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Revenue from Contracts with Customers - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | 11.30% | 12.80% | 12.60%
Sales Revenue Net [Member] | Revenue from Rights Concentration Risk [Member] | Accenture PLC [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total accounts receivable |  |  | 10.70%
Accounts Receivable [Member] | Revenue from Rights Concentration Risk [Member] | CGI [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total accounts receivable | 10.30% | 17.90% |
Top Ten Customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue percentage of total revenue | 45.00% | 47.00% | 47.00%
Data and Analytics Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of revenue from customers |  | 100.00% |

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