Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 91,514	$ 85,670
Work in progress	120,426	119,929
Finished goods	219,653	195,971
Inventory, gross, Total	431,593	401,570
Less: allowance for obsolete and excess inventory	(34,237)	(33,216)
Total inventory	$ 397,356	$ 368,354