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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Thousands
May 05, 2017
Apr. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Subsequent Event [Line Items]          
Commitment to purchase alternative investment       $ 40,000 $ 50,000
Future Funding Commitments     $ 24,768 $ 24,768  
Subsequent Events          
Subsequent Event [Line Items]          
Commitment to purchase alternative investment   $ 50,000      
Funded commitment amount $ 16,500        
Subsequent Events | Unfunded Commitments          
Subsequent Event [Line Items]          
Future Funding Commitments $ 33,500