Acquisition - Identified Assets Acquired and Liabilities (Details) - USD ($) $ in Thousands	Jul. 01, 2022	Sep. 30, 2022	Dec. 31, 2021
Assets acquired:
Goodwill		$ 3,719,880	$ 3,091,763
CarVal Investors, L.P.
Business Acquisition [Line Items]
Fair value of AB Holding units issued	$ 552,196
Fair value of contingent consideration	227,071
Total purchase consideration	779,267
Assets acquired:
Cash and cash equivalents	40,777
Receivables, net	82,523
Investments - other	947
Furniture, equipment, and leasehold improvements, net	2,464
Right-of-use assets	16,482
Other assets	14,230
Deferred tax asset	4,823
Intangible assets	303,000
Goodwill	627,593	$ 627,600
Total assets acquired	1,092,839
Liabilities assumed:
Accounts payable and accrued expenses	(33,134)
Accrued compensation and benefits	(208,015)
Debt	(42,661)
Lease liabilities	(16,571)
Non-redeemable non-controlling interests in consolidated entities	(13,191)
Total liabilities assumed	(313,572)
Net assets acquired	$ 779,267