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Condensed Consolidated Statements of Financial Condition (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Class A Common Stock [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 750,000,000 750,000,000
Common stock, shares issued 328,529,000 306,218,000
Common stock, shares outstanding 279,279,000 256,968,000
Treasury stock, at cost 49,250,000 49,250,000
Class B Common Stock [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 34,848,000 34,848,000
Common stock, shares outstanding 34,848,107 34,848,000