Investment in AB (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Change in Equity Method Investment [Roll Forward]
Beginning balance	$ 2,074,626
Equity in net income attributable to AB Unitholders	76,382	$ 94,353
Changes in accumulated other comprehensive income	2,636	(4,204)
Cash distributions received from AB	(87,343)	$ (136,714)
Capital contributions (from) AB	(1,324)
AB Holding Units retired	(15,956)
AB Holding Units issued to fund long-term incentive compensation plans	3,446
Change in AB Holding Units held by AB for long-term incentive compensation plans	498
Ending balance	$ 2,052,965

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