Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw material	$ 31,335	$ 31,350
Work in process	415	921
Deferred costs of long-term contracts	294	604
Finished goods	101,540	104,137
Total inventories, gross	133,584	137,012
Inventory reserves	(12,561)	(13,655)
Total inventories, net	$ 121,023	$ 123,357