Annual report pursuant to Section 13 and 15(d)

Geographical Data for Operations (Parenthetical) (Detail)

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Geographical Data for Operations (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Real Goods Solar
Revenues from External Customers and Long-Lived Assets [Line Items]        
Other non-current assets $ 24,481 $ 29,994 $ 29,427  
Reduction in net deferred tax assets due to restatement       $ 364,000