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SEGMENT REPORTING, REVENUES BY SERVICES (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2016

Sep. 30, 2015

Sep. 30, 2016

Sep. 30, 2015

Revenue from External Customer [Line Items]

Revenues

$ 212,711

$ 189,078

$ 619,319

$ 518,755

CoStar Suite [Member]

Revenue from External Customer [Line Items]

Revenues

^[1]

103,261

91,350

301,969

266,931

Information services [Member]

Revenue from External Customer [Line Items]

Revenues

^[2]

19,486

19,126

58,336

56,415

Multifamily [Member]

Revenue from External Customer [Line Items]

Revenues

^[3]

57,654

49,312

164,752

110,187

Commercial property and land [Member]

Revenue from External Customer [Line Items]

Revenues

^[4]

$ 32,310

$ 29,290

$ 94,262

$ 85,222

[1]	CoStar Suite is comprised of CoStar Property Professional, CoStar COMPS Professional, CoStar Tenant; CoStar Market Analytics; and CoStar Portfolio Strategy.
[2]	Information services is comprised of LoopNet Premium Searcher; CoStar Real Estate Manager; CoStar Risk Analytics COMPASS; CoStar Investment Analysis Portfolio Maximizer; CoStar Investment Analysis Request; CoStar Brokerage Applications; PROPEX; Grecam; Belbex and Thomas Daily.
[3]	Multifamily is comprised of Apartments.com, ApartmentFinder.com and ApartmentHomeLiving.com.
[4]	Commercial property and land is comprised of LoopNet Premium Lister; LoopLink; CoStar Advertising; BizBuySell and BizQuest; LandsofAmerica and LandAndFarm; and CoStar Private Sale Network.

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- Definition

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+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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