Funds Borrowed - Summary of Key Attributes of Various Borrowing Arrangements with Lenders (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Notes Payable [Line Items]
Average Interest Rate	2.48%	[1]
Notes Payable to Banks [Member]
Notes Payable [Line Items]
Note Amounts	$ 40,265
Balance outstanding	$ 32,223
Average Interest Rate	3.63%	[1]
Notes Payable to Banks [Member] | Medallion Financial Corp [Member]
Notes Payable [Line Items]
Note Dates	Apr. 30, 2011
Note Dates	Aug. 31, 2014
Maturity Dates	Sep. 30, 2020
Maturity Dates	Mar. 31, 2021
Type	Term loans and demand notes secured by pledged loans	[2]
Note Amounts	$ 20,416	[2]
Balance outstanding	$ 20,416
Payment	Interest only	[3]
Average Interest Rate	3.68%
Notes Payable to Banks [Member] | Medallion Chicago [Member]
Notes Payable [Line Items]
Note Dates	Nov. 30, 2011
Note Dates	Dec. 31, 2011
Maturity Dates	Feb. 28, 2021
Type	Term loans secured by owned Chicago medallions	[4]
Note Amounts	$ 18,449
Balance outstanding	$ 10,687
Payment	$134 of principal & interest paid monthly
Average Interest Rate	3.50%
Notes Payable to Banks [Member] | Medallion Funding [Member]
Notes Payable [Line Items]
Note Dates	Nov. 30, 2018
Maturity Dates	Dec. 31, 2023
Note Amounts	$ 1,400
Balance outstanding	$ 1,120
Payment	$70 principal & interest paid quarterly
Average Interest Rate	4.00%

[1] Weighted average contractual rate as of June 30, 2020.

[2] One note has an interest rate of Prime, one note has an interest rate of Prime plus 0.50%, one note has a fixed interest rate of 3.75%, one note has an interest rate of LIBOR plus 3.75%, and the other interest rates on these borrowings are LIBOR plus 2%.

[3] Various agreements call for remittance of all principal received on pledged loans subject to minimum monthly payments ranging up to or from $12 to $85.

[4] Guaranteed by the Company.