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Investments - Summary of Other Equity Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 57,323 $ 59,856
ABS [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 37,634 39,894
Atalanta Sosnoff [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 13,393 13,963
Luminis [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 6,296 $ 5,999