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Consolidated Sponsored Investment Products - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Total assets measured at fair value | $ 126,056 | $ 257,368
Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total assets measured at fair value | 126,056 | 257,368
Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total assets measured at fair value | 0 | 0
Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total assets measured at fair value | 0 | 0
Consolidated Sponsored Investment Products [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivatives | 3,279 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivatives | 1,843 |
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivatives | 758 | 381
Total assets measured at fair value | 312,187 | 237,033
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivatives | 1,320 | 191
Short sales | 9,855 | 8,165
Total liabilities measured at fair value | 11,175 | 8,356
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 148,589 | 136,115
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 162,840 | 100,537
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivatives | 125 | 154
Total assets measured at fair value | 155,888 | 82,571
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivatives | 403 | 191
Short sales | 9,432 | 7,491
Total liabilities measured at fair value | 9,835 | 7,682
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 155,763 | 82,417
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivatives | 633 | 227
Total assets measured at fair value | 155,373 | 153,397
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivatives | 917 | 0
Short sales | 423 | 674
Total liabilities measured at fair value | 1,340 | 674
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 147,663 | 135,050
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 7,077 | 18,120
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivatives | 0 | 0
Total assets measured at fair value | 926 | 1,065
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivatives | 0 | 0
Short sales | 0 | 0
Total liabilities measured at fair value | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | 926 | 1,065
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Investments | $ 0 | $ 0

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