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Acquisitions - Subsequent Events and Transfer of Balance of Equity Narrative (Details) - Subsequent event
$ in Millions
1 Months Ended
Apr. 08, 2016
USD ($)
MW
Oct. 31, 2016
USD ($)
Nov. 30, 2016
Apr. 30, 2016
Alto Cielo        
Business Acquisition [Line Items]        
Percentage of voting interests acquired 100.00%      
Capacity of acquired power plants | MW 26.4      
Payments to acquire businesses $ 32.3      
Escrow deposit $ 1.9      
NSM Suryalabh, NSM Sitra and NSM L'Volta        
Business Acquisition [Line Items]        
Percentage of voting interests acquired       51.00%
Focal Solar Power Plant        
Business Acquisition [Line Items]        
Percentage of voting interests acquired   51.00%    
Payments to acquire businesses   $ 0.5    
Millenium Solar Power        
Business Acquisition [Line Items]        
Additional ownership interest acquired   11.00%    
Payments to acquire additional interest in subsidiaries   $ 1.0    
Azure        
Business Acquisition [Line Items]        
Percentage of voting interests acquired     26.00%