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Investment in AB (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Change in Equity Method Investment [Roll Forward]
Beginning balance			$ 2,034,632
Equity in net income attributable to AB Unitholders	$ 78,830	$ 122,705	161,583	$ 208,986
Changes in accumulated other comprehensive income	9,779	$ 3,692	22,550	(467)
Cash distributions received from AB			(224,636)	$ (190,939)
Capital contributions (from) AB			(1,307)
AB Holding Units retired			(39,388)
AB Holding Units issued to fund long-term incentive compensation plans			39,565
Change in AB Holding Units held by AB to fund long-term incentive compensation plans			(12,019)
Ending balance	$ 1,980,980		$ 1,980,980

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