COMMITMENTS AND CONTINGENCIES (Details) (USD $)	0 Months Ended	1 Months Ended		0 Months Ended
	Nov. 25, 2013	May 31, 2011 class_action_lawsuits	Mar. 31, 2014 current_litigation_matters	Feb. 16, 2012 New Term Loan [Member] CoStar Group [Member] LoopNet [Member]	Feb. 16, 2012 Revolving Credit Facility [Member] CoStar Group [Member] LoopNet [Member]	Mar. 31, 2014 Civix [Member]	Nov. 05, 2013 Civix [Member]	Mar. 31, 2014 LoopNet Stockholders [Member]
Business Acquisition [Line Items]
Debt instrument borrowing capacity				$ 175,000,000	$ 50,000,000
Term of loan (in years)				5 years	5 years
Class action lawsuits brought by alleged LoopNet stockholders (in lawsuits)		3
Loss contingency accrual						1,200,000	600,000	200,000
Loss contingency, value of damages sought	3,700,000
Loss contingency in excess of amount accrued						$ 2,500,000
Minimum number of current litigation matters			1