Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash equivalents	$ 197,240	$ 287,126
Total assets measured at fair value	307,226	374,279
Liabilities
Total liabilities measured at fair value	56,200	78,100
Level 1
Assets
Cash equivalents	197,240	287,126
Total assets measured at fair value	307,226	374,279
Liabilities
Total liabilities measured at fair value	0	0
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	0	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	56,200	78,100
Fair Value, Measurements, Recurring | Consolidated Investment Products
Assets
Cash equivalents	98,101	249,003
Total assets measured at fair value	2,180,814	2,439,116
Liabilities
Notes payable	1,922,243	2,083,314
Short sales	518	414
Total liabilities measured at fair value	1,922,761	2,083,728
Fair Value, Measurements, Recurring | Debt investments | Consolidated Investment Products
Assets
Investments	2,049,617	2,161,571
Fair Value, Measurements, Recurring | Equity investments | Consolidated Investment Products
Assets
Investments	33,096	28,542
Fair Value, Measurements, Recurring | Level 1 | Consolidated Investment Products
Assets
Cash equivalents	98,101	249,003
Total assets measured at fair value	130,984	274,249
Liabilities
Notes payable	0	0
Short sales	518	414
Total liabilities measured at fair value	518	414
Fair Value, Measurements, Recurring | Level 1 | Debt investments | Consolidated Investment Products
Assets
Investments	241	243
Fair Value, Measurements, Recurring | Level 1 | Equity investments | Consolidated Investment Products
Assets
Investments	32,642	25,003
Fair Value, Measurements, Recurring | Level 2 | Consolidated Investment Products
Assets
Cash equivalents	0	0
Total assets measured at fair value	2,012,768	2,121,286
Liabilities
Notes payable	1,922,243	2,083,314
Short sales	0	0
Total liabilities measured at fair value	1,922,243	2,083,314
Fair Value, Measurements, Recurring | Level 2 | Debt investments | Consolidated Investment Products
Assets
Investments	2,012,760	2,119,082
Fair Value, Measurements, Recurring | Level 2 | Equity investments | Consolidated Investment Products
Assets
Investments	8	2,204
Fair Value, Measurements, Recurring | Level 3 | Consolidated Investment Products
Assets
Cash equivalents	0	0
Total assets measured at fair value	37,062	43,581
Liabilities
Notes payable	0	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	36,616	42,246
Fair Value, Measurements, Recurring | Level 3 | Equity investments | Consolidated Investment Products
Assets
Investments	$ 446	$ 1,335