Summary of Significant Accounting Policies - Schedule of Impact of New Revenue Standard on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Inventory	$ 2,565,826			$ 2,263,537
Prepaid expenses and other current assets	379,379			268,365
Other assets	415,478			273,123
Liabilities
Accrued liabilities and other	1,898,431			1,731,366
Deferred revenue	536,465			1,015,253
Resale value guarantees	629,112			787,333
Customer deposits	984,823			853,919
Redeemable noncontrolling interests in subsidiaries	405,835			397,734
Deferred revenue, net of current portion	818,250			1,177,799
Resale value guarantees, net of current portion	756,800			2,309,222
Other long-term liabilities	2,561,886			2,442,970
Redeemable noncontrolling interests in subsidiaries	405,835			397,734
Equity
Accumulated other comprehensive gain	82,921			33,348
Accumulated deficit	(5,051,292)			(4,974,299)
Noncontrolling interests in subsidiaries	863,876			997,346
Customer deposits	984,823			853,919
Revenues
Automotive sales	2,561,881	$ 2,035,060
Automotive leasing	173,436	254,540
Energy generation and storage	410,022	213,944
Cost of revenues
Automotive sales	2,091,397	1,496,649
Automotive leasing	104,496	166,026
Provision for income taxes	5,605	25,278
Net loss	(784,627)	(397,181)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	(75,076)	(66,904)
Net loss attributable to common stockholders	(709,551)	(330,277)
Foreign currency translation adjustment	49,573	8,541
Comprehensive loss	(659,978)	$ (327,306)
Adoption of ASU 2014-09 [Member]
Assets
Inventory			$ 2,236,528
Prepaid expenses and other current assets			320,100
Other assets			341,478
Liabilities
Accrued liabilities and other			1,805,853
Deferred revenue			578,516
Resale value guarantees			491,424
Customer deposits			910,000
Redeemable noncontrolling interests in subsidiaries			405,835
Deferred revenue, net of current portion			748,028
Resale value guarantees, net of current portion			963,043
Other long-term liabilities			2,547,737
Redeemable noncontrolling interests in subsidiaries			405,835
Equity
Accumulated other comprehensive gain			48,569
Accumulated deficit			(4,351,127)
Noncontrolling interests in subsidiaries			908,262
Customer deposits			910,000
Adoption of ASU 2014-09 [Member] | Adjustments from Adoption of New Revenue Standard [Member]
Assets
Inventory	(31,229)		(27,009)
Prepaid expenses and other current assets	54,012		51,735
Other assets	75,088		68,355
Liabilities
Accrued liabilities and other	68,953		74,487
Deferred revenue	(451,126)		(436,737)
Resale value guarantees	(346,121)		(295,909)
Customer deposits	58,587		56,081
Redeemable noncontrolling interests in subsidiaries	7,931		8,101
Deferred revenue, net of current portion	(479,647)		(429,771)
Resale value guarantees, net of current portion	(1,416,843)		(1,346,179)
Other long-term liabilities	115,162		104,767
Redeemable noncontrolling interests in subsidiaries	7,931		8,101
Equity
Accumulated other comprehensive gain	30,771		15,221
Accumulated deficit	656,509		623,172
Noncontrolling interests in subsidiaries	(85,908)		(89,084)
Customer deposits	58,587		56,081
Revenues
Automotive sales	299,038
Automotive leasing	(164,939)
Energy generation and storage	(3,443)
Cost of revenues
Automotive sales	216,125
Automotive leasing	(121,085)
Provision for income taxes	(727)
Net loss	36,343
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	3,006
Net loss attributable to common stockholders	33,337
Foreign currency translation adjustment	15,550
Comprehensive loss	48,887
Adoption of ASU 2014-09 [Member] | Balances Without Adoption of New Revenue Standard [Member]
Assets
Inventory	2,597,055
Prepaid expenses and other current assets	325,367
Other assets	340,390
Liabilities
Accrued liabilities and other	1,829,478
Deferred revenue	987,591
Resale value guarantees	975,233
Customer deposits	926,236
Redeemable noncontrolling interests in subsidiaries	397,904
Deferred revenue, net of current portion	1,297,897
Resale value guarantees, net of current portion	2,173,643
Other long-term liabilities	2,446,724
Redeemable noncontrolling interests in subsidiaries	397,904
Equity
Accumulated other comprehensive gain	52,150
Accumulated deficit	(5,707,801)
Noncontrolling interests in subsidiaries	949,784
Customer deposits	926,236
Revenues
Automotive sales	2,262,843
Automotive leasing	338,375
Energy generation and storage	413,465
Cost of revenues
Automotive sales	1,875,272
Automotive leasing	225,581
Provision for income taxes	6,332
Net loss	(820,970)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	(78,082)
Net loss attributable to common stockholders	(742,888)
Foreign currency translation adjustment	34,023
Comprehensive loss	(708,865)
Operating Lease Vehicles [Member]
Assets
Operating lease vehicles, net	2,315,124			$ 4,116,604
Operating Lease Vehicles [Member] | Adoption of ASU 2014-09 [Member]
Assets
Operating lease vehicles, net			2,307,672
Operating Lease Vehicles [Member] | Adoption of ASU 2014-09 [Member] | Adjustments from Adoption of New Revenue Standard [Member]
Assets
Operating lease vehicles, net	(1,939,603)		$ (1,808,932)
Operating Lease Vehicles [Member] | Adoption of ASU 2014-09 [Member] | Balances Without Adoption of New Revenue Standard [Member]
Assets
Operating lease vehicles, net	$ 4,254,727