Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 266,392	$ 351,026	$ 695,374	$ 890,733
Other comprehensive income (loss):
Foreign currency translation adjustment, before reclassification and tax	(7,297)	18,677	29,730	6,789
Less: reclassification adjustment for (losses) included in net income upon liquidation	0	0	0	(10,197)
Foreign currency translation adjustments, before tax	(7,297)	18,677	29,730	16,986
Income tax (expense)	(149)	(163)	(334)	(108)
Foreign currency translation adjustments, net of tax	(7,446)	18,514	29,396	16,878
Changes in employee benefit related items:
Amortization of prior service cost	0	6	611	18
Recognized actuarial gain	0	105	0	664
Less: reclassification adjustment for (losses) included in net income upon retirement plan liquidation	0	0	(22,898)	0
Changes in employee benefit related items	0	111	23,509	682
Income tax (expense)	0	(1)	(147)	(8)
Employee benefit related items, net of tax	0	110	23,362	674
Other comprehensive (loss) income	(7,446)	18,624	52,758	17,552
Less: Comprehensive income in consolidated entities attributable to non-controlling interests	7,129	5,054	4,845	17,262
Comprehensive income attributable to AB Unitholders	$ 251,817	$ 364,596	$ 743,287	$ 891,023