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Consolidated Sponsored Investment Products - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 Funds | Dec. 31, 2013 Funds | Mar. 31, 2013
Investments [Abstract] |  |  |
Number of consolidated sponsored investment products | 8 | 8 |
Number of additional consolidated sponsored investment product | 1 |  |
Number of deconsolidated sponsored investment product | 1 |  |
Fair value, equity, Level 1 to Level 2 transfers, amount | $ 0 |  | $ 0

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + 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=25499696&loc=d3e19207-110258 + Details
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- Details
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- Definition Number Of Additional Consolidated Mutual Funds + References No definition available. + Details
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- Definition Number Of Consolidated Mutual Funds + References No definition available. + Details
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- Definition Number Of Mutual Funds Deconsolidated + References No definition available. + Details
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