Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Thousands, shares in Millions				4 Months Ended	12 Months Ended
	Nov. 22, 2022	Nov. 01, 2022	Jul. 01, 2022	Nov. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Payables recorded under contingent payment arrangements						$ 247,309	$ 38,260
Cash acquired from acquisition						40,800	2,800	$ 600
Business combination, deferred tax assets			$ 5,073
Goodwill						3,598,591	$ 3,091,763
Interest in the joint venture, with an option	100.00%
Option to acquire controlling interest in joint venture, term	5 years
Discontinued Operations, Held-for-sale
Business Acquisition [Line Items]
Valuation adjustment (allowance) on disposal group						(7,400)
Cash and cash equivalents						159,123
Forecast
Business Acquisition [Line Items]
Interest in the joint venture hold					49.00%
Societe Generale | Forecast | Joint Venture
Business Acquisition [Line Items]
Interest in the joint venture					51.00%
CarVal
Business Acquisition [Line Items]
Transaction agreement to acquire (as percent)			100.00%
Assets under management			$ 12,200,000
Equity interest contributed to affiliate			100.00%
Business acquisition, equity interest issued (in shares)		12.1	3.2	15.3
Fair value of AB Holding Units issued		$ 456,400	$ 132,800	$ 589,200
Payables recorded under contingent payment arrangements			$ 228,900
Business combination, contingent consideration, performance term			6 years
Business combination, excess purchase price over fair value			$ 156,100
Cash acquired from acquisition			40,800
Business combination, deferred tax assets			5,100
Goodwill			666,130			$ 666,100
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles			$ 303,000
CarVal | Minimum | Investment Management Contracts and Investor Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			5 years
CarVal | Maximum | Investment Management Contracts and Investor Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			10 years