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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance     $ 6,657 $ 5,395
Provision $ 3,110 $ 4,371 8,633 8,495
Claims paid/costs incurred (2,613) (2,790) (6,758) (6,340)
Ending balance $ 8,532 $ 7,550 $ 8,532 $ 7,550