Restructuring - Summary of Activity of Restructuring (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 24,238	$ 34,475
Expense	35,137	46,031	$ 53,844
Cash payments	(39,550)	(56,099)
Foreign exchange translation and other	2,510	(169)
Restructuring Reserve, Ending Balance	22,335	24,238	34,475
Employee separation costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	21,927	32,707
Expense	16,245	18,017
Cash payments	(25,077)	(28,665)
Foreign exchange translation and other	1,996	(132)
Restructuring Reserve, Ending Balance	15,091	21,927	32,707
Other exit costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	2,311	1,768
Expense	18,892	28,014
Cash payments	(14,473)	(27,434)
Foreign exchange translation and other	514	(37)
Restructuring Reserve, Ending Balance	$ 7,244	$ 2,311	$ 1,768