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EARNINGS PER SHARE - Summary (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 21, 2019
Oct. 02, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator: Basic            
Net earnings     $ 146,791 $ 280,854 $ 259,776 $ 368,693
Net earnings attributable to noncontrolling interests     (33,324) (62,501) (57,614) (79,258)
Net earnings attributable to IAC shareholders     113,467 218,353 202,162 289,435
Numerator: Diluted            
Net earnings     146,791 280,854 259,776 368,693
Net earnings attributable to noncontrolling interests     (33,324) (62,501) (57,614) (79,258)
Impact from public subsidiaries' dilutive securities     (6,136) (6,994) (12,832) (12,569)
Net earnings attributable to IAC shareholders     $ 107,331 $ 211,359 $ 189,330 $ 276,866
Denominator: Basic            
Weighted average basic shares outstanding (shares)     84,139,000 83,604,000 84,023,000 83,296,000
Denominator: Diluted            
Weighted average basic shares outstanding (shares)     84,139,000 83,604,000 84,023,000 83,296,000
Dilutive securities (shares)     5,965,000 7,330,000 6,205,000 7,438,000
Denominator for earnings per share - weighted average shares (shares)     90,104,000 90,934,000 90,228,000 90,734,000
Earnings per share attributable to IAC shareholders: Basic            
Basic earnings per share (USD per share)     $ 1.35 $ 2.61 $ 2.41 $ 3.47
Earnings per share attributable to IAC shareholders: Diluted            
Diluted earnings per share (USD per share)     1.19 2.32 2.10 3.05
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Average share price (USD per share)     $ 223.29 $ 153.21 $ 215.28 $ 150.39
Stock options, warrants, and subsidiary denominated equity exchange of Exchangeable Notes and vesting of RSUs            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)     11,200,000 3,400,000   6,900,000
Market-based awards and PSUs            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)     300,000 200,000   200,000
Senior Notes | 0.875% Exchangeable Notes due 2022            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)     1,100,000 100,000 1,000,000.0  
Exchange price per share (USD per share)   $ 152.18        
Stated interest rate (as a percent)   0.875%        
Senior Notes | 0.875% Exchangeable Notes due 2026            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)         0  
Exchange price per share (USD per share) $ 302.77          
Stated interest rate (as a percent) 0.875%          
Senior Notes | 2.00% Exchangeable Notes due 2030            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)     0   0  
Exchange price per share (USD per share) $ 291.35          
Stated interest rate (as a percent) 2.00%