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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, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Commissions	[1]	$ 195,909	$ 213,614
Investment banking	[1]	254,846	339,288
Revenue from contracts with customers	[1]	801,478	854,022
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	73,450	208,806
Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	181,396	130,482
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	341,636	278,147
Interest [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	6,912	6,091
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	2,175	16,882
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions	[1]	130,776	147,505
Investment banking	[1]	5,147	13,549
Revenue from contracts with customers	[1]	486,522	460,143
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	5,147	13,549
Global Wealth Management [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	0
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	341,613	278,109
Global Wealth Management [Member] | Interest [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	6,864	6,056
Global Wealth Management [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	2,122	14,924
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions	[1]	65,133	66,109
Investment banking	[1]	249,699	325,739
Revenue from contracts with customers	[1]	314,903	391,921
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	68,303	195,257
Institutional Group [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	181,396	130,482
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	23	38
Institutional Group [Member] | Interest [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	48	35
Institutional Group [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	0
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	53	1,958
Other [Member] | Interest [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	0	0
Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	53
Other	[1]		1,958
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	749,172	765,951
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	486,522	460,143
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	262,597	303,850
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	53	1,958
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	34,308	45,391
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	34,308	45,391
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	8,620	12,901
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	8,620	12,901
Canada [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	9,378	29,779
Canada [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	[1]	$ 9,378	$ 29,779
[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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