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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Guarantees [Abstract]
Beginning balance	$ 8,241	$ 7,863	$ 7,539	$ 8,140
Provision	190	2,832	4,335	6,605
Claims paid/costs incurred	(1,665)	(2,562)	(5,108)	(6,612)
Ending balance	$ 6,766	$ 8,133	$ 6,766	$ 8,133

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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