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Product Warranty Liability - Summary of Activity in Product Warranty Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Commitments And Contingencies Disclosure [Abstract]
Reserve at January 1	$ 30,139	$ 27,400
Additions	9,712	13,104
Payments	(9,323)	(10,134)
Reserve at June 30	$ 30,528	$ 30,370

- 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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