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Selected Financial Ratios and Other Data - Summary of Selected Financial Ratios and Other Data (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment Holdings [Line Items]        
Undistributed net investment income per share $ 0.00 $ 0.00 $ 0.00 $ 0.00
Undistributed net realized gains per share $ 0.00 $ 0.00 $ 0.00 $ 0.00
Servicing fee $ 1,290 $ 5,272 $ 5,421 $ 5,658
Operating expenses $ 1,150 $ 4,211 $ 5,249 $ 6,044
Total expense ratio [1],[2],[3] 10.02% (3.03%) 29.36% 9.45%
Operating expense ratio [1],[2] 5.87% 4.83% 8.23% 6.04%
Net investment income ratio     1.88%  
Goodwill impairment writeoff     $ 5,099  
Total expense ratio excluding goodwill impairment writeoff     27.52%  
Operating expense ratio excluding goodwill impairment writeoff     6.39%  
Excluding Impact of Medallion Servicing Corp. Amounts [Member]        
Investment Holdings [Line Items]        
Total expense ratio 11.75% (1.37%) 29.42% 11.63%
Operating expense ratio 6.88% 6.31% 8.28% 8.23%
Net investment income ratio 7.51% (2.49%) 1.95% 5.94%
[1] MSC has assumed certain of the Company’s servicing obligations, and as a result, servicing fee income of $1,290, $5,272, $5,421, and $5,658, and operating expenses of $1,150, $4,211, $5,249, and $6,044, which formerly were the Company’s, were now MSC’s for the three months ended March 31, 2018 and the years ended December 31, 2017, 2016, and 2015. 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, (1.37%), 6.31%, and (2.49%) in 2017, 29.42%, 8.28%, and 1.95% in 2016, and 11.63%, 8.23%, and 5.94% in 2015.
[2] These ratios include the goodwill impairment writeoff of $5,099 in 2016. Excluding the writeoff, the total expense, operating expense, and net investment income ratios were 27.52%, 6.39%, and 1.88% in 2016.
[3] Total expense ratio represents total expenses (interest expense, operating expenses, and income taxes) divided by average net assets.