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Changes In Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accrued Liabilities [Line Items]
Initial warranty accrual, beginning balance	$ 1,699	$ 2,218
Provision for estimated warranty cost	650	122
Warranty expenditures	(594)	(414)
Initial warranty accrual, ending balance	1,755	1,926
Total warranty accrual, long term
Total warranty accrual, current portion	$ 1,755	$ 1,926

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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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

+ References+ Details