Income taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Deferred compensation	$ 35,846	$ 27,780
Deferred rent and lease incentives	7,504	8,772
Net operating losses and credits	13,822	12,124
Receivable reserves	925	1,259
Accrued expenses	1,284	4,762
Auction rate securities reserves	0	62
Involuntary conversion	1,696	1,671
Other	1,028	981
Total deferred tax assets	62,105	57,411
Valuation allowance	(11,516)	(9,581)
Deferred tax assets after valuation allowance	50,589	47,830
Deferred tax liabilities:
Goodwill	41,560	40,984
Partnership investments	28,967	27,181
Corporate-owned life insurance	16,619	14,180
Depreciation	3,151	1,517
Other	198	303
Total deferred tax liabilities	90,495	84,165
Total deferred tax liabilities	$ (39,906)	$ (36,335)