Revenue from Contracts with Customers - Additional Information (Detail) - Agreement	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Percentage of billing expense revenues			2.00%
Sales Revenue Net [Member] \| Fidelity, CGI and Populus [Member]
Disaggregation of Revenue [Line Items]
Number of customers	1	3	1	3
Sales Revenue Net [Member] \| Revenue from Rights Concentration Risk [Member] \| Minimum [Member]
Disaggregation of Revenue [Line Items]
Percentage of total accounts receivable	10.00%	10.00%	10.00%	10.00%
Sales Revenue Net [Member] \| Revenue from Rights Concentration Risk [Member] \| CGI [Member]
Disaggregation of Revenue [Line Items]
Percentage of total accounts receivable		10.40%		11.10%
Sales Revenue Net [Member] \| Revenue from Rights Concentration Risk [Member] \| Allegis [Member]
Disaggregation of Revenue [Line Items]
Percentage of total accounts receivable		12.70%		12.30%
Sales Revenue Net [Member] \| Revenue from Rights Concentration Risk [Member] \| Fidelity [Member]
Disaggregation of Revenue [Line Items]
Percentage of total accounts receivable	28.50%	18.10%	26.60%	15.40%
Top Ten Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue percentage of total revenue	62.00%	59.00%	60.00%	58.00%
Data and Analytics Services [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue from services			100.00%