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Legal and Regulatory Proceedings (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 23, 2016
Dec. 31, 2015
Legal Proceedings (Textual)    
Aggregate amount accrued for complaints and lawsuits   $ 2.5
Proposed regulatory matter potential requirements customer data, Description   As of December 31, 2015, New York represented 53% of GRE's total meters served and 44% of the total RCEs of GRE's customer base.
Subsequent Event [Member]    
Legal Proceedings (Textual)    
Proposed regulatory matter potential requirements, Description The PSC's order, which was to become effective March 4, 2016, would require that all REPs' electricity and natural gas offerings to residential and small business customers include an annual guarantee of savings compared to the price charged by the relevant incumbent utility or, for electricity offerings, provide at least 30% of the supply from renewable sources.