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

X

- Definition

Customer percentage of revenue.

+ References

No definition available.

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X

- Definition

Maximum percentage of billable expenses on revenue from customer.

+ References

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X

- Definition

Number of customers accounted for revenues.

+ References

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X

- Definition

Revenue percentage to aggregate revenue.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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