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(LOSS) EARNINGS PER SHARE - Summary (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Nov. 05, 2020
Numerator: Basic        
Net (loss) earnings from continuing operations $ (573,168) $ 294,867 $ (1,076,409)  
Net (earnings) loss attributable to noncontrolling interests of continuing operations (349) 1,689 2,687  
Net earnings attributed to unvested participating security 0 (10,277) 0  
Net (loss) earnings from continuing operations attributable to IAC common stock and Class B common stock shareholders (573,517) 286,279 (1,073,722)  
Earnings (loss) from discontinued operations, net of tax 39,838 (36,550) (116,046)  
Net (earnings) loss attributable to noncontrolling interests of discontinued operations (6,218) 5,936 19,598  
Net earnings attributed to unvested participating security 0 1,061 0  
Net earnings (loss) from discontinued operations attributable to IAC common stock and Class B common stock shareholders 33,620 (29,553) (96,448)  
Net (loss) earnings attributable to IAC common stock and Class B common stock shareholders $ (539,897) $ 256,726 $ (1,170,170)  
Denominator: Basic        
Weighted average basic IAC Common Stock and Class B common stock shares outstanding (in shares) 83,130,000 83,569,000 86,350,000  
(Loss) Earnings per share: Basic        
(Loss) earnings per share from continuing operations attributable to IAC common stock and Class B common stock shareholders (USD per share) $ (6.89) $ 3.42 $ (12.43)  
Earnings (loss) per share from discontinued operations, net of tax, attributable to IAC common stock and Class B common stock shareholders (USD per share) 0.40 (0.35) (1.12)  
(Loss) earnings per share attributable to IAC common stock and Class B common stock shareholders (USD per share) $ (6.49) $ 3.07 $ (13.55)  
Numerator: Diluted        
Net (loss) earnings from continuing operations $ (573,168) $ 294,867 $ (1,076,409)  
Net (earnings) loss attributable to noncontrolling interests of continuing operations (349) 1,689 2,687  
Net earnings attributed to unvested participating security 0 (9,944) 0  
Net (loss) earnings from continuing operations attributable to IAC common stock and Class B common stock shareholders (573,517) 286,612 (1,073,722)  
Earnings (loss) from discontinued operations, net of tax 39,838 (36,550) (116,046)  
Net (earnings) loss attributable to noncontrolling interests of discontinued operations (6,218) 5,936 19,598  
Net earnings attributed to unvested participating security 0 1,026 0  
Net earnings (loss) from discontinued operations attributable to IAC common stock and Class B common stock shareholders 33,620 (29,588) (96,448)  
Net (loss) earnings attributable to IAC common stock and Class B common stock shareholders $ (539,897) $ 257,024 $ (1,170,170)  
Denominator: Diluted        
Weighted average basic IAC Common Stock and Class B common stock shares outstanding (in shares) 83,130,000 83,569,000 86,350,000  
Dilutive securities (in shares) 0 2,895,000 0  
Denominator for earnings per share - weighted average shares (in shares) 83,130,000 86,464,000 86,350,000  
(Loss) earnings per share: Diluted        
(Loss) earnings per share from continuing operations attributable to IAC Common Stock and Class B common stock shareholders (USD per share) $ (6.89) $ 3.31 $ (12.43)  
Earnings (loss) per share from discontinued operations, net of tax, attributable to IAC common stock and Class B common stock shareholders (USD per share) 0.40 (0.34) (1.12)  
(Loss) earnings per share attributable to IAC common stock and Class B common stock shareholders (USD per share) $ (6.49) $ 2.97 $ (13.55)  
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) 8,500,000 3,600,000 7,900,000  
Chief Executive Officer | Restricted Stock Awards | RSA Agreement        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares authorized for issuance (in shares)       3,000,000.0