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ORGANIZATION - Narrative (Details)
professional in Thousands, project in Millions
12 Months Ended
Dec. 31, 2020
project
professional
category
segment
Dec. 31, 2019
Dec. 31, 2018
Noncontrolling Interest [Line Items]      
Number of service categories 500    
Number of service professionals (more than) | professional 240    
Number of projects (more than) | project 32    
Number of operating segments | segment 2    
United States | Geographic Concentration Risk      
Noncontrolling Interest [Line Items]      
Revenue concentration risk percentage (greater than) 95.00%    
United States | Revenue Benchmark | Geographic Concentration Risk      
Noncontrolling Interest [Line Items]      
Revenue concentration risk percentage (greater than) 10.00% 10.00% 10.00%
Angie's List      
Noncontrolling Interest [Line Items]      
Number of service categories 700    
ANGI Homeservices | Class B Common Stock | IAC      
Noncontrolling Interest [Line Items]      
Ownership interest (as a percent) 84.30%    
Voting interest (as a percent) 98.20%