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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Total revenues | $ 544,751 | $ 524,774
Rates [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 163,789 | 160,772
Credit [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 85,727 | 82,050
Foreign Exchange [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 93,380 | 99,050
Energy and Commodities [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 69,865 | 60,149
Equities, Insurance, and Other Asset Classes [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 100,989 | 97,754
Brokerage [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 513,750 | 499,775
All Other Revenue [Member] |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 31,001 | $ 24,999

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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=115205541&loc=SL114868664-224227 Reference 3: 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 4: 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 + Details
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