Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 221,694	$ 225,955
Other comprehensive (loss) income:
Foreign currency translation adjustments, before tax	10,749	(10,309)
Income tax benefit	55	109
Foreign currency translation adjustments, net of tax	10,804	(10,200)
Changes in employee benefit related items:
Amortization of prior service cost	611	6
Recognized actuarial gain	0	669
Less: reclassification adjustment for (losses) included in net income upon retirement plan liquidation	(22,898)	0
Changes in employee benefit related items	23,509	675
Income tax (expense)	(147)	(5)
Employee benefit related items, net of tax	23,362	670
Other comprehensive income (loss)	34,166	(9,530)
Less: Comprehensive income in consolidated entities attributable to non-controlling interests	895	8,028
Comprehensive income attributable to AB Unitholders	$ 254,965	$ 208,397