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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accrued Liabilities [Line Items]        
Initial warranty accrual, beginning balance $ 1,518 $ 1,980 $ 1,699 $ 2,218
Provision for estimated warranty cost 69 337 429 711
Warranty expenditures (257) (387) (798) (999)
Initial warranty accrual, ending balance 1,330 1,930 1,330 1,930
Total warranty accrual, long term            
Total warranty accrual, current portion $ 1,330 $ 1,930 $ 1,330 $ 1,930