Restructuring - Summary of Activity of Restructuring (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			$ 22,335
Restructuring	$ 10,013	$ 8,323	17,138	$ 18,311
Cash payments			(25,280)
Foreign exchange translation and other			(553)
Restructuring Reserve, Ending Balance	13,640		13,640
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			15,091
Restructuring			11,962
Cash payments			(16,623)
Foreign exchange translation and other			(467)
Restructuring Reserve, Ending Balance	9,963		9,963
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			7,244
Restructuring			5,176
Cash payments			(8,657)
Foreign exchange translation and other			(86)
Restructuring Reserve, Ending Balance	$ 3,677		$ 3,677