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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Guarantees [Abstract]    
Warranty policy term 2 years  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Beginning balance $ 5,706 $ 5,607
Provision 1,737 1,803
Claims paid/costs incurred (1,093) (1,002)
Ending balance $ 6,350 $ 6,408