Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 788,619	$ 775,457	$ 1,153,734
Other comprehensive income:
Foreign currency translation adjustments, before reclassification and tax:	14,262	(47,208)	(7,839)
Less: reclassification adjustment for (losses) gains included in net income upon liquidation	(389)	0	4,458
Foreign currency translation adjustments, before tax	14,651	(47,208)	(12,297)
Income tax (expense) benefit	(618)	1,215	457
Foreign currency translation adjustments, net of tax	14,033	(45,993)	(11,840)
Changes in employee benefit related items:
Amortization of prior service cost	24	24	24
Recognized actuarial gain	9,135	6,922	15,743
Changes in employee benefit related items	9,159	6,946	15,767
Income tax (expense)	(79)	(95)	(59)
Employee benefit related items, net of tax	9,080	6,851	15,708
Other comprehensive gain (loss)	23,113	(39,142)	3,868
Less: Comprehensive income (loss) in consolidated entities attributable to non-controlling interests	24,009	(56,356)	5,111
Comprehensive income attributable to AB Unitholders	$ 787,723	$ 792,671	$ 1,152,491