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Equity Method Investment and Receivable from Investee - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 19, 2011 Real Goods Solar | Dec. 31, 2012 Real Goods Solar | Dec. 31, 2011 Real Goods Solar | Dec. 31, 2010 Real Goods Solar | Dec. 31, 2012 Real Goods Solar Riverside Renewable Energy Investments | Dec. 31, 2011 Real Goods Solar Class B Common Stock Vote | Dec. 31, 2012 Real Goods Solar Class A Common Stock | Dec. 31, 2011 Real Goods Solar Class A Common Stock Vote | Nov. 13, 2012 Real Goods Solar Scenario 1 | Dec. 31, 2012 Real Goods Solar Scenario 2
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share |  |  |  |  |  |  |  |  |  |  | 10 |  | 1 |  |
Voting ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 37.50% |  |
Loss from deconsolidation pretax |  |  | $ (4,550,000) | [1] |  |  |  | $ (4,550,000) |  |  |  |  |  |  |
After tax gain on adjustment to a deferred tax liability |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |
Loan advanced Real Goods Solar |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |
Percentage annual interest rate on advanced investment |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Maturity date of loan advanced |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2013 | Apr. 26, 2013
Additional loan to be advanced |  |  |  |  |  |  | 1,000,000 |  |  | 1,000,000 |  |  |  |  |
Additional loan to be advanced, end date |  |  |  |  |  |  | Mar. 31, 2013 |  |  |  |  |  |  |  |
Tenant improvements purchase price |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |
Noncash portion of net loss | (18,410,000) | [1] |  |  |  |  | 17,000,000 |  |  |  |  |  |  |  |
Goodwill, net deferred tax assets, and other asset impairment charges |  |  |  |  |  |  | 38,100,000 |  |  |  |  |  |  |  |
Valuation allowance for a deferred tax asset |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |
Interest received on loan |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |
Carrying values of equity method investment |  |  | 14,300,000 |  |  |  | 0 |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  | 6,000,000 | 7,100,000 |  |  |  |  |  |  |
Equity investment related transactions non cash loss |  |  |  |  |  |  | 12,400,000 |  |  |  |  |  |  |  |
Federal income tax rate | 34.00% |  | 34.00% |  | 34.00% |  | 34.00% |  |  |  |  |  |  |  |
Operating loss carryforwards beginning expiration year |  |  |  |  |  |  | 2018 |  |  |  |  |  |  |  |
Portion of net operating loss carryforwards |  |  |  |  |  |  | 4,400,000 |  |  |  |  |  |  |  |
Deferred tax asset related to Tax Sharing Agreement | 1,600,000 |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |
Lease agreement period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Monthly lease payments |  |  |  |  |  | 16,300 |  |  |  |  |  |  |  |  |
Lease rate per square foot agreed to cancel |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Owned Class A common stock |  |  |  |  |  |  |  |  | 54.60% |  |  | 37.50% |  |  |
Estimated fair value based on the closing market price of Class A common stock |  |  |  |  |  |  |  |  |  |  |  | 7,600,000 |  |  |
Equity in the net assets |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |
[1] | RSOL was deconsolidated and accounted for as an equity method investment effective December 31, 2011. Consequently, RSOL is reported as an equity method investment for the year ended December 31, 2012 and as a consolidated subsidiary for the years ended December 31, 2011 and 2010.

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