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Accrued Warranty Costs - Changes in Product Warranty Obligation (Accrued Warranty Costs) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure Accrued Product Warranty Costs [Abstract]      
Balance at beginning of year $ 8,817 $ 7,297 $ 6,172
Amounts charged to SG&A 9,678 7,923 7,388
Costs incurred (7,944) (6,403) (6,263)
Balance at end of year $ 10,551 $ 8,817 $ 7,297