Quarterly report pursuant to Section 13 or 15(d)

Changes In Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties (Detail)

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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