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Tax Receivable Agreement (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Apr. 08, 2019
Tax Receivable Agreement |  |
Percentage of amount of U.S. federal, state and local income or franchise tax savings | 50.00% |
Tax receivable agreement liability | $ 240,817 | $ 171,400
Tax receivable agreement liability adjustment | $ 33,134 |

X
- Definition The carrying amount as on the balance sheet date of tax receivable agreement liability. + References No definition available. + Details
Name: | tw_TaxReceivableAgreementLiability
Namespace Prefix: | tw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | tw_TaxReceivableAgreementLiabilityAbstract
Namespace Prefix: | tw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the adjustments related to tax receivable agreement liability. + References No definition available. + Details
Name: | tw_TaxReceivableAgreementLiabilityAdjustment
Namespace Prefix: | tw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of amount of U.S. federal, state and local income or franchise tax savings under the tax receivable agreement. + References No definition available. + Details
Name: | tw_TaxReceivableAgreementPercentageOfAmountOfFederalStateAndLocalIncomeOrFranchiseTaxSavings
Namespace Prefix: | tw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration