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Variable Interest Entities and Consolidated Investment Products - Assets, Liabilities and Equity of the Fund (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Mar. 31, 2020
Assets of consolidated investment products
Investments	$ 36,235		$ 3,656
Less: Amounts reclassified to investment securities	1,771		849
Assets	1,284,944		1,151,962
Liabilities of consolidated investment products
Accounts payable, accrued expenses, and other	29,585		24,727
Liabilities	954,954		867,167
Redeemable noncontrolling interests	124,915		93,753
Total liabilities and equity	1,284,944		1,151,962
Variable Interest Entity, Not Primary Beneficiary
Assets of consolidated investment products
Cash and cash equivalents		$ 34,823
Accounts receivable and other		1,769
Investments		72,868
Less: Amounts reclassified to investment securities		11,200
Assets		98,260
Liabilities of consolidated investment products
Accounts payable, accrued expenses, and other		76,960
Investment liabilities, at fair value		566
Liabilities		77,526
Redeemable noncontrolling interests		20,734
Total liabilities and equity		$ 98,260
Consolidated Entity, Excluding VIE
Assets of consolidated investment products
Cash and cash equivalents	215,752		154,987	$ 170,749
Investments	$ 36,235		$ 3,656