Long Term Debt - Additional Information (Details)				1 Months Ended	3 Months Ended		6 Months Ended
	May 03, 2023 USD ($)	Apr. 14, 2023 BusinessDays $ / shares	Jun. 18, 2021 USD ($) d $ / shares shares	Jul. 31, 2003 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 23, 2023 $ / shares	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Debt instrument aggregate principal amount					$ 422,580,000		$ 422,580,000			$ 82,556,000
Initial conversion price per share | $ / shares		$ 1.00							$ 1.00
Repurchases of convertible senior notes							13,194,000
Gain on debt extinguishment					10,931,000		19,640,000
Consecutive trading days | BusinessDays		30
Restricted cash (in thousands)					66,306,000		66,306,000			73,095,000
Expected payments, 2023					106,700,000		106,700,000
Expected payments, 2024					160,900,000		160,900,000
Expected payments, 2025					91,300,000		91,300,000
Expected payments, 2026					42,600,000		42,600,000
Expected payments, 2027					21,100,000		21,100,000
Outstanding balance					776,402,000		776,402,000			449,393,000
Current portion of long term debt					231,471,000		231,471,000			47,239,000
Long term debt, net of current portion					544,931,000		544,931,000			402,154,000
Junior subordinated debentures				$ 10,000,000.0
Junior Subordinated Debentures
Debt Instrument [Line Items]
Long-term debt, maturity date				Oct. 07, 2033
Long term debt, net of current portion					10,310,000		10,310,000			10,310,000
Percentage of owned finance subsidiary				100.00%
Financing of Beneficial Interest in Securizations
Debt Instrument [Line Items]
Current portion of long term debt					12,080,000		12,080,000
Long term debt, net of current portion					9,629,000		9,629,000
SOFR | Junior Subordinated Debentures
Debt Instrument [Line Items]
Variable interest rate				3.05%
Securitization Debt of Consolidated VIEs
Debt Instrument [Line Items]
Restricted cash (in thousands)					34,800,000		34,800,000			9,000,000.0
UACC | Repurchase Agreements
Debt Instrument [Line Items]
Expected beneficial interests in securitizations pledged as collateral	$ 24,500,000
Expected proceeds from beneficial interests in securitizations pledged as collateral	$ 24,100,000
Expected repurchases period start, month and year	2025-03
Expected repurchases period end, month and year	2029-09
UACC | Financing of Beneficial Interest in Securizations | Repurchase Agreements
Debt Instrument [Line Items]
Fair value of the collateral pledged amount					22,000,000.0		22,000,000.0
Outstanding balance					21,700,000		21,700,000
Current portion of long term debt					12,100,000		12,100,000
Long term debt, net of current portion					9,600,000		9,600,000
0.75% Unsecured Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Debt instrument aggregate principal amount			$ 625,000,000.0
Debt instrument interest rate			0.75%
Aggregate principal amount exercise in overallotment option granted to initial purchasers			$ 75,000,000.0
Long-term debt, frequency of periodic payment								semiannually
Long-term debt, beginning date of payment			Jan. 01, 2022
Long-term debt, maturity date			Jul. 01, 2026
Long-term debt payment terms								The Notes bear interest at a rate of 0.75% per annum, payable semiannually in arrears on January 1 and July 1 of each year, beginning on January 1, 2022.
Net proceeds from offering, after deducting commissions paid to initial purchasers and debt issuance costs paid to third-parties			$ 608,900,000
Debt conversion, each principal amount initially be convertible			$ 1,000
Initial conversion price per share | $ / shares			$ 56.01
Debt instrument conversion date			Apr. 01, 2026
Aggregate principal amount					18,200,000		32,800,000
Repurchases of convertible senior notes					7,300,000		13,200,000
Gain on debt extinguishment					10,900,000		19,600,000
Unamortized debt discount and debt issuance costs					5,100,000		5,100,000			6,500,000
Net carrying value of debt					327,400,000		327,400,000			$ 359,300,000
Interest expense					$ 1,100,000	$ 2,000,000.0	$ 2,200,000	$ 4,000,000.0
Effective interest rate					1.30%		1.30%
0.75% Unsecured Convertible Senior Notes Due 2026 | During any Fiscal Quarter Commencing After Fiscal Quarter Ending on September 30, 2021
Debt Instrument [Line Items]
Consecutive trading days | d			30
0.75% Unsecured Convertible Senior Notes Due 2026 | During any Fiscal Quarter Commencing After Fiscal Quarter Ending on September 30, 2021 | Minimum
Debt Instrument [Line Items]
Trading days | d			20
Conversion price			130.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | During Five Consecutive Business Day Period After any Ten Consecutive Trading Day Period
Debt Instrument [Line Items]
Debt conversion, each principal amount initially be convertible			$ 1,000
Consecutive trading days | d			10
0.75% Unsecured Convertible Senior Notes Due 2026 | During Five Consecutive Business Day Period After any Ten Consecutive Trading Day Period | Maximum
Debt Instrument [Line Items]
Conversion price			98.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | Company May Redeem On or after July 6, 2024
Debt Instrument [Line Items]
Consecutive trading days | d			30
Redemption percentage of principal amount			100.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | Company May Redeem On or after July 6, 2024 | Minimum
Debt Instrument [Line Items]
Trading days | d			20
Conversion price			130.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | Common Stock
Debt Instrument [Line Items]
Debt conversion, for each principal amount conversion to shares | shares			17.8527