Revenue - Schedule of Disaggregation of Revenue By Service Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 240,746	$ 208,067
Private Client Services
Disaggregation of Revenue [Line Items]
Total revenue	123,177	104,191
Business Tax Services
Disaggregation of Revenue [Line Items]
Total revenue	80,635	71,703
Alternative Investment Funds
Disaggregation of Revenue [Line Items]
Total revenue	25,193	22,166
Valuation Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 11,741	$ 10,007