Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash equivalents	$ 178,556	$ 207,101
Total assets measured at fair value	230,637	257,703
Level 1
Assets
Cash equivalents	178,556	207,101
Total assets measured at fair value	230,634	257,700
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	3	3
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring \| Consolidated Investment Products
Assets
Cash equivalents	168,514	82,295
Derivatives		2,085
Total assets measured at fair value	2,468,121	2,416,944
Liabilities
Notes payable	2,197,695	2,190,445
Derivatives		1,471
Short sales	656	520
Total liabilities measured at fair value	2,198,351	2,192,436
Fair Value, Measurements, Recurring \| Debt investments \| Consolidated Investment Products
Assets
Investments	2,268,623	2,289,426
Fair Value, Measurements, Recurring \| Equity investments \| Consolidated Investment Products
Assets
Investments	30,984	43,138
Fair Value, Measurements, Recurring \| Level 1 \| Consolidated Investment Products
Assets
Cash equivalents	168,514	82,295
Derivatives		858
Total assets measured at fair value	197,594	138,480
Liabilities
Notes payable	0	0
Derivatives		714
Short sales	656	520
Total liabilities measured at fair value	656	1,234
Fair Value, Measurements, Recurring \| Level 1 \| Debt investments \| Consolidated Investment Products
Assets
Investments	176	16,859
Fair Value, Measurements, Recurring \| Level 1 \| Equity investments \| Consolidated Investment Products
Assets
Investments	28,904	38,468
Fair Value, Measurements, Recurring \| Level 2 \| Consolidated Investment Products
Assets
Cash equivalents	0	0
Derivatives		1,227
Total assets measured at fair value	2,242,961	2,224,282
Liabilities
Notes payable	2,197,695	2,190,445
Derivatives		757
Short sales	0	0
Total liabilities measured at fair value	2,197,695	2,191,202
Fair Value, Measurements, Recurring \| Level 2 \| Debt investments \| Consolidated Investment Products
Assets
Investments	2,241,663	2,219,199
Fair Value, Measurements, Recurring \| Level 2 \| Equity investments \| Consolidated Investment Products
Assets
Investments	1,298	3,856
Fair Value, Measurements, Recurring \| Level 3 \| Consolidated Investment Products
Assets
Cash equivalents	0	0
Derivatives		0
Total assets measured at fair value	27,566	54,182
Liabilities
Notes payable	0	0
Derivatives		0
Short sales	0	0
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring \| Level 3 \| Debt investments \| Consolidated Investment Products
Assets
Investments	26,784	53,368
Fair Value, Measurements, Recurring \| Level 3 \| Equity investments \| Consolidated Investment Products
Assets
Investments	$ 782	$ 814

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of obligations incurred from short sales.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of notes payable.

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