Inventories, net - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 79,164	$ 85,684
Work in progress	72,569	81,645
Finished goods	228,610	233,732
Inventory, gross, Total	380,343	401,061
Less: allowance for obsolete and excess inventory	(49,833)	(45,648)
Net inventory	$ 330,510	$ 355,413