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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
May 04, 2017
Apr. 20, 2017
Mar. 31, 2017
Mar. 31, 2016
Subsequent events        
Payments of dividends     $ 10,114 $ 9,378
KCG Holdings | Subsequent Events.        
Subsequent events        
Cash transaction value (in dollars per share)   $ 20.00    
Total agreement value   $ 1,400,000    
KCG Holdings | Scenario forecast | Subsequent Events.        
Subsequent events        
Face amount   $ 1,650,000    
Voting power (as a percent)   24.50%    
Class A | Subsequent Events.        
Subsequent events        
Dividends declared (in dollars per share) $ 0.24      
Class A | Temasek and North Island Holdings | KCG Holdings | Scenario forecast | Subsequent Events.        
Subsequent events        
Sale of common stock value   $ 750,000