Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Line Items]
Raw materials and component parts	$ 158,381	$ 155,577
Work-in-process	35,985	40,506
Finished goods	60,131	58,175
Total	$ 254,497	$ 254,258