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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Commissions	$ 206,075	$ 183,445	$ 600,414	$ 552,238
Investment banking	323,483	243,182	794,885	690,412
Revenue from contracts with customers	962,627	810,892	2,644,035	2,377,946
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	144,213	106,325	350,840	302,892
Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	179,270	136,857	444,045	387,520
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	431,399	382,616	1,244,548	1,130,849
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	1,670	1,649	4,188	4,447
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions	141,864	129,230	395,893	371,912
Investment banking	6,529	6,217	18,661	16,277
Revenue from contracts with customers	581,270	519,405	1,662,987	1,523,132
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	6,529	6,217	18,661	16,277
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	431,363	382,309	1,244,443	1,130,496
Global Wealth Management [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	1,514	1,649	3,990	4,447
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions	64,211	54,215	204,521	180,326
Investment banking	316,954	236,965	776,224	674,135
Revenue from contracts with customers	381,201	291,487	980,850	854,814
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	137,684	100,108	332,179	286,615
Institutional Group [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	179,270	136,857	444,045	387,520
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	36	307	105	353
Institutional Group [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	0	0		0
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	156		198
Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	156		198
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	895,119	759,194	2,464,696	2,220,469
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	581,270	519,405	1,662,987	1,523,132
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	313,693	239,789	801,511	697,337
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	156		198
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	39,018	28,393	107,896	89,964
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	39,018	28,393	107,896	89,964
Canada [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	14,749	9,969	41,407	31,056
Canada [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	0	0
Canada [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	14,749	9,969	41,407	31,056
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	13,741	13,336	30,036	36,457
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 13,741	$ 13,336	$ 30,036	$ 36,457

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

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