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RELATED PARTY TRANSACTIONS - Narrative (Details)
shares in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2018
USD ($)
aircraft
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Sep. 29, 2017
USD ($)
intercompany_note
Match Group | Employee Matters Agreement            
Related Party Transaction [Line Items]            
Shares received from related party pursuant to employee matters agreement (in shares) | shares     3.0 11.9 1.0  
Shares received from related party as reimbursement for exercise and settlement of equity awards denominated in shares of subsidiary (in shares) | shares     2.5 11.3 0.5  
Shares received from related party as reimbursement for exercise and vesting of equity awards denominated in shares of parent (in shares) | shares     0.5 0.6 0.4  
Match Group | Services Agreement            
Related Party Transaction [Line Items]            
Payments received from related parties     $ 7,600,000 $ 9,900,000 $ 11,800,000  
Match Group | Leased Office Space            
Related Party Transaction [Line Items]            
Expenses from transactions with related parties     5,200,000 5,100,000 $ 4,300,000  
Match Group | Tax Sharing Agreement            
Related Party Transaction [Line Items]            
Payments received from related parties     7,000,000 10,900,000    
Amounts due to related parties   $ 7,300,000 0 7,300,000    
Match Group | Net Operating Loss Sold            
Related Party Transaction [Line Items]            
Expenses from transactions with related parties     900,000      
ANGI Homeservices            
Related Party Transaction [Line Items]            
Current accounts receivable due from related party   $ 2,000,000 $ 0 2,000,000    
ANGI Homeservices | Employee Matters Agreement            
Related Party Transaction [Line Items]            
Shares received from related party pursuant to employee matters agreement (in shares) | shares   0.4 0.9      
ANGI Homeservices | Services Agreement            
Related Party Transaction [Line Items]            
Payments received from related parties   $ 1,700,000 $ 5,700,000 $ 400,000    
Amounts due to related parties     100,000      
ANGI Homeservices | Tax Sharing Agreement            
Related Party Transaction [Line Items]            
Current notes receivable due from related party     12,100,000      
Payments received from related party tax expense     $ 0      
ANGI Homeservices | Intercompany Notes            
Related Party Transaction [Line Items]            
Number of related party debt instruments | intercompany_note           2
ANGI Homeservices | Payoff Intercompany Note            
Related Party Transaction [Line Items]            
Current notes receivable due from related party           $ 61,500,000
ANGI Homeservices | Working Capital Intercompany Note            
Related Party Transaction [Line Items]            
Current notes receivable due from related party           $ 15,000,000
Other Affiliates            
Related Party Transaction [Line Items]            
Ownership interest held by each of the Company and Expedia in aircraft (as a percent)     50.00%      
Number of aircraft operated | aircraft     2      
IAC's total purchase price and refurbish costs in aircraft $ 17,400,000          
Percentage of total purchase price and refurbish costs paid in related party transaction 50.00%          
Ownership interest held by each of the Company and Expedia in an entity employing aircraft flight crew (as a percent)     50.00%      
Class B Common Stock | ANGI Homeservices | Angie's List Merger Agreement            
Related Party Transaction [Line Items]            
Stock received from related party (shares) | shares     5.1