Investments - Schedule of Financial Information for Company's Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statements of operations:
Total revenues	$ 2,262,818	$ 2,025,401	$ 1,795,302
Total expenses	2,182,263	1,992,830	1,717,115
Consolidated net income (loss)	123,228	38,775	58,867
Statements of financial condition:
Cash and cash equivalents	711,584	655,641
Fixed assets, net	190,012	178,300
Other assets	604,932	496,655
Total assets	3,591,967	3,175,937
Total partners’ capital	1,079,239	898,156	733,208	$ 663,315
Total liabilities, redeemable partnership interest, and equity	3,591,967	3,175,937
Equity Method Investment Nonconsolidated Investee
Statements of operations:
Total revenues	134,232	111,242	125,405
Total expenses	89,127	84,216	88,050
Consolidated net income (loss)	45,105	27,026	$ 37,355
Statements of financial condition:
Cash and cash equivalents	73,519	79,440
Fixed assets, net	2,168	1,900
Other assets	59,068	51,336
Total assets	134,755	132,676
Other liabilities	71,222	81,898
Total partners’ capital	63,533	50,779
Total liabilities, redeemable partnership interest, and equity	$ 134,755	$ 132,677