Inventories (Components Of Inventories) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventories [Line Items]
Raw material	$ 42,406	$ 45,795
Work in process	373	872
Deferred costs of long-term contracts	304	220
Finished goods	89,428	101,111
Inventories, gross	132,511	147,998
Inventory reserves	(15,822)	(14,710)
Inventories, net	$ 116,689	$ 133,288