SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Useful Life of Other Purchased Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2016
Purchased data files | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	2 years
Purchased data files | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	15 years
Acquired software and technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	1 year
Acquired software and technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years
Non-compete agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	1 year
Non-compete agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years
Proprietary database | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	6 years
Proprietary database | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	2 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	25 years
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	1 year
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	15 years