Business Segment Information - Net Revenues Derived From Investment Management, Research and Related Services (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Total revenues	$ 4,262,864	$ 4,120,728	$ 4,445,288
Less: Broker-dealer related interest expense	107,541	66,438	3,686
Net revenues	4,155,323	4,054,290	4,441,602
Institutions
Revenues:
Total revenues	666,670	659,983	587,017
Retail
Revenues:
Total revenues	1,926,020	2,000,908	2,223,829
Private Wealth Management
Revenues:
Total revenues	1,052,843	1,004,003	1,126,142
Bernstein Research Services
Revenues:
Total revenues	386,142	416,273	452,017
Other
Revenues:
Total revenues	$ 231,189	$ 39,561	$ 56,283