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Activity in Warranty Accrual for Product Warranty (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of the period	$ 262,059	$ 248,395	$ 254,554	$ 236,131
Provision	41,303	42,535	129,358	130,775
Amounts charged to the accrual	(38,545)	(41,955)	(119,095)	(117,931)
Balance, end of the period	$ 264,817	$ 248,975	$ 264,817	$ 248,975

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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