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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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