Acquisitions - Summary of Components of Purchase Consideration Transferred and Preliminary Allocation of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			12 Months Ended
	Mar. 10, 2023	May 03, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allocations
Goodwill			$ 776,547	$ 705,894	$ 657,131
Gerald Eve
Purchase Price
Cash	$ 101,152		101,200
Contingent consideration	11,863		11,900
Total	113,015		113,000
Allocations
Cash	18,616
Goodwill	75,638		$ 75,600
Other intangible assets, net	23,472
Receivables, net	30,995
Fixed Assets, net	6,279
Other assets	1,829
Right-of-use assets	19,472
Right-of-use liabilities	(20,925)
Accrued compensation	(22,075)
Accounts payable, accrued expenses and other liabilities	(20,286)
Net assets acquired	$ 113,015
2022 Business Acquisitions
Purchase Price
Contingent consideration		$ 7,322		7,300
Cash and stock issued at closing		65,533		65,500
Total		72,855		72,900
Allocations
Cash		1,286
Goodwill		50,756		$ 50,800
Other intangible assets, net		19,633
Receivables, net		3,625
Other assets		290
Right-of-use assets		4,305
Right-of-use liabilities		(4,305)
Accrued compensation		(2,175)
Accounts payable, accrued expenses and other liabilities		(560)
Net assets acquired		$ 72,855