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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Movement In Standard And Extended Product Warranty Increase Decrease Roll Forward          
Initial warranty accrual, beginning balance $ 1,255 $ 1,518 $ 1,096 $ 1,699  
Provision for estimated warranty cost 310 69 919 429  
Warranty expenditures (199) (257) (649) (798)  
Initial warranty accrual, ending balance 1,366 1,330 1,366 1,330  
Less warranty accrual, long-term 367   367    
Total warranty accrual, current portion $ 999 $ 1,330 $ 999 $ 1,330 $ 1,096