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 |