Activity in Warranty Accrual for Standard Product Warranty (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Product Liability Contingency [Line Items]
Balance, beginning of the year	$ 236,131,000	$ 271,594,000	$ 269,218,000
Provision	174,850,000	120,296,000	145,517,000
Amounts charged to the accrual	(156,427,000)	(155,759,000)	(143,141,000)
Balance, end of the year	$ 254,554,000	$ 236,131,000	$ 271,594,000