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Accrued Warranty Costs - Changes in Product Warranty Obligation (Accrued Warranty Costs) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disclosure Accrued Product Warranty Costs [Abstract]        
Balance at beginning of period $ 9,596 $ 7,701 $ 8,817 $ 7,297
Amounts charged to SG&A 2,372 1,926 6,892 5,621
Costs incurred (1,839) (1,458) (5,580) (4,749)
Balance at end of period $ 10,129 $ 8,169 $ 10,129 $ 8,169