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Business Combinations - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition related adjustments |  |  |  | $ 0 | $ (87) | $ 0 |
Goodwill |  | $ 170,153 | $ 170,153 | 170,153 | 6,788 | 6,701 | $ 5,260
RidgeWorth |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price, consideration transferred | $ 547,100 | $ 51,700 |  |  |  |  |
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 |  |  |  |  |  |
Acquisition related adjustments |  |  | 1,000 |  |  |  |
Goodwill | 163,365 |  |  |  |  |  |
Acquisition costs included in goodwill for tax purposes | 6,400 |  |  |  |  |  |
Transaction and integration costs |  |  |  | 26,300 |  |  |
Severance costs |  |  |  | 10,200 |  |  |
Other operating expenses |  |  |  | 9,700 |  |  |
Employment expenses |  |  |  | 6,400 |  |  |
Revenue since closing date |  |  | $ 77,100 |  |  |  |
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 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Other operating expenses |  |  |  | 69,410 | $ 50,274 | $ 63,901 |
Consolidated entity excluding consolidated investment products | RidgeWorth |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price, consideration transferred | 485,200 |  |  |  |  |  |
CLOs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Other operating expenses |  |  |  | $ 6,684 |  |  |
CLOs | RidgeWorth |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price, consideration transferred | $ 61,900 |  |  |  |  |  |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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