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Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Product Warranty Liability [Line Items]      
Balance at beginning of period $ 7,203 $ 6,925 $ 8,942
Acquisition     409
Accruals for warranties issued during the period 14,223 14,291 11,539
Accruals related to pre-existing warranties (379) (1,354) (3,159)
Settlements made during the period (12,847) (12,659) (10,806)
Balance at end of period $ 8,200 $ 7,203 $ 6,925