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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance     $ 5,395 $ 5,706
Provision $ 4,371 $ 1,163 8,495 4,403
Claims paid/costs incurred (2,790) (1,820) (6,340) (4,594)
Ending balance $ 7,550 $ 5,515 $ 7,550 $ 5,515