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Consolidated Statements of Income (Parenthetical) - 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
Successor
Revenues
General and administrative from related parties	$ 180
Technology and communications from related parties	740
Occupancy from related parties	155
Interest income from related parties	17
Successor | Transaction Fee Revenue
Revenues
Revenue from related parties	59,259
Successor | Subscription Fee Revenue
Revenues
Revenue from related parties	5,718
Successor | Commissions Revenue
Revenues
Revenue from related parties	$ 12,401
Predecessor
Revenues
General and administrative from related parties		$ 539	$ 719	$ 740
Technology and communications from related parties		2,220	2,960	2,960
Occupancy from related parties		466	621	600
Interest income from related parties		34	40	80
Predecessor | Transaction Fee Revenue
Revenues
Revenue from related parties		159,663	151,695	134,231
Predecessor | Subscription Fee Revenue
Revenues
Revenue from related parties		16,627	37,426	35,169
Predecessor | Commissions Revenue
Revenues
Revenue from related parties		$ 34,944	$ 43,315	$ 42,343

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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