Related Party Transactions - Revenues for Services Provided (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Other revenues	$ 105,544	$ 108,409	$ 104,703
Mutual Funds
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	2,130,998	2,375,944	1,972,531
Other revenues	8,366	8,364	8,314
Investment advisory and services fees
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	2,971,038	3,194,524	2,595,436
Investment advisory and services fees | Mutual Funds
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	1,452,885	1,644,757	1,368,484
Distribution revenues | Mutual Funds
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	590,580	637,076	516,336
Shareholder servicing fees | Mutual Funds
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	79,167	85,745	79,394
Bernstein research services
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	416,273	452,017	459,744
Bernstein research services | Mutual Funds
Related Party Transaction [Line Items]
Revenue subject to contracts with customers	$ 0	$ 2	$ 3