Remaining Unfunded Commitments to Venture Capital or Private Equity Funds by our Consolidated Managed Funds (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	$ 7,049
SVB Strategic Investors Fund, LP
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	2,250
SVB Capital Preferred Return Fund, LP
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	1,514
SVB Capital-NT Growth Partners, LP
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	$ 3,285