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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 519,088	$ 551,187	$ 1,122,255	$ 1,095,938
Rates [Member]
Segment Reporting Information [Line Items]
Total revenues	133,034	152,959	300,274	308,570
Credit [Member]
Segment Reporting Information [Line Items]
Total revenues	95,780	78,166	192,969	163,893
FX [Member]
Segment Reporting Information [Line Items]
Total revenues	74,393	101,899	168,759	203,457
Energy and Commodities [Member]
Segment Reporting Information [Line Items]
Total revenues	71,326	73,887	155,064	144,229
Insurance [Member]
Segment Reporting Information [Line Items]
Total revenues	45,783	41,417	90,619	72,821
Equities [Member]
Segment Reporting Information [Line Items]
Total revenues	61,777	65,078	143,574	134,848
Brokerage [Member]
Segment Reporting Information [Line Items]
Total revenues	482,093	513,406	1,051,259	1,027,818
All Other Revenues [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 36,995	$ 37,781	$ 70,996	$ 68,120

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

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