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Share-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Before Amendment | Dec. 31, 2012 After Amendment | Dec. 31, 2011 Real Goods Solar | Dec. 31, 2010 Real Goods Solar | Dec. 31, 2012 Long Term Incentive Plan 2009 | Dec. 31, 2012 Long Term Incentive Plan 2009 Class A Common Stock | Mar. 05, 2012 Long-Term Incentive Plan 1999 Employee | Dec. 31, 2009 Long-Term Incentive Plan 1999 | Dec. 31, 2009 Long-Term Incentive Plan 1999 Maximum | Dec. 31, 2009 Long-Term Incentive Plan 1999 Minimum | Dec. 31, 2010 Long-Term Incentive Plan 1999 Chief Executive Officer | Nov. 04, 2010 Long-Term Incentive Plan 1999 Chief Executive Officer | Dec. 31, 2012 Long Term Incentive Plan, Two Thousand Nine and Nineteen Ninety Nine | Dec. 31, 2012 Employee Stock Option | Dec. 31, 2012 Non Employee Board Member Stock Options | Dec. 31, 2009 Stock Options Long-Term Incentive Plan 1999 Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that may be issued |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |
Plan termination date |  |  |  |  |  |  |  | Apr. 23, 2019 |  |  |  |  |  |  |  |  |  |  |
Rate at which options vest and become exercisable per month | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period over which options vest and become exercisable | 50 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to share-based payment awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 2 years |
Granted Stock Options expiration date |  |  |  | 7 years | 10 years |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Fair value assumptions dividend per share | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |
Total incremental share-based compensation cost |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Options vested, extended expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Incremental share-based compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,000 |  |  |  |  |
Number of employees award granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49
Revised exercise price per share |  |  |  |  |  |  |  |  |  |  | $ 5.00 |  |  |  |  |  |  |  |
Total incremental share-based compensation cost recognizable over 2009 through 2013 |  |  |  |  |  |  |  |  |  |  | 212,000 |  |  |  |  |  |  |  |
Total incremental share-based compensation cost recognizable, year |  |  |  |  |  |  |  |  |  |  |  | 2009 | 2013 |  |  |  |  |  |
Cash from stock options exercised |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value of options granted | $ 2.39 | $ 2.32 | $ 3.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  | 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested | 800,000 | 800,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 1,013,000 | 1,540,000 | 1,609,000 |  |  | 500,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit recognized for share-based compensation | 400,000 | 600,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized cost related to nonvested shared-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Expected cost to be recognized over a weighted-average period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 9 months 7 days |  |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References No definition available. + Details
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