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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance $ 10,783 $ 7,311 $ 7,610 $ 6,657
Provision 2,127 3,157 4,606 5,523
Standard Product Warranty Accrual, Additions from Business Acquisition 273 0 2,600 0
Claims paid/costs incurred (2,207) (2,433) (3,840) (4,145)
Ending balance $ 10,976 $ 8,035 $ 10,976 $ 8,035