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Accrued Expenses - Activity in Warranty Accrual for Product Warranty (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of the period	$ 254,554	$ 236,131	$ 271,594
Provision	181,898	174,850	120,296
Amounts charged to the accrual	(158,590)	(156,427)	(155,759)
Balance, end of the period	$ 277,862	$ 254,554	$ 236,131

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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