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

X

- Definition

Customer percentage of revenue.

+ References

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- Definition

Maximum percentage of billable expenses on revenue from customer.

+ References

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- Definition

Revenue percentage to aggregate revenue.

+ References

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+ References

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