Major Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Line Items]
Raw materials and purchased components	$ 69,771	$ 61,296
Service parts, garments and accessories	80,760	77,437
Finished goods	180,733	175,252
Less: reserves	(17,222)	(15,943)
Inventories	$ 314,042	$ 298,042