Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 97,502	$ 85,670
Work in progress	124,176	119,929
Finished goods	220,575	195,971
Inventory, gross, Total	442,253	401,570
Less: allowance for obsolete and excess inventory	(34,337)	(33,216)
Total inventory	$ 407,916	$ 368,354