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Consolidated Sponsored Investment Products - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | $ 241,107 | $ 139,054
Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 10,734 |
Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 10,734 |
Level 1 [Member] | Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 10,249 |
Level 1 [Member] | Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 10,249 |
Level 2 [Member] | Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 485 |
Level 2 [Member] | Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 485 |
Level 3 [Member] | Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 |
Level 3 [Member] | Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 |
Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 241,395 | 139,054
Assets [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 146,692 | 47,114
Assets [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 94,415 | 91,940
Assets [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 288 |
Assets [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 94,359 | 91,940
Assets [Member] | 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 |
Assets [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 94,219 | 91,940
Assets [Member] | Level 1 [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 140 |
Assets [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 146,589 | 47,114
Assets [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 146,245 | 47,114
Assets [Member] | Level 2 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 196 |
Assets [Member] | Level 2 [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 148 |
Assets [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 447 |
Assets [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 447 |
Assets [Member] | 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 |
Assets [Member] | Level 3 [Member] | Derivatives Assets [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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