v2.4.1.9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Search & Applications | Minimum |  |
Deferred revenue |  |
Revenue recognition period | 1 year |
Search & Applications | Maximum |  |
Deferred revenue |  |
Revenue recognition period | 2 years |
Dating businesses |  |
Deferred revenue |  |
Deferred revenue | 117.9 us-gaap_DeferredRevenue / us-gaap_StatementBusinessSegmentsAxis = iaci_DatingMember | $ 116.5 us-gaap_DeferredRevenue / us-gaap_StatementBusinessSegmentsAxis = iaci_DatingMember
Dating businesses | Minimum |  |
Deferred revenue |  |
Revenue recognition period | 1 month |
Dating businesses | Maximum |  |
Deferred revenue |  |
Revenue recognition period | 6 months |
DailyBurn | Minimum |  |
Deferred revenue |  |
Revenue recognition period | 1 month |
DailyBurn | Maximum |  |
Deferred revenue |  |
Revenue recognition period | 12 months |
Media | Minimum |  |
Deferred revenue |  |
Revenue recognition period | 1 month |
Media | Maximum |  |
Deferred revenue |  |
Revenue recognition period | 1 year |
HomeAdvisor | Minimum |  |
Deferred revenue |  |
Revenue recognition period | 1 month |
HomeAdvisor | Maximum |  |
Deferred revenue |  |
Revenue recognition period | 1 year |

X
- Definition Represents the period over which deferred revenue is recognized. + References No definition available. + Details
Name: | iaci_DeferredRevenueRevenueRecognitionPeriod
Namespace Prefix: | iaci_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DeferredRevenueArrangementLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iaci_DailyBurnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iaci_DatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iaci_HomeAdvisorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iaci_MediaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iaci_SearchAndApplicationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |