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Revenue from Contracts with Customers - Additional Information (Detail) - Agreement	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Percentage of billing expense revenues	2.00%
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%
Sales Revenue Net [Member] | Revenue from Rights Concentration Risk [Member] | CGI [Member]
Disaggregation of Revenue [Line Items]
Percentage of total accounts receivable	22.50%	22.20%	15.00%
Number of customers	1	1	1
Sales Revenue Net [Member] | Customer Concentration Risk [Member] | Our largest industry vertical financial services [Member]
Disaggregation of Revenue [Line Items]
Revenue percentage of total revenue	50.00%	50.00%	45.00%
Accounts Receivable [Member] | Accounts Receivable Concentration Risk [Member] | CGI [Member]
Disaggregation of Revenue [Line Items]
Percentage of total accounts receivable	27.00%	30.90%
Top Ten Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue percentage of total revenue	53.00%	53.00%	48.00%
Data and Analytics Services [Member]
Disaggregation of Revenue [Line Items]
Percent of revenue from services	100.00%

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