Remaining Unfunded Commitments to Venture Capital or Private Equity Funds by our Consolidated Managed Funds (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	$ 4,504
Strategic Investors Fund, L.P.
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	1,338
Capital Preferred Return Fund, L.P.
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	1,603
Growth Partners, L.P.
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	$ 1,563