Consolidation - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Cash equivalents	$ 331,918	$ 225,736
Total assets measured at fair value	462,085	324,666
Liabilities
Total liabilities measured at fair value	20,000	36,100
Level 1
Assets
Cash equivalents	331,918	225,736
Total assets measured at fair value	430,031	323,210
Liabilities
Total liabilities measured at fair value	0	0
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	2,403	1,456
Liabilities
Total liabilities measured at fair value	0	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	29,651	0
Liabilities
Total liabilities measured at fair value	20,000	36,100
Fair Value, Measurements, Recurring | Consolidated Investment Products
Assets
Cash equivalents	85,952	127,695
Total assets measured at fair value	2,324,670	2,398,412
Liabilities
Notes payable	2,030,580	2,171,946
Short sales	272	356
Total liabilities measured at fair value	2,030,852	2,172,302
Fair Value, Measurements, Recurring | Debt investments | Consolidated Investment Products
Assets
Investments	2,192,380	2,246,600
Fair Value, Measurements, Recurring | Equity investments | Consolidated Investment Products
Assets
Investments	46,338	24,117
Fair Value, Measurements, Recurring | Level 1 | Consolidated Investment Products
Assets
Cash equivalents	85,952	127,695
Total assets measured at fair value	131,741	150,688
Liabilities
Notes payable	0	0
Short sales	272	356
Total liabilities measured at fair value	272	356
Fair Value, Measurements, Recurring | Level 1 | Debt investments | Consolidated Investment Products
Assets
Investments	53	0
Fair Value, Measurements, Recurring | Level 1 | Equity investments | Consolidated Investment Products
Assets
Investments	45,736	22,993
Fair Value, Measurements, Recurring | Level 2 | Consolidated Investment Products
Assets
Cash equivalents	0	0
Total assets measured at fair value	2,163,703	2,240,035
Liabilities
Notes payable	2,030,580	2,171,946
Short sales	0	0
Total liabilities measured at fair value	2,030,580	2,171,946
Fair Value, Measurements, Recurring | Level 2 | Debt investments | Consolidated Investment Products
Assets
Investments	2,163,678	2,239,924
Fair Value, Measurements, Recurring | Level 2 | Equity investments | Consolidated Investment Products
Assets
Investments	25	111
Fair Value, Measurements, Recurring | Level 3 | Consolidated Investment Products
Assets
Cash equivalents	0	0
Total assets measured at fair value	29,226	7,689
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	28,649	6,676
Fair Value, Measurements, Recurring | Level 3 | Equity investments | Consolidated Investment Products
Assets
Investments	$ 577	$ 1,013