Fair Value and Future Funding Commitments Related to These Investments (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		$ 66,121	$ 32,592
Future Funding Commitments		24,768	20,014
Real Estate Fund, LP
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	[1]	0
European Non-Performing Loan Fund, LP
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	[2]	32,922	32,592
Future Funding Commitments	[2]	15,714	$ 20,014
Private Middle Market Loans, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	[3]	33,199
Future Funding Commitments	[3]	$ 9,054

[1] This limited partnership invests in real estate assets through a combination of direct or indirect investments in partnerships, limited liability companies, mortgage loans, and lines of credit. The Company does not have the contractual option to redeem its limited partnership interest but receives distributions based on the liquidation of the underlying assets. The Company does not have the ability to sell or transfer its limited partnership interest without consent from the general partner. The Company continues to hold an investment in this limited partnership and has written the fair value down to zero.

[2] This limited partnership invests in distressed securities and assets through senior and subordinated, secured and unsecured debt and equity, in both public and private large-cap and middle-market companies. The Company does not have the ability to sell or transfer its limited partnership interest without consent from the general partner. The Company does not have the contractual option to redeem its limited partnership interest but receives distributions based on the liquidation of the underlying assets. Based on the terms of the partnership agreement, the Company anticipates its interest in this partnership to be redeemed by 2020.

[3] This limited partnership provides financing for middle market companies. The Company does not have the ability to sell or transfer its limited partnership interest without consent from the general partner. The Company does not have the contractual option to redeem its limited partnership interest but receives distributions based on the liquidation of the underlying assets. Based on the terms of the investment management agreement, the Company anticipates its interest to be redeemed no later than 2024.