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Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Changes in goodwill
Balance at the beginning of the period	$ 836,583
Goodwill recognized in ITG Acquisition	357,334
Currency translation adjustment	(220)
Balance at the end of the period	1,193,697
Market Making
Changes in goodwill
Balance at the beginning of the period	755,292
Goodwill recognized in ITG Acquisition	0
Currency translation adjustment	0
Balance at the end of the period	755,292
Execution Services
Changes in goodwill
Balance at the beginning of the period	81,291
Goodwill recognized in ITG Acquisition	357,334
Currency translation adjustment	(220)
Balance at the end of the period	438,405
Corporate
Changes in goodwill
Balance at the beginning of the period	0
Goodwill recognized in ITG Acquisition	0
Currency translation adjustment	0
Balance at the end of the period	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

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+ References

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