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Activity in Warranty Accrual for Product Warranty (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Balance, beginning of the period	$ 254,554,000	$ 236,131,000
Provision	48,253,000	45,825,000
Amounts charged to the accrual	(39,626,000)	(38,322,000)
Balance, end of the period	$ 263,181,000	$ 243,634,000

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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