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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2011
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Dec. 31, 2011
Maximum
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Dec. 31, 2010
Maximum
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Dec. 31, 2011
Minimum
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Dec. 31, 2010
Minimum
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Dec. 31, 2010
Other
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Dec. 31, 2011
Other
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Dec. 31, 2009
Other
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Dec. 31, 2010
Shoebuy
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Dec. 31, 2011
Shoebuy
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Dec. 31, 2009
Shoebuy
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Dec. 31, 2009
Search & Applications
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Dec. 31, 2011
Search & Applications
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Dec. 31, 2010
Search & Applications
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Dec. 31, 2010
IAC Search & Media
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Dec. 31, 2009
IAC Search & Media
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Dec. 31, 2011
IAC Search & Media
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| Goodwill and intangible assets | |||||||||||||||||||
| Impairment charges on goodwill | $ 28,032,000 | $ 916,868,000 | $ 28,032,000 | $ 28,032,000 | $ 916,868,000 | $ 916,900,000 | |||||||||||||
| Impairment charges on indefinite-lived intangible assets | 4,500,000 | 11,000,000 | 104,100,000 | ||||||||||||||||
| Impairment charges on finite-lived intangible assets | 24,200,000 | ||||||||||||||||||
| Discount rates used for impairment assessment of goodwill (as a percent) | 20.00% | 20.00% | 13.00% | 13.00% | |||||||||||||||
| Discount rates used for impairment assessment of indefinite-lived intangible assets (as a percent) | 20.00% | 20.00% | 13.00% | 13.00% | |||||||||||||||
| Royalty rates used for impairment assessment of indefinite-lived intangible assets (as a percent) | 9.00% | 10.00% | 1.00% | 1.00% | |||||||||||||||
| Balance of goodwill and intangible assets, net | |||||||||||||||||||
| Goodwill | 989,493,000 | 967,735,000 | 1,358,524,000 | 21,712,000 | 21,719,000 | 49,774,000 | 21,712,000 | 21,719,000 | 49,744,000 | 527,604,000 | 526,444,000 | 526,681,000 | 526,681,000 | 527,604,000 | 526,444,000 | ||||
| Intangible assets with indefinite lives | 237,021,000 | 351,488,000 | 11,180,000 | 11,180,000 | 163,604,000 | 163,604,000 | |||||||||||||
| Intangible assets with definite lives, net | 8,023,000 | 26,619,000 | 1,838,000 | 3,819,000 | 6,000 | 1,181,000 | |||||||||||||
| Total goodwill and intangible assets, net | $ 1,234,537,000 | $ 1,736,631,000 | |||||||||||||||||