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Basis of Presentation and Consolidation - Summary of Activity in Product Warranty Liabilities (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Reserve at beginning of year $ 12,431 $ 12,093
Additions 8,070 9,523
Payments (8,586) (9,492)
Reserve at period end $ 11,915 $ 12,124