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Investment in AB (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Change in Equity Method Investment [Roll Forward]
Beginning balance			$ 2,077,540
Equity in net income attributable to AB Unitholders	$ 136,374	$ 65,761	345,360	$ 211,264
Changes in accumulated other comprehensive income	7,588	$ (5,643)	7,121	(1,122)
Cash distributions received from AB			(281,164)	$ (248,529)
Capital contributions (from) AB			(902)
AB Holding Units retired			(66,477)
AB Holding Units issued to fund long-term incentive compensation plans			20,430
Change in AB Holding Units held by AB for long-term incentive compensation plans			(3,205)
Ending balance	$ 2,098,703		$ 2,098,703

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