Investment in Unconsolidated Affiliates - Summary of Financial Information (Details) - Solar Gen Two Project Entity and North Star, Significant Investees - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2016	Mar. 29, 2015
Summary statements of operations information:
Revenue	$ 8,650	$ 7,744
Operating expenses	10,924	7,850
Net loss	$ (2,170)	$ (100)