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Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended		9 Months Ended		9 Months Ended	1 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Apr. 23, 2013 Real Goods Solar	Sep. 30, 2013 Real Goods Solar	Sep. 30, 2013 Real Goods Solar Loan	Nov. 05, 2013 Real Goods Solar Subsequent Event	Sep. 30, 2013 Real Goods Solar Scenario 1	Mar. 27, 2013 Real Goods Solar Scenario 1	Sep. 30, 2013 Real Goods Solar Scenario 2	Mar. 27, 2013 Real Goods Solar Scenario 2	Sep. 30, 2013 Real Goods Solar Minimum	Sep. 30, 2013 Real Goods Solar Class A Common Stock	May 28, 2013 Real Goods Solar Class A Common Stock
Related Party Transaction [Line Items]
Intercorporate services agreement termination date					December 19, 2013
Numbers of shares sold												1,000,000	6,017,500
Average share price												$ 2.00	$ 2.7552
Gain from sale of investment	$ 1,975,000	$ 18,404,000										$ 2,000,000	$ 16,400,000
Unsecured and subordinated loans, number of loans outstanding					2
Unsecured and subordinated loans, total amount receivable			1,700,000	2,600,000	2,600,000			1,000,000		1,600,000
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
Sale of capital stock for converting loan into securities											50,000
Subordinated loans receivable present carrying value				0	0
Collections for loans receivable						2,300,000
Acquisition of RSOL's tenant leasehold improvements						200,000
Loan Interest income				$ 39,000	$ 125,000

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