Inventories, net - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 78,934	$ 85,684
Work in progress	71,614	81,645
Finished goods	230,497	233,732
Inventory, gross, total	381,045	401,061
Less: allowance for obsolete and excess inventory	(83,828)	(45,648)
Net inventory	$ 297,217	$ 355,413