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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |
Ownership percentage in a subsidiary | 51.40% |
Change in ownership of a company limiting period | 3 years |
Alternative minimum tax credit carryforwards | $ 500,000 |
General business tax credit carryforwards | 254,000 |
Foreign tax credit carryforwards | 164,000 |
Tax credit carryforward expiration year | 2018 |
Deferred tax asset related to Tax Sharing Agreement | 1,600,000 |
Tax write-offs recorded to additional paid-in capital as a result of the exercise of stock options |  | 13,000
Tax benefit recognized that has a likelihood of being realized upon ultimate resolution | 50.00% |
Maximum |  |
Income Taxes [Line Items] |  |
Ownership percentage in a subsidiary | 80.00% |
Minimum |  |
Income Taxes [Line Items] |  |
Change in ownership of a company limiting the net operating loss carryforward | 50.00% |
Foreign Tax Authority |  |
Income Taxes [Line Items] |  |
Undistributed foreign earnings for which provision for U.S. federal and state income taxes made | 600,000 |
State and Local Jurisdiction |  |
Income Taxes [Line Items] |  |
Tax effected net operating loss carryforwards | 15,800,000 |
Operating loss carryforwards, if unused, expiration year | 2018 |
Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Tax effected net operating loss carryforwards | 1,600,000 |
Operating loss carryforwards, if unused, expiration year | 2018 |
Real Goods Solar |  |
Income Taxes [Line Items] |  |
Income tax expense benefits | 6,000,000 | 7,100,000
Credit to additional paid-in capital |  | 600,000
Tax effected net operating loss carryforwards | 4,400,000 |
Deferred tax asset related to Tax Sharing Agreement | 1,600,000 |
Additional paid-in capital charged as a result of adjustments to a deferred tax liability |  | $ 900,000

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