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Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
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Nov. 18, 2010 | Mar. 08, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Real Goods Solar | Dec. 31, 2011 Class A Common Stock | Dec. 31, 2012 Class A Common Stock | Dec. 31, 2012 Class A Common Stock Board of Directors Chairman | Jun. 30, 2011 Class A Common Stock Real Goods Solar | Dec. 31, 2012 Class A Common Stock Real Goods Solar | Dec. 31, 2011 Class A Common Stock Real Goods Solar Vote | Dec. 19, 2011 Class A Common Stock Real Goods Solar Alteris | Dec. 31, 2012 Class B Common Stock | Dec. 31, 2011 Class B Common Stock | Dec. 31, 2012 Class B Common Stock Board of Directors Chairman | Dec. 31, 2011 Class B Common Stock Real Goods Solar Vote | Dec. 31, 2012 Long-Term Incentive Plan 2009 | Dec. 31, 2011 Long-Term Incentive Plan 2009 Class A Common Stock | Dec. 31, 2010 Long-Term Incentive Plan 2009 Class A Common Stock | Dec. 31, 2011 Long-Term Incentive Plan 1999 Class A Common Stock | Dec. 31, 2012 Long Term Incentive Plan, Two Thousand Nine and Nineteen Ninety Nine | Dec. 31, 2010 Long Term Incentive Plan, Two Thousand Nine and Nineteen Ninety Nine Class A Common Stock | Dec. 31, 2011 Long Term Incentive Plan Twenty Zero Eight Class A Common Stock Real Goods Solar | Dec. 31, 2010 Long Term Incentive Plan Twenty Zero Eight Class A Common Stock Real Goods Solar | Dec. 31, 2012 Noncontrolling Interest | Dec. 31, 2008 Noncontrolling Interest | Dec. 31, 2008 Accumulated Deficit | Dec. 31, 2008 Equity | Dec. 31, 2012 Class B Common Stock Converted Into Class A Common Stock
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares for compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,620 | 11,518 | 5,769 |  |  |  | 29,408 | 21,040 |  |  |  |  |
Percentage of ownership by parent in subsidiary |  |  | 51.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid from additional paid in capital |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid from retained earnings |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Gaiam, Inc.'s paid-in capital for its subsidiary's acquisition of a noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |
Issuance stock upon exercise of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,200 |  | 171,940 |  |  |  |  |  |  |
Number of shares repurchased |  |  |  |  |  |  | 628,003 |  |  | 379,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased, value |  |  |  | 2,264,000 |  |  | 2,300,000 |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Voting ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 37.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cash dividends declared | $ 0.15 | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in additional paid in capital resulting due to dividends declared |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of restatement with regards to Real Goods Solar's income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 161,000 | 203,000 | 364,000 |
Ownership percentage of common stock shares outstanding of chairman |  |  | 77.00% |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  | 17,297,844 | 17,330,464 | 668,682 |  |  |  |  | 5,400,000 | 5,400,000 | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Issuance of shares for compensation, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,000 | 74,000 |  |  |  |  |
Issuance of shares for acquisitions |  |  |  |  |  |  |  |  |  |  |  |  | 8,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares for acquisitions, value |  |  | $ 1,011,000 | $ 1,081,000 | $ 1,943,000 |  |  |  |  |  |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in Alteris |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of Real Goods Solar |  |  |  |  |  | 54.60% |  |  |  |  | 37.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration