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STOCK-BASED COMPENSATION (Details) (USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock-based compensation        
Number of active plans   3iaci_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfActivePlans    
Shares available for grant   9,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Stated term (in years)   10 years    
Unrecognized compensation cost, net of estimated forfeitures   $ 113,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Weighted average period over which cost is expected to be recognized (in years)   2 years 4 months 24 days    
Tax benefit recognized related to stock-based compensation   22,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 19,300,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 31,300,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Additional disclosures        
Intrinsic value of stock options exercised   63,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 65,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 84,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Non-cash compensation expense   59,634,000us-gaap_AllocatedShareBasedCompensationExpense 53,005,000us-gaap_AllocatedShareBasedCompensationExpense 85,625,000us-gaap_AllocatedShareBasedCompensationExpense
Stock Options        
Stock-based compensation        
Vesting period   4 years    
Shares        
Outstanding at January 1, 2014 8,074,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8,074,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Granted   747,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Exercised   (1,790,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Forfeited   (496,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Expired   (15,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Outstanding at December 31, 2014   6,520,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8,074,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options exercisable   3,647,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Weighted Average Exercise Price        
Outstanding at January 1, 2014 $ 36.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 36.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Granted   $ 67.95us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Exercised   $ 31.88us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Forfeited   $ 46.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Expired   $ 31.13us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Outstanding at December 31, 2014   $ 41.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 36.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options exercisable   $ 33.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Weighted Average Remaining Contractual Term        
Outstanding at December 31, 2014   6 years    
Options exercisable   4 years 8 months 12 days    
Aggregate Intrinsic Value        
Outstanding at December 31, 2014   133,077,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Options exercisable   99,523,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Weighted average assumptions used in Black-Scholes option pricing model        
Expected volatility   31.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
29.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
31.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Risk-free interest rate   1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Expected term   4 years 9 months 18 days 6 years 2 months 12 days 4 years 4 months 24 days
Dividend yield   1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Additional disclosures        
Weighted average fair value of stock options granted with exercise price equal to market price of common stock (in dollars per share)   $ 16.67iaci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueWithExercisePriceEqualToMarketPrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.67iaci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueWithExercisePriceEqualToMarketPrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.69iaci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueWithExercisePriceEqualToMarketPrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted exercise price value of stock options granted with exercise price greater than market price of common stock (in dollars per share)       $ 60.00iaci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePriceWithExercisePriceGreaterThanMarketPrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted average fair value of stock options granted with exercise price greater than market price of common stock (in dollars per share)       $ 7.61iaci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueWithExercisePriceGreaterThanMarketPrice
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Cash received from stock option exercises   39,100,000us-gaap_ProceedsFromStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
40,700,000us-gaap_ProceedsFromStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
58,200,000us-gaap_ProceedsFromStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Tax benefit realized from stock option exercises   25,500,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
17,200,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
28,200,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Non-cash compensation expense 7,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ iaci_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
RSUs | Minimum        
Stock-based compensation        
Vesting period   3 years    
RSUs | Maximum        
Stock-based compensation        
Vesting period   4 years    
PSUs | Minimum        
Stock-based compensation        
Vesting period   2 years    
PSUs | Maximum        
Stock-based compensation        
Vesting period   2 years    
Former Chief Executive Officer [Member]        
Shares        
Exercised     (500,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= iaci_FormerChiefExecutiveOfficerMember
 
Additional disclosures        
Stock Option Exercises Settled in Cash     $ 9,200,000iaci_StockOptionExercisesSettledinCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= iaci_FormerChiefExecutiveOfficerMember