Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Line Items]
Raw materials and component parts	$ 147,177	$ 155,577
Work-in-process	38,467	40,506
Finished goods	63,920	58,175
Total	$ 249,564	$ 254,258