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Geographical Data for Operations (Parenthetical) (Detail) (USD $) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Real Goods Solar
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Other non-current assets | $ 24,481 | $ 29,994 | $ 29,427 |
Reduction in net deferred tax assets due to restatement |  |  |  | $ 364,000

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