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Selected Financial Ratios and Other Data - Summary of Selected Financial Ratios and Other Data (Parenthetical) (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Investment Holdings [Line Items]  
Undistributed net investment income per share | $ / shares $ 0.00
Undistributed net realized gains per share | $ / shares $ 0.00
Servicing fee | $ $ 1,290
Operating expenses | $ $ 1,150
Total expense ratio 10.02% [1],[2]
Operating expense ratio 5.87% [1]
Excluding Impact of Medallion Servicing Corp. Amounts [Member]  
Investment Holdings [Line Items]  
Total expense ratio 11.75%
Operating expense ratio 6.88%
Net investment income ratio 7.51%
[1] MSC has assumed certain of the Company’s servicing obligations, and as a result, servicing fee income of $1,290, and operating expenses of $1,150, which formerly were the Company’s, were now MSC’s for the three months ended March 31, 2018. Excluding the impact of the MSC amounts, the total expense ratio, operating expense ratio, and net investment income (loss) ratio would have been 11.75%, 6.88%, and 7.51% in the March 31, 2018 quarter.
[2] Total expense ratio represents total expenses (interest expense, operating expenses, and income taxes) divided by average net assets.