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Accrued Warranty Costs - Changes in Product Warranty Obligation (Accrued Warranty Costs) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Disclosure Accrued Product Warranty Costs [Abstract]        
Balance at beginning of period $ 9,034 $ 7,578 $ 8,817 $ 7,297
Amounts charged to SG&A 2,421 1,468 4,520 3,695
Costs incurred (1,859) (1,345) (3,741) (3,291)
Balance at end of period $ 9,596 $ 7,701 $ 9,596 $ 7,701