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Revenues from Contracts with Customers (Revenues from Contracts with Customers Disaggregated by Major Business Activity and Primary Geographic Regions) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Commissions	[1]	$ 169,550	$ 195,909
Investment banking	[1]	211,879	254,846
Revenue from contracts with customers	[1]	698,225	794,566
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	60,816	73,450
Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	151,063	181,396
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	315,569	341,636
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	1,227	2,175
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions	[1]	110,191	130,776
Investment banking	[1]	4,158	5,147
Revenue from contracts with customers	[1]	431,070	479,658
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	4,158	5,147
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	315,537	341,613
Global Wealth Management [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	1,184	2,122
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions	[1]	59,359	65,133
Investment banking	[1]	207,721	249,699
Revenue from contracts with customers	[1]	267,112	314,855
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	56,658	68,303
Institutional Group [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	151,063	181,396
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	32	23
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	43	53
Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Other	[1]	43	53
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	641,990	742,297
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	431,070	479,658
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	210,877	262,586
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	43	53
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	23,383	34,308
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	23,383	34,308
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	10,329	8,620
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	10,329	8,620
Canada [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	22,523	9,341
Canada [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	$ 22,523	$ 9,341
[1] Excludes revenues not derived from contracts with customers included in the Other segment.

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Amount of commission revenue from buying and selling securities on behalf of customers.

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Includes (1) underwriting revenue (the spread between the resale price received and the cost of the securities and related expenses) generated through the purchasing, distributing and reselling of new issues of securities (alternatively, could be a secondary offering of a large block of previously issued securities); and (2) fees earned for mergers, acquisitions, divestitures, restructurings, and other types of financial advisory services.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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