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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands | Jul. 01, 2018 | Jun. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 290,366 | $ 170,153 | $ 6,788 | $ 6,701
Sustainable Growth Advisers, LP |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired | 70.00% |  |  |  |  |
Purchase price, consideration transferred | $ 129,500 |  |  |  |  |
Goodwill | 120,213 |  |  |  |  |
Intangible assets | 62,000 |  |  |  |  |
Goodwill and other intangible assets, amount expected to be tax deductible | $ 127,500 |  |  |  |  |
RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, consideration transferred |  | $ 547,100 |  |  |  |
Goodwill |  | 163,365 |  |  |  |
Intangible assets |  | 275,700 |  |  |  |
Assets under management |  | 40,100,000 |  |  |  |
Long term assets under management |  | 35,700,000 |  |  |  |
Liquidity strategy assets under management |  | 4,400,000 |  |  |  |
Consolidated entity excluding consolidated investment products | RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, consideration transferred |  | 485,200 |  |  |  |
CLOs | RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, consideration transferred |  | $ 61,900 |  |  |  |
SGIA, LLC | Sustainable Growth Advisers, LP | Sustainable Growth Advisers, LP |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of membership interests | 100.00% |  |  |  |  |

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