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Consolidated Statements of Changes in Members' Capital and Accumulated Other Comprehensive Loss - Tradeweb Markets LLC - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Predecessor |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Members' capital beginning of period | $ 1,125,165 | $ 986,468 | $ 1,024,759 | $ 1,067,944
Comprehensive income: |  |  |  |
Net income |  | 130,160 | 83,648 | 93,161
Foreign currency translation adjustments |  | (3,064) | 2,885 | (4,679)
Comprehensive income |  | 127,096 | 86,533 | 88,482
Adjustment to Class C Shares and Class P(C) Shares in mezzanine capital |  | 456 | (2,109) | (1,667)
Vesting of contingent consideration |  | 150,495 |  |
Capital contributions |  |  | 29,285 |
Capital distributions |  | (139,350) | (152,000) | (130,000)
Members' capital end of period |  | 1,125,165 | 986,468 | 1,024,759
Predecessor | Members' Capital |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Members' capital beginning of period | 1,141,496 | 999,735 | 1,040,911 | 1,079,417
Comprehensive income: |  |  |  |
Net income |  | 130,160 | 83,648 | 93,161
Comprehensive income |  | 130,160 | 83,648 | 93,161
Adjustment to Class C Shares and Class P(C) Shares in mezzanine capital |  | 456 | (2,109) | (1,667)
Vesting of contingent consideration |  | 150,495 |  |
Capital contributions |  |  | 29,285 |
Capital distributions |  | (139,350) | (152,000) | (130,000)
Members' capital end of period |  | 1,141,496 | 999,735 | 1,040,911
Predecessor | Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Members' capital beginning of period | (16,331) | (13,267) | (16,152) | (11,473)
Comprehensive income: |  |  |  |
Foreign currency translation adjustments |  | (3,064) | 2,885 | (4,679)
Comprehensive income |  | (3,064) | 2,885 | (4,679)
Members' capital end of period |  | (16,331) | $ (13,267) | $ (16,152)
Successor |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Members' capital beginning of period | 4,562,154 |  |  |
Comprehensive income: |  |  |  |
Net income | 29,307 |  |  |
Foreign currency translation adjustments | (866) |  |  |
Comprehensive income | 28,441 |  |  |
Adjustment to Class C Shares and Class P(C) Shares in mezzanine capital | (1,333) |  |  |
Conversion of certain cash-settled PRSUs to equity settled PRSUs | 19,072 |  |  |
Capital distributions | (36,000) |  |  |
Members' capital end of period | 4,572,334 | 4,562,154 |  |
Successor | Members' Capital |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Members' capital beginning of period | 4,562,154 |  |  |
Comprehensive income: |  |  |  |
Net income | 29,307 |  |  |
Comprehensive income | 29,307 |  |  |
Adjustment to Class C Shares and Class P(C) Shares in mezzanine capital | (1,333) |  |  |
Conversion of certain cash-settled PRSUs to equity settled PRSUs | 19,072 |  |  |
Capital distributions | (36,000) |  |  |
Members' capital end of period | 4,573,200 | 4,562,154 |  |
Successor | Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Members' capital beginning of period | 0 |  |  |
Comprehensive income: |  |  |  |
Foreign currency translation adjustments | (866) |  |  |
Comprehensive income | (866) |  |  |
Members' capital end of period | $ (866) | $ 0 |  |

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