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Compensation and Benefits - Components of expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salaries	$ 521,062	$ 469,869	$ 458,609
Restricted share-based award compensation expense	31,273	32,167	40,004
Long-term incentive compensation expense	73,063	59,526	51,773
Total compensation and benefits	$ 594,125	529,395	510,382
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Requisite Service Period, Retirement Acceleration	18 months
Variable Interest Entity, Primary Beneficiary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gain (Loss) on Investments	$ 51,961	62,702	(6,990)
Nonoperating Income (Expense) | Long-Term Cash Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gain (Loss) on Investments	14,537	16,543	(13,198)
Nonoperating Income (Expense) | Variable Interest Entity, Primary Beneficiary | Long-Term Cash Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gain (Loss) on Investments	2,264	1,370	(348)
Deferred Bonus
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 41,790	$ 27,359	$ 11,769
Deferred Bonus | Long-Term Cash Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	5 years

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