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Product Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Other Accrued Liabilities [Line Items]    
Balance as of January 1 $ 20,132 $ 20,520
Provision for warranties issued in current year 5,272 4,159
Supreme Acquisition 0 1,581
(Recovery of) Provision for pre-existing warranties 0 (225)
Payments (3,939) (4,928)
Balance as of September 30 $ 21,465 $ 21,107