Transactions with Related Parties - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2021
Related Party Transaction [Line Items]
Other income, net	$ 5,391,000	$ 3,192,000	$ 1,559,000
Cost of services (excluding depreciation and amortization)	595,085,000	461,777,000	399,900,000
Other current liabilities	5,912,000	7,227,000
Prepaid expenses and other current assets	29,688,000	17,615,000
Related Party
Related Party Transaction [Line Items]
Interest income includes interest earned on loans and notes receivable from related parties	100,000	200,000	200,000
Financing receivable, before allowance for credit loss	11,648,000	11,231,000
Total loans and notes receivable from related parties, net of allowance for credit losses	913,000	2,620,000
Related Party | Member firm loans
Related Party Transaction [Line Items]
Financing receivable, before allowance for credit loss	11,035,000	10,943,000
Total loans and notes receivable from related parties, net of allowance for credit losses	$ 300,000	2,300,000
Maturity period	10 years
Related Party | Employee loans
Related Party Transaction [Line Items]
Financing receivable, before allowance for credit loss	$ 218,000	288,000
Total loans and notes receivable from related parties, net of allowance for credit losses	200,000	$ 100,000
Maturity period		2 years
Related Party | Stewardship Funds Maturing on December 31, 2029
Related Party Transaction [Line Items]
Financing receivable, before allowance for credit loss	100,000	$ 100,000		$ 2,000,000.0
Financing receivable, term				30 days
Related Party | Stewardship Funds Maturing on December 31, 2033
Related Party Transaction [Line Items]
Financing receivable, before allowance for credit loss	300,000	0	$ 2,000,000.0
Financing receivable, term			60 days
Related Party | Trademark and License Fees
Related Party Transaction [Line Items]
Other income, net	4,600,000	2,400,000	$ 2,000,000.0
Cost of services (excluding depreciation and amortization)	100,000	600,000	$ 500,000
Other current liabilities	100,000	100,000
Related Party | Andersen Global Commitments
Related Party Transaction [Line Items]
Other current liabilities	600,000	2,000,000.0
Prepaid expenses and other current assets	4,300,000	1,300,000
Related Party | State Tax Payments
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	$ 2,700,000	$ 1,600,000