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GOODWILL (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Apr. 30, 2012 LoopNet [Member] | Sep. 30, 2013 United States [Member] | Dec. 31, 2012 United States [Member] | Sep. 30, 2013 International [Member] | Dec. 31, 2012 International [Member]
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill resulting from acquisition |  |  | $ 625,174 |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | 718,078 | 91,784 |  | 692,639 | 67,465 | 25,439 | 24,319
Acquisitions |  | 625,174 |  |  | 625,174 |  | 0
Effect of foreign currency translation | (39) | 1,120 |  | 0 | 0 | (39) | 1,120
Goodwill, ending balance | $ 718,039 | $ 718,078 |  | $ 692,639 | $ 692,639 | $ 25,400 | $ 25,439

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