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THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
consumer_review
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
operating_segment
consumer_review
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Entity Operations Information [Abstract]              
Number of consumer reviews | consumer_review 15,000,000   15,000,000        
Period of consumer reviews collected     20 years        
Number of operating segments | operating_segment     2        
Deferred income taxes $ 3,615   $ 3,615       $ 5,626
Retained earnings (accumulated deficit) (55,484)   (55,484)       $ (121,764)
Operating loss 33,515 $ (112,505) 46,021 $ (113,953)      
Accounting Standards Update 2014-09              
Entity Operations Information [Abstract]              
Current asset for capitalized sales commissions           $ 29,700  
Noncurrent asset for capitalized sales commissions           4,200  
Deferred income taxes           8,300  
Retained earnings (accumulated deficit)           $ 25,600  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09              
Entity Operations Information [Abstract]              
Operating loss $ (249)   $ 7,962        
Forecast | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09              
Entity Operations Information [Abstract]              
Operating loss         $ 8,000    
ANGI Homeservices | Class B Common Stock | IAC              
Entity Operations Information [Abstract]              
Ownership interest (as a percent) 86.30%   86.30%        
Voting interest (as a percent) 98.40%   98.40%