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Remaining Unfunded Commitments to Venture Capital or Private Equity Funds by our Consolidated Managed Funds (Detail) (USD $)
In Thousands
Sep. 30, 2011
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments$ 314,285
SVB Strategic Investors Fund, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments2,359
SVB Strategic Investors Fund II, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments14,512
SVB Strategic Investors Fund III, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments64,985
SVB Strategic Investors Fund IV, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments151,586
SVB Strategic Investors Fund V, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments18,030
SVB Capital Preferred Return Fund, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments27,053
SVB Capital-NT Growth Partners, LP
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments30,510
Other private equity fund
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unfunded Commitments$ 5,250