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Product Warranties - Summary of Changes in Product Warranties Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of changes in product warranties reserve:
Warranty reserve, beginning of period	$ 62,742	$ 64,008
Provision	8,291	6,415
Payments	(7,976)	(10,137)
Warranty reserve, end of period	$ 63,057	$ 60,286

- Definition

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.

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