Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Useful Life of Other Purchased Intangible Assets (Details)

v3.10.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Useful Life of Other Purchased Intangible Assets (Details)
 12 Months Ended
Dec. 31, 2018
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