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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 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 2,366 1,922
Claims paid/costs incurred (1,712) (1,372)
Ending balance $ 7,311 $ 5,945