For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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

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-Name Accounting Standards Codification

-Topic 275

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-Section 50

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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.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Number of additional consolidated sponsored investment products.

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Number of sponsored investment products consolidated.

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Number of sponsored investment products deconsolidated.

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Percentage Of Borrowings On Assets Available As Collateral

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Consolidated Sponsored Investment Products - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($) Product	Dec. 31, 2014 Product	Sep. 30, 2014 USD ($)
Condensed Financial Statements, Captions [Line Items]
Number of consolidated sponsored investment products \| Product	14	12
Number of additional consolidated sponsored investment products \| Product	3
Number of deconsolidated sponsored investment products \| Product	1
Fair value, securities, Level 1 to Level 2 transfers, amount	$ 0		$ 0
Consolidated Sponsored Investment Products [Member]
Condensed Financial Statements, Captions [Line Items]
Fair value, securities, Level 2 to Level 1 transfers, amount	8,900,000		0
Fair value, securities, Level 1 to Level 2 transfers, amount	$ 300,000		$ 0
Consolidated Sponsored Investment Products [Member] \| Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Percentage of permitted borrowings (up to)	33.33%
Consolidated Sponsored Investment Products [Member] \| Derivative Assets [Member] \| Credit Concentration Risk [Member]
Condensed Financial Statements, Captions [Line Items]
Concentration risk percentage	34.40%
Consolidated Sponsored Investment Products [Member] \| Derivative Liabilities [Member] \| Credit Concentration Risk [Member]
Condensed Financial Statements, Captions [Line Items]
Concentration risk percentage	40.90%