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Convertible and Long-term Debt Obligations - Term Loan - Additional Information (Detail) - SolarCity [Member] - Non-recourse debt [Member] - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2016
Dec. 31, 2016
Mar. 31, 2016
March 31, 2016 Agreement [Member] | Term Loan due in December 2017 [Member]      
Debt Instrument [Line Items]      
Maximum amount to be borrowed     $ 50,000,000
Line of credit, additional interest rate   3.25%  
Line of credit, fee for undrawn commitments   0.85%  
January 2016, Agreement [Member] | Term Loan due in January 2021 [Member]      
Debt Instrument [Line Items]      
Maximum amount to be borrowed $ 160,000,000    
Line of credit, additional interest rate 3.50%