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, 2014
Mar. 31, 2013
Dec. 31, 2013
Accrued Liabilities [Line Items]      
Initial warranty accrual, beginning balance $ 1,096 $ 1,699  
Provision for estimated warranty cost 148 337  
Warranty expenditures (219) (281)  
Initial warranty accrual, ending balance 1,025 1,755  
Total warranty accrual, long-term        
Total warranty accrual, current portion $ 1,025 $ 1,755 $ 1,096