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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance $ 7,311 $ 5,945 $ 6,657 $ 5,395
Provision 3,157 2,202 5,523 4,124
Claims paid/costs incurred (2,433) (2,178) (4,145) (3,550)
Ending balance $ 8,035 $ 5,969 $ 8,035 $ 5,969