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Geographic Information and Business Segments - Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Total revenue $ 362,991 $ 815,053
Income (loss) before income taxes and noncontrolling interest (16,204) 468,536
Market Making    
Segment Reporting Information [Line Items]    
Total revenue 279,221 432,536
Income (loss) before income taxes and noncontrolling interest 47,539 163,163
Execution Services    
Segment Reporting Information [Line Items]    
Total revenue 83,518 383,779
Income (loss) before income taxes and noncontrolling interest (44,405) 331,185
Corporate    
Segment Reporting Information [Line Items]    
Total revenue 252 (1,262)
Income (loss) before income taxes and noncontrolling interest $ (19,338) $ (25,812)