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QUARTERLY RESULTS (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Revenue | $ 724,455 | $ 756,872 | $ 799,411 | $ 742,249 | $ 765,251 | $ 714,470 | $ 680,612 | $ 640,600 | $ 3,022,987 | $ 2,800,933 | $ 2,059,444 |
| Cost of revenue | 222,574 | 248,856 | 272,822 | 255,849 | 267,918 | 262,275 | 237,304 | 223,300 | 1,000,101 | 990,797 | 753,889 |
| Operating income | 112,952 | 122,004 | 106,696 | 84,551 | 85,294 | 78,033 | 97,476 | 62,765 | 426,203 | 323,568 | 197,762 |
| Earnings from continuing operations | 78,829 | 91,721 | 58,540 | 52,709 | 44,408 | 46,185 | 48,101 | 31,153 | 281,799 | 169,847 | 175,569 |
| Earnings (loss) from discontinued operations, net of tax | 24 | 3,914 | (1,068) | (944) | (2,470) | (5,624) | (4,641) | 3,684 | 1,926 | (9,051) | (3,992) |
| Net earnings | 78,853 | 95,635 | 57,472 | 51,765 | 41,938 | 40,561 | 43,460 | 34,837 | 283,725 | 160,796 | 171,577 |
| Net earnings (loss) attributable to IAC shareholders | $ 76,917 | $ 96,940 | $ 58,290 | $ 53,637 | $ 40,739 | $ 40,717 | $ 43,332 | $ 34,478 | $ 285,784 | $ 159,266 | $ 174,233 |
| Per share information attributable to IAC shareholders: | |||||||||||
| Basic earnings per share from continuing operations (in dollars per share) | $ 0.93 | $ 1.12 | $ 0.71 | $ 0.65 | $ 0.49 | $ 0.52 | $ 0.56 | $ 0.37 | $ 3.40 | $ 1.95 | $ 2.05 |
| Diluted earnings per share from continuing operations (in dollars per share) | $ 0.88 | $ 1.08 | $ 0.69 | $ 0.62 | $ 0.46 | $ 0.49 | $ 0.52 | $ 0.34 | $ 3.27 | $ 1.81 | $ 1.89 |
| Basic earnings per share (in dollars per share) | $ 0.93 | $ 1.17 | $ 0.70 | $ 0.64 | $ 0.46 | $ 0.46 | $ 0.50 | $ 0.42 | $ 3.42 | $ 1.85 | $ 2.01 |
| Diluted earnings per share (in dollars per share) | $ 0.88 | $ 1.13 | $ 0.67 | $ 0.61 | $ 0.43 | $ 0.43 | $ 0.47 | $ 0.38 | $ 3.29 | $ 1.71 | $ 1.85 |