Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,284,286	$ 1,217,932	$ 2,539,755	$ 2,380,970
Compensation and benefits		774,936	722,719	1,507,156	1,402,414
Non-compensation operating expenses		295,530	268,319	755,415	532,971
Income/(loss) before income taxes		213,820	226,894	277,184	445,585
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues		845,631	801,135	1,696,190	1,591,635
Compensation and benefits		420,240	392,941	842,533	782,477
Non-compensation operating expenses		119,335	109,021	421,196	219,237
Income/(loss) before income taxes		306,056	299,173	432,461	589,921
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues		419,779	390,721	804,708	742,097
Compensation and benefits		257,697	239,036	510,282	454,785
Non-compensation operating expenses		101,042	102,872	205,955	201,390
Income/(loss) before income taxes		61,040	48,813	88,471	85,922
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues		18,876	26,076	38,857	47,238
Compensation and benefits		96,999	90,742	154,341	165,152
Non-compensation operating expenses		75,153	56,426	128,264	112,344
Income/(loss) before income taxes		$ (153,276)	$ (121,092)	$ (243,748)	$ (230,258)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2025 and 2024.