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Net Income Per Share (Details) - Tradeweb Markets LLC - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Successor |  |  |  |
Net Income Per Share |  |  |  |
Net income | $ 29,307 |  |  |
Basic weighted average shares outstanding | 222,221,628 |  |  |
Dilutive effect of equity settled PRSUs | 22,223 |  |  |
Diluted weighted average shares outstanding | 222,243,851 |  |  |
Basic net income per share | $ 0.13 |  |  |
Diluted net income per share | $ 0.13 |  |  |
Predecessor |  |  |  |
Net Income Per Share |  |  |  |
Net income |  | $ 130,160 | $ 83,648 | $ 93,161
Basic weighted average shares outstanding |  | 215,365,920 | 212,568,635 | 210,979,704
Diluted weighted average shares outstanding |  | 215,365,920 | 212,568,635 | 210,979,704
Basic net income per share |  | $ 0.60 | $ 0.39 | $ 0.44
Diluted net income per share |  | $ 0.60 | $ 0.39 | $ 0.44
Predecessor | Convertible term note |  |  |  |
Net Income Per Share |  |  |  |
Shares excluded from computation of diluted earnings per share |  |  | 894,464 | 2,548,668
Predecessor | Contingent consideration |  |  |  |
Net Income Per Share |  |  |  |
Shares excluded from computation of diluted earnings per share |  | 5,444,566 |  |

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