• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Investments - Schedule of Company's Investments in Limited Partnerships (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investment Securities [Line Items]    
Carrying Value $ 23,184 $ 29,263
Unfunded Balance 14,328 13,554
Private US Lower Middle Market Companies [Member]    
Investment Securities [Line Items]    
Carrying Value 7,276 6,246
Unfunded Balance $ 5,505 $ 6,428
Percentage investment held by the entity 15.37% 16.50%
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member]    
Investment Securities [Line Items]    
Carrying Value $ 7,951 $ 7,358
Unfunded Balance $ 1,745 $ 1,360
Percentage investment held by the entity 1.76% 1.76%
Power Utility and Energy Industries and Infrastructure [Member]    
Investment Securities [Line Items]    
Carrying Value $ 7,509 $ 4,326
Unfunded Balance $ 2,512 $ 5,766
Percentage investment held by the entity 0.18% 0.18%
Equity and Debt Securities Publicly Traded US and Non US Issuers [Member]    
Investment Securities [Line Items]    
Carrying Value   $ 11,333
Percentage investment held by the entity   66.58%
Senior and Junior Debts of Private Equity-Backed Companies [Member]    
Investment Securities [Line Items]    
Carrying Value $ 448  
Unfunded Balance $ 4,566  
Percentage investment held by the entity 0.47%