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Equity Method Investment and Receivable from Investee (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Real Goods Solar [Member]
Sep. 30, 2012
Real Goods Solar [Member]
Dec. 31, 2011
Real Goods Solar [Member]
Dec. 31, 2011
Real Goods Solar [Member]
Class A Common Stock [Member]
Vote
Sep. 30, 2012
Real Goods Solar [Member]
Class A Common Stock [Member]
Dec. 31, 2011
Real Goods Solar [Member]
Class B Common Stock [Member]
Vote
Equity Method Investment and Receivable from Investee (Textual) [Abstract]                      
Owned Class A common stock                   37.50%  
Estimated fair value based on the closing market price of Class A common stock                   $ 7,000,000  
Equity in the net assets           2,900,000 2,900,000        
Number of votes per share                 1   10
Net loss (39,017,000)   (43,391,000)                
Income tax benefit (5,377,000) [1] (466,000) [1] (6,938,000) [1] (3,169,000) [1]              
Noncash portion of net loss (15,940,000) [1]   (17,580,000) [1]     14,300,000          
Goodwill, net deferred tax assets, and other asset impairment charges           36,500,000          
Carrying values of equity method investment         14,300,000 0 0        
Income tax benefit             5,100,000        
Deferred tax asset related to Tax Sharing Agreement           $ 0 $ 0 $ 1,600,000      
[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 three and nine months ended September 30, 2012 and as a consolidated subsidiary for the three and nine months ended September 30, 2011.