Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 95,441	$ 85,670
Work in progress	134,042	119,929
Finished goods	214,138	195,971
Inventory, gross, Total	443,621	401,570
Less: allowance for obsolete and excess inventory	(35,555)	(33,216)
Total inventory	$ 408,066	$ 368,354