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REVENUE FROM CONTRACTS WITH CUSTOMERS , DISAGGREGATED REVENUE (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues                                                                           $ 397,159 $ 343,760 $ 789,006 $ 672,185
Information And Analytics [Member] | CoStar Suite [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           165,053 152,825 330,009 300,526
Information And Analytics [Member] | Information services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           30,536 20,777 62,918 39,627
Online Marketplaces [Member] | Multifamily Online Marketplace [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           145,541 120,488 283,001 234,756
Online Marketplaces [Member] | Commercial property and land [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           56,029 49,670 113,078 97,276
North America [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           384,362 334,562 761,809 653,799
North America [Member] | Information And Analytics [Member] | CoStar Suite [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           157,793 145,910 315,128 286,883
North America [Member] | Information And Analytics [Member] | Information services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           25,022 18,659 50,712 35,250
North America [Member] | Online Marketplaces [Member] | Multifamily Online Marketplace [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           145,541 120,488 283,001 234,756
North America [Member] | Online Marketplaces [Member] | Commercial property and land [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           56,006 49,505 112,968 96,910
International [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           12,797 9,198 27,197 18,386
International [Member] | Information And Analytics [Member] | CoStar Suite [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           7,260 6,915 14,881 13,643
International [Member] | Information And Analytics [Member] | Information services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           5,514 2,118 12,206 4,377
International [Member] | Online Marketplaces [Member] | Multifamily Online Marketplace [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           0 0 0 0
International [Member] | Online Marketplaces [Member] | Commercial property and land [Member]        
Disaggregation of Revenue [Line Items]        
Revenues                                                                           $ 23 $ 165 $ 110 $ 366