Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Warranty Reserve [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 34,999	$ 37,692	$ 33,522
Additions (Reductions) Charged to Cost and Expenses	1,104	4,268	10,852
Deductions	(5,349)	(6,961)	(6,682)
Balance at End of Period	30,754	34,999	37,692
Valuation Allowance of Deferred Tax Assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	3,096	4,061	4,582
Deductions	(81)	(965)	(521)
Balance at End of Period	$ 3,015	$ 3,096	$ 4,061