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Derivative Activities - Derivative Fair Value Income (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Disclosure - Derivative Activities - Derivative Fair Value Income (Parenthetical) (Detail) [Line Items]
Derivatives that do not qualify or are not designated for hedge accounting, related to discontinuance of hedge accounting	$ 3.1	$ 25.5

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- Details

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- Definition

Amount of realized and unrealized gain of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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