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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		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Commissions		$ 164,981	$ 166,902	$ 320,430	$ 332,677
Investment banking		179,617	161,083	341,457	337,445
Revenue from contracts with customers		559,517	531,349	1,075,855	1,073,005
Other		3,748	3,796	7,530	7,514
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	96,712	74,080	153,657	152,769
Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	82,905	87,003	187,800	184,676
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		211,171	199,568	406,438	395,369
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions		120,284	118,129	230,211	237,334
Investment banking		10,559	8,049	18,782	15,737
Revenue from contracts with customers		345,548	328,642	661,406	654,010
Other		3,549	2,907	6,004	5,593
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	10,559	7,968	18,782	15,656
Global Wealth Management [Member] | Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]		81		81
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		211,156	199,557	406,409	395,346
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions		44,697	48,773	90,219	95,343
Investment banking		169,058	153,034	322,675	321,708
Revenue from contracts with customers		213,770	201,818	412,923	417,074
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	86,153	66,112	134,875	137,113
Institutional Group [Member] | Advisory Fees [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	82,905	86,922	187,800	184,595
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		15	11	29	23
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		199	889	1,526	1,921
Other		199	889	1,526	1,921
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		518,705	502,946	1,012,630	1,005,696
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		345,548	328,642	661,406	654,010
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		172,958	173,415	349,698	349,765
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		199	889	1,526	1,921
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		39,668	25,953	60,771	63,832
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		39,668	25,953	60,771	63,832
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,144	2,450	2,454	3,477
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		$ 1,144	$ 2,450	$ 2,454	$ 3,477
[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
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
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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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