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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, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Commissions (1)		$ 211,098	$ 155,449
Investment banking		179,468	161,840
Revenue from contracts with customers		633,108	516,338
Other		4,767	3,782
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	103,396	56,945
Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	76,072	104,895
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		237,775	195,267
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions (1)		136,897	109,927
Investment banking		10,333	8,223
Revenue from contracts with customers		388,991	315,858
Other		4,001	2,455
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	10,314	8,223
Global Wealth Management [Member] | Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	19
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		237,760	195,253
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions (1)		74,198	45,522
Investment banking		169,135	153,617
Revenue from contracts with customers		243,348	199,153
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	93,082	48,722
Institutional Group [Member] | Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	76,053	104,895
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		15	14
Other [Member]
Disaggregation Of Revenue [Line Items]
Commissions (1)		3
Revenue from contracts with customers		769	1,327
Other		766	1,327
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		587,803	493,925
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		388,991	315,858
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		198,043	176,740
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		769	1,327
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		30,763	21,103
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		30,763	21,103
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		14,542	1,310
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		$ 14,542	$ 1,310
[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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-Publisher FASB
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-Topic 940
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 606
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