Name:	iac_BusinessAcquisitionContingentConsiderationFairValueAtBalanceSheetDateCurrent
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Noncurrent portion of the fair value as of the Balance Sheet date of potential payments under the contingent consideration arrangement.

No definition available.

Name:	iac_BusinessAcquisitionContingentConsiderationFairValueAtBalanceSheetNoncurrent
Namespace Prefix:	iac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair Value, as of the Balance Sheet date, of potential cash payments under the contingent consideration arrangement with a maximum amount limit.

No definition available.

Name:	iac_BusinessAcquisitionContingentConsiderationFairValueatBalanceSheetDateWithAMaximumLimit
Namespace Prefix:	iac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Maximum amount of potential cash payments under the contingent consideration arrangement as of the Balance Sheet date.

No definition available.

Name:	iac_BusinessAcquisitionContingentConsiderationMaximumAmountAtBalanceSheetDate
Namespace Prefix:	iac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Number of Contingent Consideration Arrangements Related to Business Acquisitions

No definition available.

Name:	iac_NumberofContingentConsiderationArrangementsRelatedtoBusinessAcquisitions
Namespace Prefix:	iac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258