FUNDS HELD IN ESCROW FOR MEETIC TENDER OFFER (Details) In Thousands, except Per Share data, unless otherwise specified		1 Months Ended
Jun. 30, 2011 USD ($)	Jul. 31, 2011 Meetic EUR (€)	Jul. 08, 2011 Meetic USD ($)
Funds held in escrow for tender offer
Offer price for shares of Meetic S.A. under public tender offer (in euros per share)		€ 15.00
Percentage of shares not already owned to be purchased with funds in escrow account (as a percent)		100.00%
Funds in escrow account	$ 360,583		$ 360,583
Percentage of equity method investment remaining to be purchased (as a percent)			73.00%

The percentage of ownership remaining to be acquired of common stock or equity participation in the investee accounted for under the equity method of accounting.

No definition available.

+ Details

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Namespace Prefix:	iaci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:	iaci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of shares to be purchased with funds in escrow account that are not already owned by the entity.

+ References

No definition available.

+ Details

Name:	iaci_PercentageOfSharesToBePurchasedWithFundsInEscrowAccount
Namespace Prefix:	iaci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the offer price per share by the entity under the public tender offer.

+ References

No definition available.

+ Details

Name:	iaci_PublicTenderOfferPricePerShare
Namespace Prefix:	iaci_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant