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Convertible and Long-Term Debt Obligations - 1.625% Convertible Senior Notes due in 2019 - Additional Information (Detail) - 1.625% Convertible Senior Notes due in 2019 [Member] - SolarCity [Member]
1 Months Ended 12 Months Ended
Oct. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
$ / Derivative
shares
Capped Call Option [Member]      
Debt Instrument [Line Items]      
Shares received upon the exercise of the capped call options     745,377
Capped call options, specification     (i) the lower of $1,146.18 or the then market price of our common stock less (ii) $759.36 and divided by (b) the then market price of our common stock. The results of this formula are that we would receive more shares as the market price of our common stock exceeds $759.36 and approaches $1,146.18, but we would receive less shares as the market price of our common stock exceeds $1,146.18.
Cap price | $ / Derivative     1,146.18
Initial strike price | $ / Derivative     759.36
Maximum [Member]      
Debt Instrument [Line Items]      
Derivative, Maturity Date     Oct. 29, 2019
Minimum [Member]      
Debt Instrument [Line Items]      
Derivative, Maturity Date     Sep. 04, 2019
Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal amount of convertible senior notes | $ $ 66,000,000 $ 500,000,000  
Interest Rate 1.625% 1.625%  
Maturity Dates Nov. 01, 2019 Nov. 01, 2019  
Convertible principal amount | $     $ 1,000
Convertible instrument, shares issued     1.3169
Convertible notes, conversion price | $ / shares     $ 759.36
Senior Notes [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Convertible instrument, shares issued     1.7449
Senior Notes [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Convertible notes, conversion price | $ / shares     $ 573.10