Description of the Business - Narrative (Details)			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 03, 2023 shares	Jan. 03, 2023 segment	Jun. 30, 2024 USD ($) $ / shares shares	Mar. 31, 2023 shares	Jun. 30, 2024 USD ($) fund segment category $ / shares shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	May 17, 2024 shares	Mar. 27, 2024 shares	Mar. 06, 2024 USD ($)	Jan. 09, 2024 USD ($)	Jun. 07, 2023 shares	Jan. 02, 2023 $ / shares
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Assets under management			$ 71,900,000,000		$ 71,900,000,000
Warrant, exercise price (in dollars per share) | $ / shares														$ 11.50
Number of securities called by warrants or rights (in shares) | shares													19,892,387
Adjustments to additional paid in capital						$ 29,500,000
Warrants, outstanding (in shares) | shares			0		0		0
Number of operating segments | segment		2			2
Number of operating segments, number of revenue generating categories | category					3
Impairment loss on goodwill and intangible assets			$ 700,000		$ 695,000		$ 52,918,000
Wealth Management
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Assets under advisement			55,900,000,000		55,900,000,000		51,000,000,000.0
Strategic Alternatives | Alternatives platform
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Assets under advisement			7,300,000,000		7,300,000,000		7,600,000,000
Strategic Alternatives | Real Estate Fund Management
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Assets under advisement			$ 8,600,000,000		$ 8,600,000,000		12,700,000,000
Number of funds managed | fund					2
Strategic Alternatives | Real Estate Fund Management | LondonMetric Property Plc | Disposal group, disposed of by sale, not discontinued operations | LXi Reit Advisors Limited (“LRA”)
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership percentage in disposed asset (in percent)												100.00%
Consideration receivable											$ 33,100,000	$ 33,100,000
Contingent consideration receivable											$ 5,100,000	$ 5,100,000
Impairment loss on goodwill and intangible assets							23,500,000
Gain (loss) on disposal					$ 0
Constellation warrant
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Warrant, exercise price (in dollars per share) | $ / shares			$ 7.40		$ 7.40
Class A Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Total voting power (in percent)			55.60%		55.60%
Issuance of shares - exercise of warrants (in shares) | shares	78,864			428,626
Number of securities called by warrants or rights (in shares) | shares			4,962,221		4,962,221								4,962,147
Class A Common Stock | Constellation warrant
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Issuance of shares - exercise of warrants (in shares) | shares					0
Number of securities called by warrants or rights (in shares) | shares			2,000,000		2,000,000				466,667	1,533,333
Class B Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Total voting power (in percent)			36.90%		36.90%
Series C Cumulative Convertible Preferred Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Preferred stock, dividend rate (in percent)					9.75%
Preferred stock, dividend rate, per-dollar amount (in dollars per share) | $ / shares					$ 1,000
Preferred stock, total voting power (in percent)			7.50%		7.50%
Series C Cumulative Convertible Preferred Stock | Maximum
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Preferred stock, dividend rate (in percent)					9.75%
Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”) | Strategic Alternatives | Alvarium RE Limited ("ARE")
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment loss on goodwill and intangible assets							$ 29,400,000
Umbrella
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Voting interest acquired (in percent)		51.00%
Umbrella | TWMH and TIG Shareholders
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Voting interest acquired (in percent)		49.00%
TWMH, TIG, and Alvarium | Umbrella
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Voting interest acquired (in percent)		100.00%
Alvarium Home REIT Advisors Ltd ("AHRA") | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”) | Strategic Alternatives | Real Estate Fund Management | Alvarium RE Limited ("ARE")
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Voting interest to be acquired (in percent)								100.00%
Price of acquisition, expected								$ 29,000,000