Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Warranty Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 33,522	$ 33,841	$ 40,812
Additions (Reductions) Charged to Cost and Expenses	10,852	8,515	3,774
Deductions	(6,682)	(8,834)	(10,745)
Balance at End of Period	37,692	33,522	33,841
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	4,582	4,465	4,201
Additions (Reductions) Charged to Cost and Expenses		117	388
Deductions	(521)		(124)
Balance at End of Period	$ 4,061	$ 4,582	$ 4,465