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LONG-TERM DEBT LONG-TERM DEBT (Details) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
Feb. 16, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
New Term Loan [Member]
Sep. 30, 2012
New Term Loan [Member]
Sep. 30, 2013
New Term Loan [Member]
Sep. 30, 2012
New Term Loan [Member]
Feb. 16, 2012
CoStar Group [Member]
LoopNet [Member]
Committed Term Loan [Member]
Feb. 16, 2012
CoStar Group [Member]
LoopNet [Member]
New Revolving Credit Facility [Member]
Feb. 16, 2012
CoStar Group [Member]
LoopNet [Member]
New Term Loan [Member]
Apr. 30, 2012
CoStar Group [Member]
LoopNet [Member]
New Term Loan [Member]
Feb. 16, 2012
Minimum [Member]
Feb. 16, 2012
Maximum [Member]
Feb. 16, 2012
Maximum [Member]
CoStar Group [Member]
Swingline Loan [Member]
Feb. 16, 2012
Maximum [Member]
CoStar Group [Member]
Letter of Credit [Member]
Feb. 16, 2012
LIBOR [Member]
Feb. 16, 2012
Federal Funds Rate [Member]
Business Acquisition [Line Items]                                          
Debt instrument borrowing capacity                         $ 50,000,000 $ 175,000,000              
Term of loan (in years)                         5 years 5 years              
Line of credit facility, amount outstanding   0   0     0               175,000,000            
Revolving credit sub-facility for swing-line loans and issuances of letters of credit                                   5,000,000 10,000,000    
Annual amortization, first year after closing (in percent)                       5.00%                  
Annual amortization, second year after closing (in percent)                       10.00%                  
Annual amortization, third year after closing (in percent)                       15.00%                  
Annual amortization, fourth year after closing (in percent)                       20.00%                  
Annual amortization, fifth year after closing (in percent)                       50.00%                  
Basis spread on federal funds rate (in percent)                                       2.00% 0.50%
LIBOR Maturity Period (in months) 1 month                                        
Debt Instrument, Basis Spread on Variable Rate, One Month Interest Period (in percent)                                       1.00%  
Debt Instrument, Basis Spread on Variable Rate, Per Annum (in percent)                                       1.00%  
Default interest rate per annum on overdue amounts (in percent) 2.00%                                        
Maximum debt service coverage ratio for two quarters after closing (in percent) 150.00%                                        
Maximum total leverage ratio for fifth through eighth quarters after closing date (in percent) 275.00%                                        
Maximum total leverage ratio after eight fiscal quarters (in percent) 250.00%                                        
Excess Cash Flow Payment Maturity Period Within Issuance of Financial Statements 10 days                                        
First Excess Cash Flow Repayment, Percentage (in percent) 50.00%                                        
First Excess Cash Flow Repayment Requirement (in percent)                               300.00%          
Second Excess Cash Flow Repayment, Percentage (in percent) 25.00%                                        
Second Excess Cash Flow Repayment Requirement (in percent)                               250.00% 300.00%        
Third Excess Cash Flow Repayment, Percentage (in percent) 0.00%                                        
Third Excess Cash Flow Repayment Requirement (in percent                                 250.00%        
Unamortized Debt Issuance Expense             11,500,000                            
Debt issuance underwriting fees           9,200,000                              
Legal fees associated with the debt issuance           2,300,000                              
Interest expense, debt               1,736,000 1,822,000 5,249,000 3,000,000                    
Amortization of debt issuance costs   760,000 763,000 2,273,000 1,235,000                                
Interest paid   $ 1,307,000 $ 1,059,000 $ 3,339,000 $ 1,787,000