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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Changes in goodwill  
Balance at the beginning of the period $ 836,583
Goodwill recognized in ITG Acquisition 357,334
Currency translation adjustment (220)
Balance at the end of the period 1,193,697
Market Making  
Changes in goodwill  
Balance at the beginning of the period 755,292
Goodwill recognized in ITG Acquisition 0
Currency translation adjustment 0
Balance at the end of the period 755,292
Execution Services  
Changes in goodwill  
Balance at the beginning of the period 81,291
Goodwill recognized in ITG Acquisition 357,334
Currency translation adjustment (220)
Balance at the end of the period 438,405
Corporate  
Changes in goodwill  
Balance at the beginning of the period 0
Goodwill recognized in ITG Acquisition 0
Currency translation adjustment 0
Balance at the end of the period $ 0