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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% |  |

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