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Share-Based Compensation Plans - Performance Restricted Share Units (Details) - Tradeweb Markets LLC | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) employee $ / shares shares | Sep. 30, 2018 $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares
Successor |  |  |  |
Share-Based Compensation Plans |  |  |  |
Number of employees impacted by modification | employee | 54 |  |  |
Employee equity compensation payable | $ | $ 24,187,000 |  |  |
Members' capital | $ | 4,573,200,000 |  |  |
Successor | Adjustment |  |  |  |
Share-Based Compensation Plans |  |  |  |
Employee equity compensation payable | $ | (19,072,000) |  |  |
Members' capital | $ | $ 19,072,000 |  |  |
Successor | Equity-settled PRSUs |  |  |  |
Number of PRSUs |  |  |  |
Outstanding, beginning of period | shares | 0 |  |  |
Converted to equity settled PRSUs | shares | 1,442.2 |  |  |
Outstanding, end of period | shares | 1,442.2 | 0 |  |
Weighted Average Fair Value of PRSUs |  |  |  |
Outstanding, beginning of period | $ / shares | $ 0 |  |  |
Converted to equity settled PRSUs | $ / shares | 30,482 |  |  |
Outstanding, end of period | $ / shares | $ 30,482 | $ 0 |  |
Successor | Equity-settled PRSUs | Recapitalization |  |  |  |
Number of PRSUs |  |  |  |
Outstanding, beginning of period | shares | 0 |  |  |
Converted to equity settled PRSUs | shares | 2,003,100 |  |  |
Outstanding, end of period | shares | 2,003,100 | 0 |  |
Weighted Average Fair Value of PRSUs |  |  |  |
Outstanding, beginning of period | $ / shares | $ 0.00 |  |  |
Converted to equity settled PRSUs | $ / shares | 21.95 |  |  |
Outstanding, end of period | $ / shares | $ 21.95 | $ 0.00 |  |
Successor | Cash-settled PRSUs |  |  |  |
Number of PRSUs |  |  |  |
Outstanding, beginning of period | shares | 1,539.2 |  |  |
Granted | shares | 36.7 |  |  |
Forfeited | shares | (20.2) |  |  |
Converted to equity settled PRSUs | shares | (1,033.2) |  |  |
Outstanding, end of period | shares | 522.5 | 1,539.2 |  |
Weighted Average Fair Value of PRSUs |  |  |  |
Outstanding, beginning of period | $ / shares | $ 38,017 |  |  |
Granted | $ / shares | 42,892 |  |  |
Forfeited | $ / shares | 34,891 |  |  |
Converted to equity settled PRSUs | $ / shares | 42,696 |  |  |
Outstanding, end of period | $ / shares | $ 34,221 | $ 38,017 |  |
Predecessor |  |  |  |
Share-Based Compensation Plans |  |  |  |
Employee equity compensation payable | $ |  |  | $ 31,019,000 |
Members' capital | $ |  |  | $ 999,735,000 |
Predecessor | Cash-settled PRSUs |  |  |  |
Number of PRSUs |  |  |  |
Outstanding, beginning of period | shares | 1,539.2 | 1,577.6 | 1,074.6 | 574.7
Granted | shares |  | 531.9 | 511.7 | 512.8
Exercised | shares |  | (560.4) |  |
Forfeited | shares |  | (9.9) | (8.7) | (12.9)
Outstanding, end of period | shares |  | 1,539.2 | 1,577.6 | 1,074.6
Weighted Average Fair Value of PRSUs |  |  |  |
Outstanding, beginning of period | $ / shares | $ 38,017 | $ 31,039 | $ 13,159 | $ 22,512
Granted | $ / shares |  | 29,609 | 24,911 | 21,723
Exercised | $ / shares |  | 32,246 |  |
Forfeited | $ / shares |  | 31,130 | 26,770 | 23,170
Outstanding, end of period | $ / shares |  | $ 38,017 | $ 31,039 | $ 13,159

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