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Consolidated Sponsored Investment Products - Additional Information (Detail) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 Funds | Dec. 31, 2013 Funds | Sep. 30, 2013
Investments [Abstract] |  |  |
Number of consolidated sponsored investment products | 12 | 8 |
Number of additional consolidated sponsored investment product | 5 |  |
Number of deconsolidated sponsored investment product | 1 |  |
Fair value, equity, Level 1 to Level 2 transfers, amount | $ 0 |  | $ 0
Fair value, equity, Level 2 to Level 1 transfers, amount |  |  | $ 5,200,000

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Details
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- Definition Number Of Mutual Funds Deconsolidated + References No definition available. + Details
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