035)
Foreign exchange translation and other			2,219
Restructuring Reserve, Ending Balance	20,642		20,642
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			21,927
Restructuring			14,991
Cash payments			(22,224)
Foreign exchange translation and other			1,769
Restructuring Reserve, Ending Balance	16,463		16,463
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			2,311
Restructuring			13,229
Cash payments			(11,811)
Foreign exchange translation and other			450
Restructuring Reserve, Ending Balance	$ 4,179		$ 4,179