Revenue - Schedule of Disaggregation of Revenue By Service Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 838,692	$ 731,593	$ 639,111
Private Client Services
Disaggregation of Revenue [Line Items]
Total revenue	431,807	364,659	321,014
Business Tax Services
Disaggregation of Revenue [Line Items]
Total revenue	291,804	261,048	226,343
Alternative Investment Funds
Disaggregation of Revenue [Line Items]
Total revenue	72,914	68,922	58,888
Valuation Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 42,167	$ 36,964	$ 32,866