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Investments - Schedule of Company's Investments in Limited Partnerships (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Investment Securities [Line Items]    
Carrying Value $ 22,716 $ 2,550
Unfunded Balance 22,231 9,860
Private US Lower Middle Market Companies [Member]    
Investment Securities [Line Items]    
Carrying Value 4,895 2,550
Unfunded Balance $ 7,549 $ 9,860
Percentage investment held by the entity 16.50% 16.50%
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member]    
Investment Securities [Line Items]    
Carrying Value $ 3,194  
Unfunded Balance $ 4,682  
Percentage investment held by the entity 0.65%  
Equity and Debt Securities Publicly Traded US and Non US Issuers [Member]    
Investment Securities [Line Items]    
Carrying Value $ 14,627  
Percentage investment held by the entity 66.78%  
Power Utility and Energy Industries and Infrastructure [Member]    
Investment Securities [Line Items]    
Unfunded Balance $ 10,000