Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2017	Dec. 31, 2014
Commitments and Contingencies [Line Items]
Commitment to purchase alternative investment		$ 25,000		$ 50,000	$ 50,000
Future Funding Commitments	$ 31,214		$ 31,214
European Non-Performing Loan Fund, LP
Commitments and Contingencies [Line Items]
Funded commitment amount	35,800
Distressed Debt Fund, LP
Commitments and Contingencies [Line Items]
Funded commitment amount	33,000
Unfunded Commitments | European Non-Performing Loan Fund, LP
Commitments and Contingencies [Line Items]
Future Funding Commitments	14,200
Unfunded Commitments | Distressed Debt Fund, LP
Commitments and Contingencies [Line Items]
Future Funding Commitments	$ 17,000