Investment in AB (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Change in Equity Method Investment [Roll Forward]
Beginning balance			$ 2,074,626
Equity in net income attributable to AB Unitholders	$ 69,121	$ 75,358	145,503	$ 169,711
Changes in accumulated other comprehensive income	1,885	$ (11,395)	4,521	(15,599)
Cash distributions received from AB			(171,308)	$ (235,075)
Capital contributions (from) AB			(2,030)
AB Holding Units retired			(17,424)
AB Holding Units issued to fund long-term incentive compensation plans			7,687
Change in AB Holding Units held by AB for long-term incentive compensation plans			2,399
Ending balance	$ 2,043,974		$ 2,043,974