Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 7	$ 292
Additions (Reductions) Charged to Cost and Expenses	5	(3)	(362)
Other	0	0	0
Deductions	(5)	(4)	77
Balance at End of Period	0		7
Warranty Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	40,812	28,987	16,345
Additions (Reductions) Charged to Cost and Expenses	3,774	20,000	21,487
Other	0	0	0
Deductions	(10,745)	(8,175)	(8,845)
Balance at End of Period	33,841	40,812	28,987
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	4,201	24,131	24,199
Additions (Reductions) Charged to Cost and Expenses	388		(68)
Other	0	0	0
Deductions	(124)	(19,930)
Balance at End of Period	$ 4,465	$ 4,201	$ 24,131

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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