Income taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Deferred compensation	$ 27,161	$ 31,083
Deferred rent and lease incentives	9,877	10,828
Net operating losses and credits	9,593	9,304
Receivable reserves	1,294	2,257
Accrued expenses	13,121	3,516
Auction rate securities reserves	1,394	1,387
Involuntary conversion	1,704	1,749
Other	958	986
Total deferred tax assets	65,102	61,110
Valuation allowance	(7,036)	(6,153)
Deferred tax assets after valuation allowance	58,066	54,957
Deferred tax liabilities:
Goodwill	41,775	42,455
Partnership investments	32,679	37,196
Company-owned life insurance	11,527	16,854
Depreciation	1,617	2,139
Other	272	329
Total deferred tax liabilities	87,870	98,973
Total deferred tax liabilities	$ (29,804)	$ (44,016)