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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		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Commissions		$ 667,494	$ 657,732
Investment banking		817,421	707,670
Revenue from contracts with customers		2,352,237	2,187,145
Other		19,287	15,568
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	369,442	336,188
Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	447,979	371,482
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		848,035	806,175	$ 702,064
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions		477,401	472,135
Investment banking		37,915	31,374
Revenue from contracts with customers		1,379,730	1,321,266
Other		16,437	11,625
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	37,915	31,293
Global Wealth Management [Member] | Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]		81
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		847,977	806,132
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions		190,093	185,597
Investment banking		779,506	676,296
Revenue from contracts with customers		969,657	861,936
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	331,527	304,895
Institutional Group [Member] | Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	447,979	371,401
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		58	43
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		2,850	3,943
Other		2,850	3,943
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		2,205,338	2,050,460
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,379,730	1,321,266
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		822,758	725,251
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		2,850	3,943
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		135,529	130,979
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		135,529	130,979
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		11,370	5,706
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		$ 11,370	$ 5,706
[1] Excludes revenues not derived from contracts with customers 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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-Topic 940
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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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