Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 7	$ 292	$ 335
Additions (Reductions) Charged to Cost and Expenses	(3)	(362)	23
Other
Deductions	(4)	77	(66)
Balance at End of Period		7	292
Warranty Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	28,987	16,345	14,472
Additions (Reductions) Charged to Cost and Expenses	20,000	21,487	9,976
Other
Deductions	(8,175)	(8,845)	(8,103)
Balance at End of Period	40,812	28,987	16,345
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	24,131	24,199	21,090
Additions (Reductions) Charged to Cost and Expenses		(68)	3,109
Other
Deductions	(19,930)
Balance at End of Period	$ 4,201	$ 24,131	$ 24,199