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(LOSS) EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Numerator: Basic |  |
Net (loss) earnings | $ (182,643) | $ 112,985
Net earnings attributable to noncontrolling interests | (28,397) | (24,290)
Net (loss) earnings attributable to IAC shareholders | (211,040) | 88,695
Numerator: Diluted |  |
Net (loss) earnings | (182,643) | 112,985
Net earnings attributable to noncontrolling interests | (28,397) | (24,290)
Impact from publicly-traded subsidiaries' dilutive securities | 0 | (6,696)
Net (loss) earnings attributable to IAC shareholders | $ (211,040) | $ 81,999
Denominator: Basic |  |
Weighted average basic shares outstanding (shares) | 84,839 | 83,905
Denominator: Diluted |  |
Weighted average basic shares outstanding (shares) | 84,839 | 83,905
Dilutive securities (shares) | 0 | 6,435
Denominator for earnings per share - weighted average shares (shares) | 84,839 | 90,340
Earnings per share attributable to IAC shareholders: Basic |  |
Earnings per share (USD per share) | $ (2.49) | $ 1.06
Earnings per share attributable to IAC shareholders: Diluted |  |
Earnings per share (USD per share) | $ (2.49) | 0.91
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Average share price (USD per share) |  | $ 207.01
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) | 19,700 |
Restricted Stock Units (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) |  | 3,400
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
Senior Notes | 2022 Exchangeable Notes |  |
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) |  | 900
Exchange price per share (USD per share) | $ 152.18 |
Senior Notes | 2026 Exchangeable Notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Exchange price per share (USD per share) | 302.77 |
Senior Notes | 2030 Exchangeable Notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Exchange price per share (USD per share) | $ 291.35 |

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