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Consolidated Sponsored Investment Products - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | $ 62,086 | $ 139,054
Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 52,925 | 47,114
Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 9,161 | 91,940
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 9,161 | 91,940
Level 1 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 |
Level 1 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 9,161 | 91,940
Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 52,925 | 47,114
Level 2 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 52,925 | 47,114
Level 2 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 |
Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 |
Level 3 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 |
Level 3 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | $ 0 |

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- Definition Current investment securities of consolidated sponsored investment products, which includes financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer). + References No definition available. + Details
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