Acquisition - Narrative (Details) - USD ($) $ in Thousands, shares in Millions			12 Months Ended
	Nov. 01, 2022	Jul. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Acquisition of business, net cash acquired			$ 0	$ 40,777	$ 0
CarVal Investors, L.P.
Business Acquisition [Line Items]
Percentage of interests acquired		100.00%
Assets under management		$ 12,200,000
Equity interest contributed to affiliate		100.00%
Business combination, equity interest issued (in shares)	12.1	3.2
Fair value of AB Holding Units issued	$ 456,400	$ 132,800
Business combination, excess purchase price over fair value		156,100
Acquisition of business, net cash acquired		40,800
Goodwill		671,203
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		$ 303,000
CarVal Investors, L.P. | AB
Business Acquisition [Line Items]
Business combination, equity interest issued (in shares)		15.3
Fair value of AB Holding Units issued		$ 589,200
Contingent consideration liability		$ 228,900
Business combination, contingent consideration, performance term		6 years
Goodwill		$ 666,100
Deferred tax assets		$ 5,100
CarVal Investors, L.P. | Minimum | Investment Management Contracts and Investor Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		5 years
CarVal Investors, L.P. | Maximum | Investment Management Contracts and Investor Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		10 years