Segment and Geographic Information - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Increase (decrease) to operating income (loss)	$ 1,608	$ (2,256)	$ (5,740)	$ (3,691)	$ (419)	$ (1,321)	$ 267	$ 962	$ (10,079)	$ (511)
Corporate
Segment Reporting Information [Line Items]
Increase (decrease) to operating income (loss)									(7,787)	$ (12,201)
Pro Forma | Corporate
Segment Reporting Information [Line Items]
Increase (decrease) to operating income (loss)									(8,100)
Personal Information Services | Pro Forma
Segment Reporting Information [Line Items]
Increase (decrease) to operating income (loss)									$ (9,100)