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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance $ 5,945 $ 6,350 $ 5,395 $ 5,706
Provision 2,202 1,503 4,124 3,240
Claims paid/costs incurred (2,178) (1,681) (3,550) (2,774)
Ending balance $ 5,969 $ 6,172 $ 5,969 $ 6,172