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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Accrued Warranty Liabilities [Line Items]          
Initial warranty accrual, beginning balance $ 1,025 $ 1,755 $ 1,096 $ 1,699  
Provision for estimated warranty cost 461 23 609 360  
Warranty expenditures (231) (260) (450) (541)  
Initial warranty accrual, ending balance 1,255 1,518 1,255 1,518  
Less warranty accrual, long-term 247   247    
Total warranty accrual, current portion $ 1,008 $ 1,518 $ 1,008 $ 1,518 $ 1,096