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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Redeemable Noncontrolling Interests | Total IAC Shareholders' Equity | Common Stock Common Stock $.001 Par Value | Common Stock Class B Convertible Common Stock $.001 Par Value | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock | Noncontrolling Interests | Match Group and ANGI Homeservices | Match Group and ANGI Homeservices Total IAC Shareholders' Equity | Match Group and ANGI Homeservices Additional Paid-in Capital | Match Group and ANGI Homeservices Accumulated Other Comprehensive Loss | Match Group and ANGI Homeservices Noncontrolling Interests | Match Group | Match Group Total IAC Shareholders' Equity | Match Group Additional Paid-in Capital
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Balance at beginning of period at Dec. 31, 2017 |  | $ 42,867 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings |  | 34,481 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes |  | (710) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 1,084 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value |  | (372) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests created in acquisitions | $ 14,246 | 2,261 |  |  |  |  |  |  |  | $ 14,246 |  |  |  |  |  |  |  |
Other |  | (6,519) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2018 |  | 69,530 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 2,946,823 |  | $ 2,430,028 | $ 261 | $ 16 | $ 12,165,002 | $ 595,038 | $ (103,568) | $ (10,226,721) | 516,795 |  |  |  |  |  |  |  |
Balance at beginning of period (shares) at Dec. 31, 2017 |  |  |  | 260,624,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings | 505,789 |  | 435,209 |  |  |  | 435,209 |  |  | 70,580 |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes | (11,538) |  | (9,616) |  |  |  |  | (9,616) |  | (1,922) |  |  |  |  |  |  |  |
Stock-based compensation expense | 170,922 |  | 52,763 |  |  | 52,763 |  |  |  | 118,159 |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes | 34,903 |  | 34,903 | $ 1 |  | 34,902 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares) |  |  |  | 1,416,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | (82,891) |  | (82,891) |  |  |  |  |  | (82,891) |  |  |  |  |  |  | $ (86,239) | $ (86,239) | $ (86,239)
Purchase of redeemable noncontrolling interests | (1,236) | (3,562) |  |  |  |  |  |  |  | (1,236) |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value | 372 |  | 372 |  |  | 372 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ (205,416) | $ (213,111) | $ (213,440) | $ 329 | $ 7,695 |  |  |
Noncontrolling interests created in acquisitions | 14,246 | 2,261 |  |  |  |  |  |  |  | 14,246 |  |  |  |  |  |  |  |
Other | 2,652 |  | 2,269 |  |  | 2,269 |  |  |  | 383 |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 3,328,592 |  | 2,600,482 | $ 262 | $ 16 | 11,955,629 | 1,067,042 | (112,855) | (10,309,612) | 728,110 |  |  |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2018 |  |  |  | 262,040,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2018 |  | 75,719 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings |  | (275) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes |  | (424) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 284 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of redeemable noncontrolling interests |  | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value |  | (2,221) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | (50) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2018 |  | 69,530 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2018 | 3,236,948 |  | 2,576,079 | $ 262 | $ 16 | 12,008,684 | 921,268 | (112,717) | (10,241,434) | 660,869 |  |  |  |  |  |  |  |
Balance at beginning of period (shares) at Jun. 30, 2018 |  |  |  | 261,757,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings | 171,852 |  | 145,774 |  |  |  | 145,774 |  |  | 26,078 |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes | (654) |  | (529) |  |  |  |  | (529) |  | (125) |  |  |  |  |  |  |  |
Stock-based compensation expense | 55,079 |  | 16,748 |  |  | 16,748 |  |  |  | 38,331 |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes | 9,012 |  | 9,012 |  |  | 9,012 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares) |  |  |  | 283,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock | (68,178) |  | (68,178) |  |  |  |  |  | (68,178) |  |  |  |  |  |  | $ (6,433) | $ (6,433) | $ (6,433)
Purchase of redeemable noncontrolling interests | (418) | (3,562) |  |  |  |  |  |  |  | (418) |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value | 2,221 |  | 2,221 |  |  | 2,221 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (70,838) | (74,089) | (74,480) | 391 | 3,251 |  |  |
