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Convertible and Long-Term Debt Obligations - 2.75% Convertible Senior Notes due in 2018 - Additional Information (Detail) - SolarCity [Member] - 2.75% Convertible Senior Notes due in 2018 [Member] - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2013
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal amount of convertible senior notes $ 230,000,000  
Maturity Dates Nov. 01, 2018  
Interest Rate 2.75%  
Senior Notes [Member]    
Debt Instrument [Line Items]    
Convertible principal amount   $ 1,000
Convertible instrument, shares issued   1.7838
Convertible notes, conversion price   $ 560.64
Convertible senior notes, description   The convertible senior note holders may require us to repurchase their convertible senior notes for cash only under certain defined fundamental changes.
Senior Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Convertible instrument, shares issued   2.3635
Senior Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Convertible notes, conversion price   $ 423.10