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Related Party Transactions - Balances (Details) - Tradeweb Markets LLC - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Successor    
Related Party Transactions    
Cash and cash equivalents $ 283,790,000  
Receivables from brokers and dealers and clearing organizations 3,332,000  
Deposits with clearing organizations 500,000  
Accounts receivable 40,730,000  
Receivable from affiliates 3,243,000  
Other assets 9,000  
Payable to brokers and dealers and clearing organizations 2,404,000  
Deferred revenue 9,151,000  
Payable to affiliates $ 5,009,000  
Predecessor    
Related Party Transactions    
Cash and cash equivalents   $ 234,107,000
Deposits with clearing organizations   500,000
Accounts receivable   27,163,000
Receivable from affiliates   375,000
Other assets   27,000
Deferred revenue   5,106,000
Contingent consideration payable   129,393,000
Accounts payable, accrued expenses and other liabilities   2,555,000
Payable to affiliates   $ 5,578,000