COMMITMENTS AND CONTINGENCIES (Details) (CoStar Group [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Apr. 03, 2014
Apr. 01, 2014
Term Loan [Member]    
Business Acquisition [Line Items]    
Debt instrument borrowing capacity   $ 400.0
Term of loan (in years) 5 years  
Revolving Credit Facility [Member]    
Business Acquisition [Line Items]    
Debt instrument borrowing capacity   $ 225.0
Term of loan (in years) 5 years