Other | 1 |  | (123) |  |  | (123) |  |  |  | 124 |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 3,328,592 |  | 2,600,482 | $ 262 | $ 16 | 11,955,629 | 1,067,042 | (112,855) | (10,309,612) | 728,110 |  |  |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2018 |  |  |  | 262,040,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 65,687 | 65,687 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings |  | 4,625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes |  | (514) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 113 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of redeemable noncontrolling interests |  | (6,192) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value |  | 8,607 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests created in acquisitions |  | 5,009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | (33) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 77,302 | 77,302 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 3,551,801 |  | 2,843,125 | $ 262 | $ 16 | 12,022,387 | 1,258,794 | (128,722) | (10,309,612) | 708,676 |  |  |  |  |  |  |  |
Balance at beginning of period (shares) at Dec. 31, 2018 |  |  |  | 262,303,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings | 414,923 |  | 330,706 |  |  |  | 330,706 |  |  | 84,217 |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes | (20,138) |  | (16,303) |  |  |  |  | (16,303) |  | (3,835) |  |  |  |  |  |  |  |
Stock-based compensation expense | 179,639 |  | 63,387 |  |  | 63,387 |  |  |  | 116,252 |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes | (78,058) |  | (78,058) | $ 1 |  | (78,059) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares) |  |  |  | 807,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  | (220,636) | (220,636) | (220,636) |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value | (8,607) |  | (8,607) |  |  | (8,607) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (197,236) | (200,240) | (200,661) | 421 | 3,004 |  |  |
Noncontrolling interests created in acquisitions |  | 5,009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of exchangeable note hedges | (303,428) |  | (303,428) |  |  | (303,428) |  |  |  |  |  |  |  |  |  |  |  |
Equity component of exchangeable senior notes, net of deferred financing costs and deferred tax liabilities | 320,998 |  | 320,998 |  |  | 320,998 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of warrants | 166,520 |  | 166,520 |  |  | 166,520 |  |  |  |  |  |  |  |  |  |  |  |
Other | (17) |  | (190) |  |  | (190) |  |  |  | 173 |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 3,805,761 |  | 2,897,274 | $ 263 | $ 16 | 11,761,711 | 1,589,500 | (144,604) | (10,309,612) | 908,487 |  |  |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2019 |  |  |  | 263,110,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2019 |  | 80,502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings |  | (1,270) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes |  | (365) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of redeemable noncontrolling interests |  | (71) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value |  | (1,531) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 77,302 | $ 77,302 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2019 | 3,843,597 |  | 2,983,461 | $ 263 | $ 16 | 11,957,543 | 1,460,956 | (125,705) | (10,309,612) | 860,136 |  |  |  |  |  |  |  |
Balance at beginning of period (shares) at Jun. 30, 2019 |  |  |  | 262,789,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings | 161,042 |  | 128,544 |  |  |  | 128,544 |  |  | 32,498 |  |  |  |  |  |  |  |
Other comprehensive loss, net of income taxes | (22,688) |  | (18,389) |  |  |  |  | (18,389) |  | (4,299) |  |  |  |  |  |  |  |
Stock-based compensation expense | 49,853 |  | 20,332 |  |  | 20,332 |  |  |  | 29,521 |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes | (55,036) |  | (55,036) |  |  | (55,036) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares) |  |  |  | 321,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  | (139,779) | (139,779) | (139,779) |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value | 1,531 |  | 1,531 |  |  | 1,531 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ (32,628) | $ (23,259) | $ (22,749) | $ (510) | $ (9,369) |  |  |
Equity component of exchangeable senior notes, net of deferred financing costs and deferred tax liabilities | (130) |  | (130) |  |  | (130) |  |  |  |  |  |  |  |  |  |  |  |
Other | (1) |  | (1) |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | $ 3,805,761 |  | $ 2,897,274 | $ 263 | $ 16 | $ 11,761,711 | $ 1,589,500 | $ (144,604) | $ (10,309,612) | $ 908,487 |  |  |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2019 |  |  |  | 263,110,000 | 16,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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