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Segment information - Additional Information (Detail) - Segment	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue [Member] | Outside of United States [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Revenue	10.00%	10.00%	10.00%	10.00%
Prior to Spin-off of Red Violet [Member]
Segment Reporting Information [Line Items]
Number of reportable segments			2
After Spin-off of Red Violet [Member]
Segment Reporting Information [Line Items]
Number of reportable segments			1

X

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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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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