Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 31, 2012
Inventories [Line Items]
Raw material	$ 30,972	$ 31,350
Work in process	718	921
Deferred costs of long-term contracts	631	604
Finished goods	97,915	104,137
Inventories, gross	130,236	137,012
Inventory reserves	(13,819)	(13,655)
Inventories, net	$ 116,417	$ 123,357