Investment in AB (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Change in Equity Method Investment [Roll Forward]
Beginning balance			$ 1,623,764
Equity in net income attributable to AB Unitholders	$ 63,905	$ 95,921	233,616	$ 282,235
Changes in accumulated other comprehensive (loss)	(11,495)	$ (3,014)	(27,094)	(5,005)
Cash distributions received from AB			(313,438)	(290,773)
Additional investments with proceeds from exercise of compensatory options to buy AB Holding Units			178	$ 3,402
Capital contributions (from) AB			(312)
AB Holding Units retired			(114,794)
AB Holding Units issued to fund long-term incentive compensation plans			32,452
AB Holding Units issued to fund CarVal acquisition			132,839
Change in AB Holding Units held by AB for long-term incentive compensation plans			3,145
Ending balance	$ 1,570,356		$ 1,570,356