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Investments Investments - Summary of Other Equity Investments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 86,532 $ 86,287
G5 Evercore [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 25,016 20,730
ABS [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 38,364 41,567
Atalanta Sosnoff [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 23,152 $ 23,990