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Revenue from Contracts with Customers - Additional Information (Detail) - Agreement | 12 Months Ended
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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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