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Warranty Reserves - Schedule of Warranty Reserves (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
Movement in Standard Product Warranty Accrual [Roll Forward]        
Warranty reserves, beginning of period $ 1,939 $ 991 $ 1,593 $ 985
Warranty reserves accrued 721 104 1,449 226
Warranty expenditures (244) (49) (626) (165)
Warranty reserves, end of period $ 2,416 $ 1,046 $ 2,416 $ 1,046