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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
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%