Investment in Unconsolidated Affiliates - Summary of Financial Information (Details) - Solar Gen Two Holdings North Star Holdings Lost Hills Blackwell Holdings Henrietta Holdings And Stateline Holdings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Summary statements of operations information:
Revenue	$ 42,277	$ 16,101	$ 61,893	$ 24,751
Operating expenses	25,519	9,844	51,912	20,769
Net loss	$ 13,430	$ 6,382	$ 5,671	$ 4,212