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Goodwill - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 08, 2015	Oct. 02, 2014
Goodwill [Line Items]
Goodwill	$ 166,256,000	$ 166,256,000
Impairment of goodwill	0
Interactive Data [Member]
Goodwill [Line Items]
Goodwill	$ 5,227,000	$ 5,227,000		$ 5,227,000
Effective date of business acquisition	Oct. 02, 2014	Oct. 02, 2014
Fluent Acquisition [Member]
Goodwill [Line Items]
Goodwill	$ 155,645,000	$ 155,645,000	$ 155,645,000
Effective date of business acquisition	Dec. 08, 2015	Dec. 08, 2015
Q Interactive, LLC [Member]
Goodwill [Line Items]
Goodwill	$ 5,384,000	$ 5,384,000
Effective date of business acquisition	Jun. 08, 2016	Jun. 08, 2016

X

- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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