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Funds Borrowed - Summary of Key Attributes of Various Borrowing Arrangements with Lenders (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
Minimum [Member]  
Notes Payable [Line Items]  
Minimum monthly payments of pledged loan $ 12,000
Maximum [Member]  
Notes Payable [Line Items]  
Minimum monthly payments of pledged loan $ 81,000
Medallion Financial Corp [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Description of variable rate basis 30 day LIBOR was 2.02%, 360 day LIBOR was 2.03%,
Medallion Financial Corp [Member] | 30 Day LIBOR [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Debt Instrument interest rate, stated percentage 2.02%
Medallion Financial Corp [Member] | 360 Day LIBOR [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Debt Instrument interest rate, stated percentage 2.03%
Medallion Financial Corp [Member] | Prime Rate [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Debt Instrument interest rate, stated percentage 5.00%
Medallion Chicago [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Description of variable rate basis 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%.
Debt Instrument interest rate, stated percentage 3.75%
Medallion Chicago [Member] | Prime Rate Plus [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Basis spread on variable rate 0.50%
Medallion Chicago [Member] | Fixed Interest Rate [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Basis spread on variable rate 3.75%
Medallion Chicago [Member] | LIBOR Rate [Member] | Notes Payable to Banks [Member]  
Notes Payable [Line Items]  
Basis spread on variable rate 2.00%