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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Tradeweb Markets LLC |
Entity Information [Line Items] |
Net Income Per Share |
|  | Successor |  |  | Predecessor |  | Predecessor |  |  | Predecessor
|  | October 1, |  |  | January 1, |  | Year |  |  | Year
|  | 2018 to |  |  | 2018 to |  | Ended |  |  | Ended
|  | December 31, 2018 |  |  | September 30, 2018 |  | December 31, 2017 |  |  | December 31, 2016
Net Income (in thousands) |  | $ | 29,307 |  |  | $ | 130,160 |  | $ | 83,648 |  |  | $ | 93,161
Basic Weighted Average Shares Outstanding |  |  | 222,221,628 |  |  |  | 215,365,920 |  |  | 212,568,635 |  |  |  | 210,979,704
Dilutive Effect of Conversion to Equity Settled PRSU |  |  | 22,223 |  |  |  | — |  |  | — |  |  |  | —
Diluted Weighted Average Shares Outstanding |  |  | 222,243,851 |  |  |  | 215,365,920 |  |  | 212,568,635 |  |  |  | 210,979,704
Basic Net Income Per Share |  | $ | 0.13 |  |  | $ | 0.60 |  | $ | 0.39 |  |  | $ | 0.44
Diluted Net Income Per Share |  | $ | 0.13 |  |  | $ | 0.60 |  | $ | 0.39 |  |  | $ | 0.44

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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