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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Changes in goodwill  
Balance at the beginning of the period $ 836,583
Goodwill recognized in ITG Acquisition 312,343
Balance at the end of the period 1,148,926
Operating Segments | Market Making  
Changes in goodwill  
Balance at the beginning of the period 755,292
Goodwill recognized in ITG Acquisition 0
Balance at the end of the period 755,292
Operating Segments | Execution Services  
Changes in goodwill  
Balance at the beginning of the period 81,291
Goodwill recognized in ITG Acquisition 312,343
Balance at the end of the period 393,634
Corporate  
Changes in goodwill  
Balance at the beginning of the period 0
Goodwill recognized in ITG Acquisition 0
Balance at the end of the period $ 0