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Activity in Warranty Accrual for Product Warranty (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of the period	$ 277,862	$ 254,554
Provision	44,628	48,253
Amounts charged to the accrual	(39,917)	(39,626)
Balance, end of the period	$ 282,573	$ 263,181

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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