Significant Accounting Policies (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2016	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Total Assets		$ 3,620,923	$ 3,370,888	$ 3,802,657
Total Liabilities		1,894,505		2,167,376
Retained Earnings		$ (1,726,418)	(1,489,374)	(1,635,281)		$ (1,126,250)
Investment Banking And Investment Management Receivables Collection Periods		90 days
Placement Fees Receivables Collection Period		180 days
Private Funds Capital Raising and Private Capital Receivables Collection Period		1 year
Restructuring Receivables Collection Period		90 days
Receivables Reflected in Other Assets in Excess of Period		1 year
Contract Asset Recognized For Cost of Obtaining Contract With Benefit in Excess of Period		1 year
Expense Recognized For Cost of Obtaining Contract With Amortization Less Than Period		1 year
Revision of Prior Period, Reclassification, Adjustment | Commissions and Related Revenue [Member]
Significant Accounting Policies [Line Items]
Revenue from Contract with Customer			925
Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		7 years
Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Retained Earnings		$ (1,768,098)	$ (798,573)	(1,418,382)		$ (558,269)
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Significant Accounting Policies [Line Items]
Retained Earnings					$ 1,310
LP Units [Member]
Significant Accounting Policies [Line Items]
Limited Partnership Units Convertible Conversion Ratio	1	1
Variable Interest Entity, Primary Beneficiary [Member]
Significant Accounting Policies [Line Items]
Total Assets		$ 584,192		446,736
Total Liabilities		$ 247,884		$ 260,426