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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 2,104,231	$ 1,937,810	$ 1,750,951
Rates [Member]
Segment Reporting Information [Line Items]
Total revenues	594,884	549,825	510,880
Credit [Member]
Segment Reporting Information [Line Items]
Total revenues	306,713	292,171	284,551
FX [Member]
Segment Reporting Information [Line Items]
Total revenues	370,318	396,256	324,386
Energy and Commodities [Member]
Segment Reporting Information [Line Items]
Total revenues	286,584	228,199	204,016
Equities, Insurance, and Other Asset Classes [Member]
Segment Reporting Information [Line Items]
Total revenues	409,242	358,124	328,406
Brokerage [Member]
Segment Reporting Information [Line Items]
Total revenues	1,967,741	1,824,575	1,652,239
All Other Revenue [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 136,490	$ 113,235	$ 98,712

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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- 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

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