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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Commissions		$ 809,500	$ 760,627
Investment banking		1,565,381	952,308
Revenue from contracts with customers		3,615,636	2,678,888
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	709,298	524,157
Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	856,083	428,151
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,206,516	917,424	$ 848,035
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		34,239	48,529
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions		567,491	513,247
Investment banking		48,210	36,024
Revenue from contracts with customers		1,854,521	1,512,062
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	48,210	36,005
Global Wealth Management [Member] | Advisory [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		1,206,406	917,353
Global Wealth Management [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		32,414	45,438
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions		242,009	247,380
Investment banking		1,517,171	916,284
Revenue from contracts with customers		1,759,290	1,163,735
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	661,088	488,152
Institutional Group [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	[1]	856,083	428,132
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		110	71
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,825	3,091
Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,825	3,091
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		3,289,559	2,455,425
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,854,521	1,512,062
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,433,213	940,272
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		1,825	3,091
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		188,984	143,960
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		188,984	143,960
Canada [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		93,068	40,446
Canada [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		93,068	40,446
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		44,025	39,057
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers		$ 44,025	$ 39,057
[1] Excludes revenues not derived from contracts with customers in the Other segment.

X

- Definition

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

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