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Schedule of Pre-Tax Changes in Unrealized and Realized Gains and Losses in Investment Portfolio (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Net change in unrealized appreciation (depreciation) on investments    
Unrealized appreciation $ 37,797  
Unrealized depreciation 40,067  
Net unrealized appreciation on investments in Medallion Bank and other controlled subsidiaries [1]   $ 29,115
Net realized gains (losses) on investments    
Total [1],[2]   $ (34,745)
Investment Company Accounting [Member]    
Net change in unrealized appreciation (depreciation) on investments    
Unrealized appreciation (998)  
Unrealized depreciation (38,152)  
Realized losses 34,747  
Net unrealized losses on investments other than securities and other assets (1,915)  
Total 22,797  
Net realized gains (losses) on investments    
Realized losses (34,747)  
Direct charge-offs 2  
Total (34,745)  
Medallion Financing Trust I [Member] | Investment Company Accounting [Member]    
Net change in unrealized appreciation (depreciation) on investments    
Net unrealized appreciation on investments in Medallion Bank and other controlled subsidiaries $ 29,115  
[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.
[2] There were no net losses on investment securities of affiliated issuers for the year ended December 31, 2018.