Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	$ 4,099,287	$ 4,405,040	$ 3,688,518
Dividend and interest income, net of interest expense	56,653	35,048	35,273
Investment (losses)	(102,413)	(636)	(16,401)
Other revenues	763	2,150	1,146
Revenue not subject to contract with customer	(44,997)	36,562	20,018
Net revenues	4,054,290	4,441,602	3,708,536
Base fees
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	2,825,791	2,949,405	2,462,810
Performance-based fees
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	145,247	245,119	132,626
Bernstein research services
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	416,273	452,017	459,744
All-in-management fees
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	290,740	350,674	331,268
12b-1 fees
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	69,041	83,920	75,973
Other distribution fees
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	247,414	217,646	122,540
Shareholder servicing fees
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	86,661	90,225	82,317
Other
Disaggregation of Revenue [Line Items]
Revenue subject to contracts with customers	$ 18,120	$ 16,034	$ 21,240