Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash equivalents	$ 127,862	$ 187,255
Total assets measured at fair value	170,488	256,969
Level 1
Assets
Cash equivalents	127,862	187,255
Total assets measured at fair value	170,482	256,953
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	6	16
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Consolidated Investment Products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	221,505	97,130
Derivatives	2,211
Total assets measured at fair value	2,413,473	2,127,240
Liabilities
Notes payable	2,134,108	1,834,535
Derivatives	1,776
Short sales	313	430
Total liabilities measured at fair value	2,136,197	1,834,965
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments	2,168,233	2,013,034
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Equity investments
Assets
Investments	21,524	17,076
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	221,505	97,130
Derivatives	803
Total assets measured at fair value	256,979	113,220
Liabilities
Notes payable	0	0
Derivatives	333
Short sales	313	430
Total liabilities measured at fair value	646	430
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1 \| Debt investments
Assets
Investments	16,368	218
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1 \| Equity investments
Assets
Investments	18,303	15,872
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Derivatives	1,408
Total assets measured at fair value	2,155,204	1,973,598
Liabilities
Notes payable	2,134,108	1,834,535
Derivatives	1,443
Short sales	0	0
Total liabilities measured at fair value	2,135,551	1,834,535
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments	2,151,158	1,973,427
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2 \| Equity investments
Assets
Investments	2,638	171
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3
Assets
Cash equivalents	0	0
Derivatives	0
Total assets measured at fair value	1,290	40,422
Liabilities
Notes payable	0	0
Derivatives	0
Short sales	0	0
Total liabilities measured at fair value	0	0
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3 \| Debt investments
Assets
Investments	707	39,389
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity investments
Assets
Investments	$ 583	$ 1,033

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 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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