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Commitments and Contingencies Disclosure [Line Items]

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Total collateral in the form of securities available to us to reimburse losses, if any, under financial and performance standby letters of credit

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780

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Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Additional Information (Detail) (USD $) In Millions			9 Months Ended
	Sep. 30, 2011 Standby Letters of Credit	Dec. 31, 2010 Standby Letters of Credit	Sep. 30, 2011 Venture capital and private equity fund investments	Sep. 30, 2011 Venture capital and private equity fund investments Lower Limit	Sep. 30, 2011 Venture capital and private equity fund investments Upper Limit
Commitments and Contingencies Disclosure [Line Items]
Deferred fees	$ 5.5	$ 5.2
Collateral in the form of cash	284.4
Collateral in the form of investment securities	$ 17.3
Commitments to invest, period from the inception of the fund			10 years
Expected commitment period to invest in venture capital and private equity funds (in years)				5 years	7 years