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Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Warranty Reserve [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 25,494 $ 30,754 $ 34,999
Additions (Reductions) Charged to Cost and Expenses 9,861 979 1,104
Deductions (5,882) (6,239) (5,349)
Balance at End of Period 29,473 25,494 30,754
Valuation Allowance of Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 2,988 3,015 3,096
Additions (Reductions) Charged to Cost and Expenses 1    
Deductions (214) (27) (81)
Balance at End of Period $ 2,775 $ 2,988 $ 3,015