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Securities Financing Including Redeemable Preferred Stocks- Summary of Redeemable Preferred Stock (Parenthetical) (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Series E Redeemable Preferred Stock [Member]
Class Of Stock [Line Items]
Redeemable preferred stock issuance costs	$ 10.6
Series F Redeemable Preferred Stock [Member]
Class Of Stock [Line Items]
Redeemable preferred stock issuance costs	$ 10.6

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- Definition

Temporary equity issuance costs.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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