Business Segment Information - Net Revenues Derived From Investment Management, Research and Related Services (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	$ 4,445,288	$ 3,724,186	$ 3,575,637
Less: Interest expense	3,686	15,650	57,205
Net revenues	4,441,602	3,708,536	3,518,432
Institutions
Revenues:
Total revenues	587,017	512,914	480,144
Retail
Revenues:
Total revenues	2,223,829	1,811,948	1,619,832
Private Wealth Management
Revenues:
Total revenues	1,126,142	882,672	904,505
Bernstein Research Services
Revenues:
Total revenues	452,017	459,744	407,911
Other
Revenues:
Total revenues	$ 56,283	$ 56,908	$ 163,245