XML 40 R32.htm IDEA: XBRL DOCUMENT
v3.19.2

Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Tradeweb Markets LLC |
Entity Information [Line Items] |
Breakdown of revenues between fixed and variable revenues | The breakdown of revenues between fixed and variable revenues, in thousands, for October 1, 2018 to December 31, 2018, January 1, 2018 to September 30, 2018 and for the year ended December 31, 2017 and 2016 is as follows:
|  | Successor |  |  | Predecessor
|  | October 1, 2018 to |  |  | January 1, 2018 to |  | For the Year Ended |  | For the Year Ended
|  | December 31, 2018 |  |  | September 30, 2018 |  | December 31, 2017 |  | December 31, 2016
|  | (in thousands) |  |  | (in thousands) |  | (in thousands) |  | (in thousands)
Revenues | Variable |  | Fixed |  |  | Variable |  | Fixed |  | Variable |  | Fixed |  | Variable |  | Fixed
Transaction fees |  | $ | 73,800 |  | $ | 23,330 |  |  | $ | 208,049 |  | $ | 65,702 |  | $ | 210,198 |  | $ | 56,822 |  | $ | 176,060 |  | $ | 54,111
Subscription fees including Refinitiv market data fees |  |  | 425 |  |  | 46,094 |  |  |  | 1,305 |  |  | 142,676 |  |  | 1,575 |  |  | 192,959 |  |  | 1,496 |  |  | 190,487
Commissions |  |  | 22,608 |  |  | 10,232 |  |  |  | 49,367 |  |  | 30,463 |  |  | 57,118 |  |  | 39,627 |  |  | 54,194 |  |  | 37,469
Other |  |  | — |  |  | 2,148 |  |  |  | 40 |  |  | 8,169 |  |  | 36 |  |  | 4,633 |  |  | 30 |  |  | 4,557
Gross revenues |  | $ | 96,833 |  | $ | 81,804 |  |  | $ | 258,761 |  | $ | 247,010 |  | $ | 268,927 |  | $ | 294,041 |  | $ | 231,780 |  | $ | 286,624

X
- 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
Name: | dei_EntityInformationLineItems
Namespace Prefix: | dei_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=tw_TradewebMarketsLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |