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BUSINESS COMBINATIONS (Details)
Share data in Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
USD ($)
|
Sep. 30, 2011
USD ($)
|
Jun. 30, 2011
USD ($)
|
Mar. 31, 2011
USD ($)
|
Dec. 31, 2010
USD ($)
|
Sep. 30, 2010
USD ($)
|
Jun. 30, 2010
USD ($)
|
Mar. 31, 2010
USD ($)
|
Dec. 31, 2011
USD ($)
year
|
Dec. 31, 2010
USD ($)
year
|
Dec. 31, 2009
USD ($)
|
Jun. 05, 2009
|
Dec. 31, 2011
Customer lists
year
|
Dec. 31, 2010
Customer lists
year
|
Dec. 31, 2011
Technology
year
|
Dec. 31, 2010
Technology
year
|
Dec. 31, 2011
Match
USD ($)
|
Dec. 31, 2010
Match
USD ($)
|
Dec. 31, 2009
Match
USD ($)
|
Dec. 31, 2011
Meetic
USD ($)
|
Dec. 31, 2010
Meetic
USD ($)
|
Sep. 30, 2011
Meetic
|
Sep. 30, 2011
Meetic
Match
USD ($)
|
Sep. 30, 2011
Meetic
Match
EUR (€)
|
Dec. 31, 2011
Meetic
Match
|
Sep. 02, 2011
Meetic
Match
USD ($)
|
Dec. 31, 2009
Meetic
Match
|
Sep. 30, 2011
Meetic
Match
Customer lists
year
|
Sep. 02, 2011
Meetic
Match
Customer lists
USD ($)
|
Sep. 30, 2011
Meetic
Match
Technology
year
|
Sep. 02, 2011
Meetic
Match
Technology
USD ($)
|
Sep. 02, 2011
Meetic
Match
Trade names
USD ($)
|
Jun. 30, 2011
OkCupid
Match
USD ($)
|
Dec. 31, 2011
OkCupid
Match
USD ($)
|
Jan. 20, 2011
OkCupid
Match
USD ($)
|
|
| Business Combination | |||||||||||||||||||||||||||||||||||
| Ownership interest acquired (as a percent) | 27.00% | 54.00% | 27.00% | ||||||||||||||||||||||||||||||||
| Shares acquired | 12.5 | ||||||||||||||||||||||||||||||||||
| Voting interest after acquisition of additional shares (as a percent) | 79.00% | ||||||||||||||||||||||||||||||||||
| Consideration for shares acquired pursuant to tender offer | $ 272,032,000 | ||||||||||||||||||||||||||||||||||
| Ownership interest after acquisition of additional shares (as a percent) | 81.00% | 81.00% | 81.00% | ||||||||||||||||||||||||||||||||
| Revenue | 596,943,000 | 516,884,000 | 485,404,000 | 460,213,000 | 451,427,000 | 412,966,000 | 394,244,000 | 378,178,000 | 2,059,444,000 | 1,636,815,000 | 1,346,695,000 | 518,027,000 | 400,723,000 | 342,598,000 | 46,100,000 | ||||||||||||||||||||
| Deferred revenue | 126,297,000 | 78,175,000 | 126,297,000 | 78,175,000 | 32,600,000 | ||||||||||||||||||||||||||||||
| Net loss | (46,164,000) | (64,051,000) | (43,142,000) | (18,220,000) | (83,196,000) | (17,645,000) | (12,835,000) | 19,324,000 | (171,577,000) | (94,352,000) | 979,912,000 | 8,600,000 | |||||||||||||||||||||||
| Equity in losses of unconsolidated affiliates, loss on adjustment to acquisition-date fair value | 11,700,000 | ||||||||||||||||||||||||||||||||||
| Currency translation adjustments reclassified out of accumulated other comprehensive income to earnings | 3,200,000 | ||||||||||||||||||||||||||||||||||
| Percentage of interest of noncontrolling interest | 19.00% | ||||||||||||||||||||||||||||||||||
| Tender offer price (in euros per share) | € 15.00 | ||||||||||||||||||||||||||||||||||
| Fair value at date of acquisition | |||||||||||||||||||||||||||||||||||
| Shares acquired pursuant to tender offer | 272,032,000 | ||||||||||||||||||||||||||||||||||
| Fair value of Equity method investment in Meetic | 132,652,000 | ||||||||||||||||||||||||||||||||||
| Noncontrolling interests, including the fair value of unvested stock awards attributable to pre-acquisition services | 101,487,000 | ||||||||||||||||||||||||||||||||||
| Total fair value at date of acquisition | 506,171,000 | ||||||||||||||||||||||||||||||||||
| Allocation of the purchase price | |||||||||||||||||||||||||||||||||||
| Cash and cash equivalents | 74,562,000 | ||||||||||||||||||||||||||||||||||
| Other current assets | 22,356,000 | ||||||||||||||||||||||||||||||||||
| Property and equipment | 9,269,000 | ||||||||||||||||||||||||||||||||||
| Goodwill | 313,314,000 | ||||||||||||||||||||||||||||||||||
| Intangible assets | 162,493,000 | ||||||||||||||||||||||||||||||||||
| Other assets | 40,800,000 | ||||||||||||||||||||||||||||||||||
| Total assets | 622,794,000 | ||||||||||||||||||||||||||||||||||
| Current liabilities | (49,382,000) | ||||||||||||||||||||||||||||||||||
| Current deferred tax liability | (12,289,000) | ||||||||||||||||||||||||||||||||||
| Other liabilities | (2,575,000) | ||||||||||||||||||||||||||||||||||
| Non-current deferred tax liabilities | (52,377,000) | ||||||||||||||||||||||||||||||||||
| Net assets | 506,171,000 | ||||||||||||||||||||||||||||||||||
| Intangible assets with indefinite lives, net | 129,438,000 | ||||||||||||||||||||||||||||||||||
| Intangible assets with definite lives, net | 18,138,000 | 14,917,000 | |||||||||||||||||||||||||||||||||
| Weighted-Average Amortization Life (in years) | 2.6 | 4.1 | 1.0 | 1.3 | 2.2 | 3.0 | 1 | 2 | |||||||||||||||||||||||||||
| Pro forma financial information | |||||||||||||||||||||||||||||||||||
| Write-off of deferred revenue | 31,000,000 | ||||||||||||||||||||||||||||||||||
| Amortization of intangible assets | 7,200,000 | 23,400,000 | |||||||||||||||||||||||||||||||||
| Revenue | 2,263,986,000 | 1,853,199,000 | |||||||||||||||||||||||||||||||||
| Net earnings attributable to IAC shareholders | 213,350,000 | 94,457,000 | |||||||||||||||||||||||||||||||||
| Basic earnings (loss) per share attributable to IAC shareholders (in dollars per share) | $ 2.46 | $ 0.89 | |||||||||||||||||||||||||||||||||
| Diluted earnings (loss) per share attributable to IAC shareholders (in dollars per share) | $ 2.26 | $ 0.89 | |||||||||||||||||||||||||||||||||
| Acquisition information | |||||||||||||||||||||||||||||||||||
| Purchase consideration paid in cash | 50,000,000 | ||||||||||||||||||||||||||||||||||
| Payment to former owners | 30,000,000 | ||||||||||||||||||||||||||||||||||
| Potential additional payment to the former owner | 10,000,000 | 40,000,000 | |||||||||||||||||||||||||||||||||
| Fair value of contingent consideration arrangement | $ 10,000,000 | ||||||||||||||||||||||||||||||||||