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Commitments and Contingencies - Schedule of Warranty Reserves (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
Movement in Standard Product Warranty Accrual [Roll Forward]        
Warranty reserves, beginning of period $ 3,636 $ 1,575 $ 3,338 $ 1,593
Warranty reserves accrued 873 621 1,600 728
Warranty expenditures (480) (257) (909) (382)
Warranty reserves, end of period $ 4,029 $ 1,939 $ 4,029 $ 1,939