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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 01, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Total operating expenses |  | $ 105,624 | $ 90,948 | $ 212,035 | $ 160,677
Employment expenses |  | $ 54,868 | $ 42,992 | 115,564 | $ 82,633
Purchase price, cash |  |  |  | $ 471,400 |
RidgeWorth |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets under management | $ 40,100,000 |  |  |  |
Long term assets under management | 35,700,000 |  |  |  |
Liquidity strategy assets under management | 4,400,000 |  |  |  |
Purchase price | 547,100 |  |  |  |
Consolidated entity excluding consolidated investment products | RidgeWorth |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | 485,200 |  |  |  |
CLOs | RidgeWorth |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 61,900 |  |  |  |

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