Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash equivalents	$ 138,301	$ 72,993
Total assets measured at fair value	213,083	169,462
Level 1
Assets
Cash equivalents	138,301	72,993
Total assets measured at fair value	208,040	146,123
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	18,900
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	5,043	4,439
Consolidated investment products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	49,329	82,769
Total assets measured at fair value	1,840,708	1,680,521
Liabilities
Notes payable	1,608,735	1,457,435
Derivatives		2
Short sales	661	719
Total liabilities measured at fair value	1,609,396	1,458,156
Consolidated investment products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments	1,757,556	1,561,732
Consolidated investment products \| Fair Value, Measurements, Recurring \| Equity securities
Assets
Investments	33,823	36,020
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	49,329	82,769
Total assets measured at fair value	80,326	117,895
Liabilities
Notes payable	0	0
Derivatives		2
Short sales	661	719
Total liabilities measured at fair value	661	721
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1 \| Debt investments
Assets
Investments	0	0
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 1 \| Equity securities
Assets
Investments	30,997	35,126
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	1,759,378	1,527,845
Liabilities
Notes payable	1,608,735	1,457,435
Derivatives		0
Short sales	0	0
Total liabilities measured at fair value	1,608,735	1,457,435
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments	1,756,552	1,527,845
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 2 \| Equity securities
Assets
Investments	2,826	0
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	1,004	34,781
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	1,004	33,887
Consolidated investment products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity securities
Assets
Investments	$ 0	$ 894

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 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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