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Related Party Transactions - Additional Information (Detail) (USD $)
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12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Class A Common Stock
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Dec. 31, 2012
Class A Common Stock
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Nov. 05, 2013
Real Goods Solar
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Dec. 19, 2011
Real Goods Solar
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Apr. 23, 2013
Real Goods Solar
|
Dec. 31, 2013
Real Goods Solar
|
Dec. 31, 2012
Real Goods Solar
Loan
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Dec. 31, 2011
Real Goods Solar
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Dec. 31, 2013
Real Goods Solar
Scenario 1
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Mar. 27, 2013
Real Goods Solar
Scenario 1
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Dec. 31, 2013
Real Goods Solar
Scenario 2
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Mar. 27, 2013
Real Goods Solar
Scenario 2
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Dec. 31, 2013
Real Goods Solar
Class A Common Stock
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| Related Party Transaction [Line Items] | ||||||||||||||||
| Intercorporate services agreement termination date | December 19, 2013 | |||||||||||||||
| Related party transaction | $ 0 | $ 300,000 | $ 400,000 | |||||||||||||
| Federal income tax rate | 34.00% | 34.00% | 34.00% | 34.00% | ||||||||||||
| Operating loss carryforwards, if unused, 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 | 22,000 | |||||||||||||||
| Gain from sale of investment | 25,096,000 | 25,000,000 | ||||||||||||||
| Common stock , Voting percentage | 20.00% | |||||||||||||||
| Unsecured and subordinated loans, number of loans outstanding | 2 | |||||||||||||||
| Unsecured and subordinated loans, total amount receivable | 1,700,000 | 2,700,000 | 1,000,000 | 1,700,000 | ||||||||||||
| Percentage annual interest rate on advanced investment | 10.00% | |||||||||||||||
| Maturity date of loan advanced | Apr. 26, 2014 | Apr. 30, 2014 | ||||||||||||||
| Unsecured and subordinated loans, total amount converted to shares | 100,000 | |||||||||||||||
| Unsecured and subordinated loans, shares converted | 62,111 | |||||||||||||||
| Collections for loans receivable | 2,100,000 | |||||||||||||||
| Acquisition of RSOL's tenant leasehold improvements | $ 200,000 | |||||||||||||||
| Common stock outstanding | 18,595,121 | 17,330,464 | 836,989 | |||||||||||||