Investment in AB (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Change in Equity Method Investment [Roll Forward]
Beginning balance			$ 1,623,764
Equity in net income attributable to AB Unitholders	$ 75,358	$ 97,407	169,711	$ 186,314
Changes in accumulated other comprehensive (loss)	(11,395)	$ 1,045	(15,599)	(1,991)
Cash distributions received from AB			(235,075)	(194,245)
Additional investments with proceeds from exercise of compensatory options to buy AB Holding Units	178		178	$ 3,402
Capital contributions to AB			373
AB Holding Units retired			(112,307)
AB Holding Units issued to fund long-term incentive compensation plans			31,457
Change in AB Holding Units held by AB for long-term incentive compensation plans			(237)
Ending balance	$ 1,462,265		$ 1,462,265

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