Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 102,029	$ 107,357
Work in progress	105,124	112,514
Finished goods	195,016	207,295
Inventory, gross, Total	402,169	427,166
Less: allowance for obsolete and excess inventory	(36,495)	(34,607)
Total inventory	$ 365,674	$ 392,559