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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance $ 10,976 $ 8,035 $ 7,610 $ 6,657
Provision 1,494 3,110 6,492 8,633
Standard Product Warranty Accrual, Additions from Business Acquisition 0 0 2,208 0
Claims paid/costs incurred (2,349) (2,613) (6,189) (6,758)
Ending balance $ 10,121 $ 8,532 $ 10,121 $ 8,532