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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Guarantees [Abstract]        
Warranty policy term     2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance $ 6,172 $ 6,447 $ 5,706 $ 5,607
Provision 1,163 1,052 4,403 4,321
Claims paid/costs incurred (1,820) (1,484) (4,594) (3,913)
Ending balance $ 5,515 $ 6,015 $ 5,515 $ 6,015