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Related Party Transactions - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 01, 2021	Mar. 31, 2022	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	[1]
Related Party Transaction [Line Items]
Repayments of note payable						$ 526,064,000	$ 414,277,000	$ 389,951,000
Medallion Servicing Corporation [Member]
Related Party Transaction [Line Items]
Interest income					$ 1,290,000
Other income					$ 256,000
LAX Group,LLC [Member] | Subsequent Event [Member] | Senior Vice President [Member]
Related Party Transaction [Line Items]
Salary from related party	$ 195,000
Officer [Member] | LAX Group,LLC [Member]
Related Party Transaction [Line Items]
Salary from related party			$ 133,000				178,000
Consulting services revenue from related party						$ 4,200
Officer [Member] | LAX Group,LLC [Member] | Common Class B [Member]
Related Party Transaction [Line Items]
Equity ownership percentage by a related party						10.00%
Common stock vesting percentage						3.34%
Percentage of equity raised from outside investors						5.00%
Percentage of bonus received from related party						10.00%
Officer [Member] | LAX Group,LLC [Member] | Common Class B [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Valuation of equity raised from outside investors						$ 1,500,000
Petty Trust [Member] | RPAC [Member]
Related Party Transaction [Line Items]
Annual payment for services provided to the entity						700,000
Repayments of note payable						$ 0
Sponsorship fees				$ 7,000,000
Proceeds from sponsorship							$ 5,600,000
Petty Trust [Member] | RPAC [Member] | Scenario Forecast [Member]
Related Party Transaction [Line Items]
Note payable to the Petty Trust		$ 7,442,000
Interest percentage of Notes payable		2.00%
[1] Balance includes the nine months ended December 31, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.

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