v2.4.0.6

BENEFIT PLANS (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
BENEFIT PLANS |  |  |
Employee contribution limit per calendar year (as a percent of pre-tax earnings) | 50.00% |  |
Employer match of employee contributions of each dollar | $ 0.50 |  |
Employer contribution limit per calendar year (as a percent of compensation) | 3.00% |  |
Matching contributions for United States 401 (k) defined contribution plan | 5,000,000 | 4,900,000 | 4,500,000
Matching contributions for international employees defined contribution plan | $ 1,400,000 | $ 400,000 | $ 500,000

X
- Definition The amount of matching contributions during the period for international employees defined contribution plans. + References No definition available. + Details
Name: | iaci_DefinedContributionPlanContributionForeignPlans
Namespace Prefix: | iaci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of matching contributions during the period for United States defined contribution plans. + References No definition available. + Details
Name: | iaci_DefinedContributionPlanContributionUSPlans
Namespace Prefix: | iaci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The limit of annual employee contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
Name: | iaci_DefinedContributionPlanEmployeeContributionLimitPercentageOfCompensation
Namespace Prefix: | iaci_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The limit of annual employer contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
Name: | iaci_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation
Namespace Prefix: | iaci_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of employer's matching contribution on each dollar an employee contributes towards the plan. + References No definition available. + Details
Name: | iaci_DefinedContributionPlanEmployerMatchingContributionPerDollarOfEmployeeContribution
Namespace Prefix: | iaci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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