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Product Warranties - Summary of Changes in Product Warranties Reserve (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Movement In Standard And Extended Product Warranty Increase Decrease Roll Forward        
Warranty reserve, beginning of period $ 85,874 $ 97,190 $ 94,060 $ 101,507
Provision 12,674 12,103 32,899 35,556
Payments (12,617) (14,981) (41,028) (42,751)
Warranty reserve, end of period $ 85,931 $ 94,312 $ 85,931 $ 94,312