REPORTABLE SEGMENTS AND RELATED INFORMATION - Summary of Concentration of Risk by Total Consolidated Revenues (Details) - Consolidated Revenues	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Product Concentration Risk | Motor Vehicle Driver History Record Retrieval
Concentration Risk [Line Items]
Concentration risk percentage	31.00%	33.00%	35.00%
Product Concentration Risk | Motor Vehicle Registrations
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	14.00%	13.00%
Customer Concentration Risk | Texas NICUSA, LLC
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	20.00%	21.00%
Customer Concentration Risk | LexisNexis Risk Solutions
Concentration Risk [Line Items]
Concentration risk percentage	19.00%	22.00%	23.00%