Summary of Significant Accounting Policies - Additional Information (Details)			1 Months Ended		3 Months Ended			12 Months Ended
	Feb. 08, 2023 $ / shares	Jul. 01, 2022 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) reportingUnit $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares
Business Acquisition [Line Items]
Repledged securities			$ 267,100,000	$ 23,400,000	$ 267,100,000	$ 23,400,000		$ 267,100,000	$ 23,400,000
Collateral advances, allowance			0	0	0	0		0	0
Margin deposit assets				114,900,000		114,900,000			114,900,000
U.S. Treasury bills pledged as collateral			0	0	0	0		$ 0	0
Number of reporting units | reportingUnit								1
Goodwill			3,598,591,000	3,091,763,000	3,598,591,000	3,091,763,000		$ 3,598,591,000	3,091,763,000
Held for sale asset disposal group			159,800,000		159,800,000			159,800,000
Intangible assets, net of accumulated amortization			310,203,000	41,531,000	310,203,000	41,531,000		310,203,000	41,531,000
Finite-lived intangible assets subject to amortization, net			295,000,000	26,300,000	295,000,000	26,300,000		295,000,000	26,300,000
Indefinite-lived intangible assets not subject to amortization			15,200,000	15,200,000	15,200,000	15,200,000		15,200,000	15,200,000
Finite-lived intangible assets			327,900,000	53,800,000	327,900,000	53,800,000		327,900,000	53,800,000
Accumulated amortization of intangible assets			32,900,000	27,500,000	32,900,000	$ 27,500,000		32,900,000	27,500,000
Amortization of intangible assets								26,564,000	5,697,000	$ 21,372,000
2023			47,000,000		47,000,000			47,000,000
2024			47,000,000		47,000,000			47,000,000
2025			47,000,000		47,000,000			47,000,000
2026			46,000,000		46,000,000			46,000,000
2027			25,000,000		$ 25,000,000			$ 25,000,000
Deferred sales commission amortization period US fund (in years)								1 year
Deferred sales commission amortization period non US funds (in years)								4 years
Impairment of finite-lived intangible assets								$ 0	0
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]					General and administrative	General and administrative	General and administrative
Contingent payment arrangements			247,309,000	38,260,000	$ 247,309,000	$ 38,260,000		247,309,000	38,260,000
Impairment of contingent consideration payable								0
Assets held for sale			551,351,000	0	551,351,000	0		551,351,000	0
Liabilities held for sale			$ 107,952,000	$ 0	$ 107,952,000	0		$ 107,952,000	$ 0
Period over which receivables from brokers and dealers for sale of shares of company-sponsored mutual funds generally are realized								3 days
Maximum percentage of award an employee can elect to allocate to deferred cash			50.00%		50.00%			50.00%
Maximum amount of deferred cash			$ 250,000		$ 250,000			$ 250,000
Granted to employees and Eligible Directors | shares			3,800,000	3,400,000				4,700,000	7,000,000
Options exercised (in units) | shares								5,774	143,211
Proceeds from stock options exercised								$ 178,000	$ 3,402,000	147,000
Net foreign currency transaction gains (losses)								$ 10,200,000	$ 8,500,000	$ (3,300,000)
Cash distributions per unit paid to the General Partner and Unitholders (in dollars per unit) | $ / shares								$ 3.87	$ 3.86	$ 3.08
Subsequent Event
Business Acquisition [Line Items]
Cash distribution, distribution declared (in dollars per unit) | $ / shares	$ 0.77
AB Holding | AllianceBernstein Corporation
Business Acquisition [Line Items]
Percentage of General Partnership interest in company								1.00%
Director
Business Acquisition [Line Items]
Long-term incentive awards vesting periods								3 years
Employees based outside of the United States
Business Acquisition [Line Items]
Maximum percentage of award an employee can elect to allocate to deferred cash			100.00%		100.00%			100.00%
Maximum amount of deferred cash			$ 100,000		$ 100,000			$ 100,000
Sanford C Bernstein Inc Acquisition
Business Acquisition [Line Items]
Goodwill			2,800,000,000		2,800,000,000			2,800,000,000
Various smaller acquisitions
Business Acquisition [Line Items]
Goodwill			291,900,000		291,900,000			291,900,000
Ramius Alternative Solutions LLC
Business Acquisition [Line Items]
Impairment of finite-lived intangible assets						1,000,000	$ 1,500,000
Impairment of contingent consideration payable						$ (600,000)	$ (1,400,000)
CarVal
Business Acquisition [Line Items]
Ownership percentage		100.00%
Equity interest contributed to affiliate		100.00%
Goodwill		$ 666,130,000	$ 666,100,000		666,100,000			$ 666,100,000
Contingent payment arrangements		$ 228,900,000
Business combination, contingent consideration, performance term		6 years
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		$ 303,000,000
CPH Capital Fondsmaeglerselskab A/S
Business Acquisition [Line Items]
Impairment of finite-lived intangible assets					$ 5,600,000
Minimum
Business Acquisition [Line Items]
Intangible assets acquired, estimated useful life								5 years
Minimum | Employee
Business Acquisition [Line Items]
Long-term incentive awards vesting periods								3 years
Minimum | CarVal | Investment Management Contracts and Investor Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		5 years
Maximum
Business Acquisition [Line Items]
Intangible assets acquired, estimated useful life								20 years
Maximum | Employee
Business Acquisition [Line Items]
Long-term incentive awards vesting periods								4 years
Maximum | CarVal | Investment Management Contracts and Investor Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		10 years
Furniture
Business Acquisition [Line Items]
Useful life (in years)								8 years
Equipment | Minimum
Business Acquisition [Line Items]
Useful life (in years)								3 years
Equipment | Maximum
Business Acquisition [Line Items]
Useful life (in years)								6 years