Warranty Accrual - Warranty Accrual Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Commitments And Contingencies Disclosure [Abstract]
Beginning Balance	$ 23,098	$ 25,076	$ 23,151	$ 25,525
Expense provisions	1,154	878	2,276	1,643
Cash payments	(1,527)	(1,918)	(3,002)	(3,132)
Adjustments			300
Ending Balance	$ 22,725	$ 24,036	$ 22,725	$ 24,036