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Revenue from Contracts with Customers - Additional Information (Detail) - Agreement | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Percentage of billing expense revenues | 2.00% |  |
Sales Revenue Net [Member] | Revenue from Rights Concentration Risk [Member] | CGI [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total accounts receivable | 15.00% | 11.30% | 12.80%
Number of customers | 1 | 1 | 1
Accounts Receivable [Member] | Revenue from Rights Concentration Risk [Member] | CGI [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total accounts receivable | 11.70% | 10.30% |
Top Ten Customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue percentage of total revenue | 47.00% | 45.00% | 47.00%
Data and Analytics Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of revenue from services |  |  | 100.00%

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