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Regulatory Capital Requirements (Details) - Tradeweb Markets LLC - Reportable Legal Entities - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Successor | TWL    
Regulatory Capital Requirements    
Regulatory Capital $ 18,986  
Regulatory Capital Requirement 2,698  
Excess Regulatory Capital 16,288  
Successor | DW    
Regulatory Capital Requirements    
Regulatory Capital 41,164  
Regulatory Capital Requirement 1,803  
Excess Regulatory Capital 39,361  
Successor | TWD    
Regulatory Capital Requirements    
Regulatory Capital 24,042  
Regulatory Capital Requirement 599  
Excess Regulatory Capital 23,443  
Successor | TEL    
Regulatory Capital Requirements    
Regulatory Capital 46,157  
Regulatory Capital Requirement 17,493  
Excess Regulatory Capital 28,664  
Successor | TWJ    
Regulatory Capital Requirements    
Regulatory Capital 10,592  
Regulatory Capital Requirement 3,413  
Excess Regulatory Capital 7,179  
Successor | TW SEF    
Regulatory Capital Requirements    
Financial Resources 31,232  
Required Financial Resources 10,500  
Excess Financial Resources 20,732  
Liquid Financial Assets 16,662  
Required Liquid Financial Assets 5,250  
Excess Liquid Financial Assets 11,412  
Successor | DW SEF    
Regulatory Capital Requirements    
Financial Resources 17,837  
Required Financial Resources 5,169  
Excess Financial Resources 12,668  
Liquid Financial Assets 11,888  
Required Liquid Financial Assets 2,585  
Excess Liquid Financial Assets $ 9,303  
Predecessor | TWL    
Regulatory Capital Requirements    
Regulatory Capital   $ 22,551
Regulatory Capital Requirement   1,589
Excess Regulatory Capital   20,962
Predecessor | DW    
Regulatory Capital Requirements    
Regulatory Capital   35,546
Regulatory Capital Requirement   1,612
Excess Regulatory Capital   33,934
Predecessor | TWD    
Regulatory Capital Requirements    
Regulatory Capital   16,965
Regulatory Capital Requirement   378
Excess Regulatory Capital   16,587
Predecessor | TEL    
Regulatory Capital Requirements    
Regulatory Capital   31,509
Regulatory Capital Requirement   18,034
Excess Regulatory Capital   13,475
Predecessor | TWJ    
Regulatory Capital Requirements    
Regulatory Capital   5,326
Regulatory Capital Requirement   961
Excess Regulatory Capital   4,365
Predecessor | TW SEF    
Regulatory Capital Requirements    
Financial Resources   23,349
Required Financial Resources   10,500
Excess Financial Resources   12,849
Liquid Financial Assets   14,084
Required Liquid Financial Assets   5,250
Excess Liquid Financial Assets   8,834
Predecessor | DW SEF    
Regulatory Capital Requirements    
Financial Resources   20,069
Required Financial Resources   5,875
Excess Financial Resources   14,194
Liquid Financial Assets   13,865
Required Liquid Financial Assets   2,893
Excess Liquid Financial Assets   $ 10,972