Summary of Significant Accounting Policies - Additional Information (Details)				1 Months Ended		3 Months Ended		9 Months Ended
	Apr. 26, 2022 USD ($)	Feb. 28, 2022 USD ($)	May 15, 2020 shares	Jul. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment Facility shares	Sep. 30, 2021 USD ($)	Nov. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Line Items]
Other comprehensive income (loss)						$ 0	$ 0	$ 0	$ 0
Cash deposits included in restricted cash						94,305,000		94,305,000			$ 82,450,000
Interest income						5,104,000	2,930,000	12,991,000	7,288,000
Interest expense						9,704,000	7,028,000	$ 28,617,000	14,720,000
Number of reporting units | Segment								4
Valuation allowance for finance receivables classified as held for sale						6,500,000		$ 6,500,000
Debt instrument aggregate principal amount						98,484,000		98,484,000
Aggregate principal amount						127,270,000		127,270,000
Gain on debt extinguishment						$ 37,917,000		$ 37,917,000
Issuance of shares | shares						0		0
RA Agreement
Accounting Policies [Line Items]
Common stock, issued | shares			183,870
Performance Shares
Accounting Policies [Line Items]
Issuance of shares | shares			2,684
0.75% Unsecured Convertible Senior Notes Due 2026
Accounting Policies [Line Items]
Debt instrument aggregate principal amount					$ 625,000,000.0
Aggregate principal amount						$ 56,400,000		$ 56,400,000
Deferred issuance costs						1,100,000		1,100,000
Repurchase of notes in open-market transaction						18,500,000		18,500,000
Gain on debt extinguishment						37,900,000		37,900,000
Debt instrument interest rate					0.75%
Debt instrument maturity year					2026
Warehouse Credit Facility
Accounting Policies [Line Items]
Cash deposits included in restricted cash						9,356,000		9,356,000
Selling, General and Administrative Expenses
Accounting Policies [Line Items]
Advertising expense						14,900,000	35,200,000	69,800,000	88,300,000
Amount of Upfront Shares was Written Off	$ 2,100,000
Selling, General and Administrative Expenses | Shipping and Handling
Accounting Policies [Line Items]
Shipping and handling expenses						4,900,000	$ 22,700,000	39,900,000	$ 58,000,000.0
Other Loss (Income), Net
Accounting Policies [Line Items]
Other net losses due to changes in fair value						(3,500,000)		15,800,000
Finance [Member]
Accounting Policies [Line Items]
Interest income						10,000,000.0		35,000,000.0
Interest expense						900,000		2,900,000
UACC
Accounting Policies [Line Items]
Debt instrument aggregate principal amount				$ 246,900,000
Aggregate principal amount				285,000,000.0
Net proceeds from securitization		$ 317,300,000
Percentage of notes and residual certificates sold		5.00%
Collateralized finance receivable								318,500,000
Carrying value of finance receivables								287,700,000
UACC | Line Of Credit
Accounting Policies [Line Items]
Net proceeds from securitization				265,600,000
Asset-backed Securities | UACC
Accounting Policies [Line Items]
Securitization transaction		$ 281,400,000		242,300,000
Residual Interest, 2022-1 Securitization | UACC
Accounting Policies [Line Items]
Securitization transaction		$ 32,300,000		$ 17,300,000
Vehicle Floorplan Facility | Line Of Credit
Accounting Policies [Line Items]
Increased borrowing capacity						350,600,000		350,600,000
2022 Vehicle Floorplan Facility | Line Of Credit | Subsequent Events
Accounting Policies [Line Items]
Increased borrowing capacity										$ 500,000,000.0
Lenders | Cash Deposits
Accounting Policies [Line Items]
Cash deposits included in restricted cash						39,000,000.0		$ 39,000,000.0
Diverse Bank Group | UACC
Accounting Policies [Line Items]
Number of warehouse credit facilities | Facility								3
Diverse Bank Group | UACC | Warehouse Credit Facility
Accounting Policies [Line Items]
Increased borrowing capacity						$ 550,000,000.0		$ 550,000,000.0