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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