• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Investments - Schedule of Company's Investments in Limited Partnerships (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2018
Private US Lower Middle Market Companies [Member]  
Investment Securities [Line Items]  
Expected term 10 years
Expiration date of capital commitment Sep. 03, 2019
Investment additional maturity term 2 years
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member]  
Investment Securities [Line Items]  
Expected term 3 years
Expiration date of capital commitment Jun. 30, 2018
Investment additional maturity term 2 years
Power Utility and Energy Industries and Infrastructure [Member]  
Investment Securities [Line Items]  
Expected term 10 years
Expiration date of capital commitment Jun. 30, 2020
Investment additional maturity term 3 years
Senior and Junior Debts of Private Equity-Backed Companies [Member]  
Investment Securities [Line Items]  
Expected term 6 years
Expiration date of capital commitment Dec. 01, 2019
Investment additional maturity term 2 years
Mature Real Estate Private Equity Funds And Portfolio Globally [Member]  
Investment Securities [Line Items]  
Expected term 8 years