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Business Combination - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, cash |  |  |  | $ 471,400 |  |
Goodwill |  | $ 170,153 |  | 170,153 |  | $ 6,788
Contingent consideration |  | 51,690 |  | 51,690 |  | $ 0
Other operating expenses |  | 17,733 | $ 11,392 | 51,195 | $ 34,614 |
RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 547,100 |  |  |  |  |
Purchase price, cash | $ 471,400 |  |  |  |  |
Purchase price, shares issued (in shares) | 213,669 |  |  |  |  |
Purchase price, shares issued, value | $ 21,700 |  |  |  |  |
Purchase price, price of shares issued (in dollars per share) | $ 101.76 |  |  |  |  |
Purchase price, contingent consideration | $ 51,700 |  |  |  |  |
Consideration transferred, deferred cash | 2,300 |  |  |  |  |
Measurement period adjustment |  | 1,000 |  |  |  |
Goodwill | 163,365 |  |  |  |  |
Contingent consideration | 51,700 |  |  |  |  |
Acquisition costs included in goodwill for tax purposes | 6,400 |  |  |  |  |
Transaction and integration costs |  | 4,900 |  | 22,900 |  |
Severance charges |  | 1,500 |  | 10,100 |  |
Other operating expenses |  | 1,200 |  | 8,500 |  |
Employment expenses |  | $ 2,200 |  | 4,300 |  |
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 |  |  |  |  |
Consolidated entity excluding consolidated investment products | RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | 485,200 |  |  |  |  |
CLOs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other operating expenses |  |  |  | $ 6,404 |  |
CLOs | RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 61,900 |  |  |  |  |

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