Summary of Significant Accounting Policies - Schedule of Impact of New Revenue Standard on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 1,155,001		$ 1,155,001			$ 515,381
Inventory	3,314,127		3,314,127			2,263,537
Prepaid expenses and other current assets	325,232		325,232			268,365
Other assets	431,819		431,819			273,123
Liabilities
Accrued liabilities and other	1,990,095		1,990,095			1,731,366
Deferred revenue	570,920		570,920			1,015,253
Resale value guarantees	604,949		604,949			787,333
Customer deposits	905,838		905,838			853,919
Deferred revenue, net of current portion	950,126		950,126			1,177,799
Resale value guarantees, net of current portion	455,762		455,762			2,309,222
Other long-term liabilities	2,555,319		2,555,319			2,442,970
Redeemable noncontrolling interests in subsidiaries	551,264		551,264			397,734
Equity
Accumulated other comprehensive income	8,271		8,271			33,348
Accumulated deficit	(5,457,315)		(5,457,315)			(4,974,299)
Noncontrolling interests in subsidiaries	793,467		793,467			997,346
Revenues
Revenues	6,824,413		14,235,395
Automotive leasing	220,461	$ 286,158	633,713	$ 813,462
Cost of revenues
Automotive leasing	119,283	175,224	360,694	516,683
Provision (benefit) for income taxes	16,647	(285)	35,959	40,640
Net loss	254,673	(671,163)	(1,272,660)	(1,469,771)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	(56,843)	(51,787)	(157,086)	(183,721)
Net income (loss) attributable to common stockholders	311,516	(619,376)	(1,115,574)	(1,286,050)
Foreign currency translation adjustment	(10,274)	10,289	(25,077)	50,560
Comprehensive income (loss)	301,242	(609,087)	(1,140,651)	(1,241,060)
Automotive [Member]
Revenues
Revenues	5,878,305	2,076,731	11,558,051	6,125,643
Cost of revenues
Cost of revenues	4,405,919	1,755,622	9,027,055	4,724,849
Energy Generation and Storage [Member]
Revenues
Revenues	399,317	317,505	1,183,747	818,229
Cost of revenues
Cost of revenues	330,554	$ 237,288	1,036,190	$ 592,823
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
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 income					48,569
Accumulated deficit					(4,351,127)
Noncontrolling interests in subsidiaries					908,262
Adoption of ASU 2014-09 [Member] | Adjustments from Adoption of New Revenue Standard [Member]
Assets
Accounts receivable, net	55,087		55,087
Inventory	(117,058)		(117,058)		(27,009)
Prepaid expenses and other current assets	78,176		78,176		51,735
Other assets	109,972		109,972		68,355
Liabilities
Accrued liabilities and other	93,776		93,776		74,487
Deferred revenue	(509,323)		(509,323)		(436,737)
Resale value guarantees	(373,566)		(373,566)		(295,909)
Customer deposits	55,609		55,609		56,081
Deferred revenue, net of current portion	(437,703)		(437,703)		(429,771)
Resale value guarantees, net of current portion	(1,561,099)		(1,561,099)		(1,346,179)
Other long-term liabilities	113,776		113,776		104,767
Redeemable noncontrolling interests in subsidiaries	6,949		6,949		8,101
Equity
Accumulated other comprehensive income	(5,604)		(5,604)		15,221
Accumulated deficit	830,055		830,055		623,172
Noncontrolling interests in subsidiaries	(78,266)		(78,266)		(89,084)
Revenues
Automotive leasing	(249,376)		(603,526)
Cost of revenues
Automotive leasing	(188,674)		(450,977)
Provision (benefit) for income taxes	(337)		(1,370)
Net loss	79,861		216,549
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	5,295		9,666
Net income (loss) attributable to common stockholders	74,566		206,883
Foreign currency translation adjustment	(5,306)		(20,825)
Comprehensive income (loss)	69,260		139,628
Adoption of ASU 2014-09 [Member] | Adjustments from Adoption of New Revenue Standard [Member] | Automotive [Member]
Revenues
Revenues	478,989		1,143,643
Cost of revenues
Cost of revenues	329,875		795,727
Adoption of ASU 2014-09 [Member] | Adjustments from Adoption of New Revenue Standard [Member] | Energy Generation and Storage [Member]
Revenues
Revenues	(8,888)		19,812
Adoption of ASU 2014-09 [Member] | Balances Without Adoption of New Revenue Standard [Member]
Assets
Accounts receivable, net	1,099,914		1,099,914
Inventory	3,431,185		3,431,185
Prepaid expenses and other current assets	247,056		247,056
Other assets	321,847		321,847
Liabilities
Accrued liabilities and other	1,896,319		1,896,319
Deferred revenue	1,080,243		1,080,243
Resale value guarantees	978,515		978,515
Customer deposits	850,229		850,229
Deferred revenue, net of current portion	1,387,829		1,387,829
Resale value guarantees, net of current portion	2,016,861		2,016,861
Other long-term liabilities	2,441,543		2,441,543
Redeemable noncontrolling interests in subsidiaries	544,315		544,315
Equity
Accumulated other comprehensive income	13,875		13,875
Accumulated deficit	(6,287,370)		(6,287,370)
Noncontrolling interests in subsidiaries	871,733		871,733
Revenues
Automotive leasing	469,837		1,237,239
Cost of revenues
Automotive leasing	307,957		811,671
Provision (benefit) for income taxes	16,984		37,329
Net loss	174,812		(1,489,209)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	(62,138)		(166,752)
Net income (loss) attributable to common stockholders	236,950		(1,322,457)
Foreign currency translation adjustment	(4,968)		(4,252)
Comprehensive income (loss)	231,982		(1,280,279)
Adoption of ASU 2014-09 [Member] | Balances Without Adoption of New Revenue Standard [Member] | Automotive [Member]
Revenues
Revenues	5,399,316		10,414,408
Cost of revenues
Cost of revenues	4,076,044		8,231,328
Adoption of ASU 2014-09 [Member] | Balances Without Adoption of New Revenue Standard [Member] | Energy Generation and Storage [Member]
Revenues
Revenues	408,205		1,163,935
Operating Lease Vehicles [Member]
Assets
Operating lease vehicles, net	2,186,137		2,186,137			$ 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	(1,991,573)		(1,991,573)		$ (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	$ 4,177,710		$ 4,177,710