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Reconciliation of Changes in Warranty Liability (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Product Warranty [Roll Forward]
Balance, beginning of the year	$ 3,693	$ 3,765
Balance, end of the year	$ 3,693	$ 3,765

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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