Acquisitions - Summary of Allocation of Purchase Price (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jul. 01, 2019
Acquisitions
Goodwill	$ 404,750	$ 404,750
Contingent consideration payable to sellers	(118,500)	$ (118,700)
USAA AMCO
Acquisitions
Cash and cash equivalents			$ 17,473
Investment management fees receivable			25,353
Fund administration and distribution fees receivable			4,779
Other receivables and prepaid expenses			299
Property and equipment			1,165
Other intangible assets			808,670
Goodwill	120,600		120,643
Accounts payable and accrued expenses			(5,575)
Accrued compensation and benefits			(5,907)
Payable to members and custodians			(17,473)
Contingent consideration payable to sellers	$ (98,800)		(98,800)
Total purchase price consideration			$ 850,627