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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Customer
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Customer
Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue $ 1,190,000   $ 1,190,000   $ 882,800  
Deferred revenue recognized     113,500 $ 44,500    
Deferred revenue recognized in next 12 months     567,000      
Reduction in automotive sales revenues from buyback options 64,100   564,600      
Reduction in automotive cost of sales from buyback options 49,600   458,400      
Reduction in gross profit from buyback options 14,500   106,200      
Maximum repurchase price of vehicles under resale value arrangement 355,700   355,700   479,800  
Resale value exercisable by leasing partners 297,200   297,200      
Leasing revenue recognized 208,362 $ 239,816 423,482 413,252    
Resale value guarantees, current portion sales to customers 187,500   187,500   149,700  
Resale value guarantees, lease revenue recognized 37,300 60,600 84,800 76,700    
Right-of-use ("ROU") assets for operating leases 1,248,277   1,248,277      
Lease liabilities for operating leases 1,250,889   1,250,889      
Unrecognized tax benefits 299,100   299,100   253,400  
Unrecognized tax benefits, that would not affect effective tax rate 278,200   278,200   $ 243,800  
Increase in net loss attributable to common stockholders     $ 7,600      
Number of customers representing more than ten percentage of accounts receivable | Customer     1   0  
Accounts receivable from OEM customers excess percentage     10.00%   10.00%  
Total cost of operating lease vehicles 2,510,000   $ 2,510,000   $ 2,550,000  
Accumulated depreciation related to leased vehicles 435,900   435,900   457,600  
Assets 31,872,597   31,872,597   29,739,614  
Liabilities $ 24,722,136   $ 24,722,136   $ 23,426,010  
Recourse debt [Member] | 1.25% Convertible Senior Notes due in 2021 ("2021 Notes") [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Interest Rate 1.25%   1.25%   1.25%  
Maturity year     2021      
Recourse debt [Member] | 2.375% Convertible Senior Notes due in 2022 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Interest Rate 2.375%   2.375%   2.375%  
Maturity year     2022      
Recourse debt [Member] | 2.00% Convertible Senior Notes due in 2024 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Interest Rate 2.00%   2.00%      
Maturity year     2024      
Adoption of ASU 2016-02 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Right-of-use ("ROU") assets for operating leases           $ 1,285,617
Lease liabilities for operating leases           1,240,000
De-recognition of build-to-suit lease assets           1,620,000
De-recognition of build-to-suit lease liabilities           1,740,000
Increase (decrease) in accumulated deficit and additional paid-in-capital $ 96,662   $ 96,662      
Assets           473,300
Liabilities           570,000
Adoption of ASU 2016-02 [Member] | Build-to-suit Lease Arrangement [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Increase (decrease) in accumulated deficit and additional paid-in-capital           (96,700)
Adoption of ASU 2016-02 [Member] | Prepaid Expenses and Other Current Asset [Member]            
Summary Of Significant Accounting Policies [Line Items]            
New accounting pronouncement or change in accounting principle           141,600
Adoption of ASU 2016-02 [Member] | Other Liability [Member]            
Summary Of Significant Accounting Policies [Line Items]            
New accounting pronouncement or change in accounting principle           69,700
Adoption of ASU 2016-02 [Member] | Accumulated Deficit [Member]            
Summary Of Significant Accounting Policies [Line Items]            
New accounting pronouncement or change in accounting principle           $ 96,700
Increase (decrease) in accumulated deficit and additional paid-in-capital 96,662   96,662      
Customer payments [Member] | Energy Generation and Storage [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue 148,400   148,400   $ 148,700  
Deferred revenue recognized     21,800 28,600    
Deferred revenue recognized in next 12 months     4,800      
Unbilled transaction price allocated to performance obligations, expected of more than one year 102,200   102,200      
Rebates and Incentives [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue 35,300   35,300   36,800  
Vehicles [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Net carrying amount of operating lease vehicles 142,100   $ 142,100   211,500  
Solar Energy Systems [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Product warranty description     we also provide a warranty on the installation and components of the solar energy systems we sell for periods typically between 10 to 30 years.      
Operating Lease Vehicles [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Net carrying amount of operating lease vehicles 2,069,540   $ 2,069,540   2,089,758  
Warranty costs incurred for operating lease vehicles collateralized debt arrangements 5,700 7,000 11,300 12,800    
Sales To Leasing Companies With Guarantee [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue 68,700   68,700   92,500  
Resale value guarantee 399,800   399,800   558,300  
Leasing revenue recognized 49,800 $ 84,700 102,700 $ 167,200    
Net carrying amount of operating lease vehicles $ 332,900   332,900   468,500  
Automotive Regulatory Credits [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue recognized     $ 140,000   $ 0  
Automotive Regulatory Credits [Member] | Minimum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue, recognition period     1 year      
Automotive Regulatory Credits [Member] | Maximum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue, recognition period     3 years