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INCOME TAXES (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Income taxes (payable) receivable and deferred tax (liabilities) assets include in the Balance Sheet captions [Line Items]        
Increase in valuation allowance $ 36,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount      
Valuation allowance related to portion of tax loss carryforwards and other items 98,300,000iaci_DeferredTaxAssetsValuationAllowanceAmount      
Federal statutory rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Reconciliation of income tax (benefit) provision to amounts computed by applying statutory federal income tax rate to earnings (loss) from continuing operations before income taxes        
Income tax provision at the federal statutory rate of 35% 94,475,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 145,705,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 101,172,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Change in tax reserves, net (86,151,000)us-gaap_IncomeTaxReconciliationTaxContingenciesOther 1,791,000us-gaap_IncomeTaxReconciliationTaxContingenciesOther 17,703,000us-gaap_IncomeTaxReconciliationTaxContingenciesOther  
Foreign income taxed at a different statutory tax rate (8,943,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (17,428,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (16,240,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential  
State income taxes, net of effect of federal tax benefit 7,240,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 7,469,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 7,650,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes  
Non-deductible goodwill associated with the sale of Urbanspoon 6,982,000us-gaap_IncomeTaxReconciliationDispositionOfBusiness      
Non-deductible impairments for certain cost method investments 23,310,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 1,756,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 226,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses  
Other, net (1,541,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (4,791,000)us-gaap_IncomeTaxReconciliationOtherAdjustments 8,704,000us-gaap_IncomeTaxReconciliationOtherAdjustments  
Income tax provision 35,372,000us-gaap_IncomeTaxExpenseBenefit 134,502,000us-gaap_IncomeTaxExpenseBenefit 119,215,000us-gaap_IncomeTaxExpenseBenefit  
Undistributed earnings indefinitely reinvested outside United States 605,700,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Deferred tax liabilities related to non-indefinitely reinvested earnings 141,500,000iaci_DeferredTaxLiabilitiesRepatriationOfForeignEarnings      
Reconciliation of beginning and ending amount of unrecognized tax benefits, excluding interest        
Balance at January 1 275,813,000us-gaap_UnrecognizedTaxBenefits 379,281,000us-gaap_UnrecognizedTaxBenefits 351,561,000us-gaap_UnrecognizedTaxBenefits  
Additions based on tax positions related to the current year 2,159,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2,887,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 6,278,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Additions for tax positions of prior years 1,622,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3,189,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 45,287,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Reductions for tax positions of prior years (5,611,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (17,116,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (17,545,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions  
Settlements (5,092,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (78,954,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (5,349,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Expiration of applicable statutes of limitations (238,505,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (13,474,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (951,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Balance at December 31 30,386,000us-gaap_UnrecognizedTaxBenefits 275,813,000us-gaap_UnrecognizedTaxBenefits 379,281,000us-gaap_UnrecognizedTaxBenefits  
Total unrecognized tax benefits including interest       374,800,000iaci_UnrecognizedTaxBenefitsRelatedToFederalIncomeTaxesStatutesOfLimitationsExpiringRecognizedThisQuarter
Unrecognized Tax Benefits Related To Federal Income Taxes Statutes Of Limitations Expiring Recognized This Quarter That Impacted Income Tax Benefit (Provision) Continuing Operations 88,200,000iaci_UnrecognizedTaxBenefitsRelatedToFederalIncomeTaxesStatutesOfLimitationsExpiringRecognizedThisQuarterThatImpactedIncomeTaxBenefitProvisionContinuingOperations      
Unrecognized Tax Benefits Related To Federal Income Taxes Statutes Of Limitations Expiring Recognized This Quarter That Impacted Income Tax Benefit (Provision) Discontinued Operations 175,700,000iaci_UnrecognizedTaxBenefitsRelatedtoFederalIncomeTaxesStatutesofLimitationsExpiringRecognizedThisQuarterThatImpactedIncomeTaxBenefitProvisionDiscontinuedOperations      
Portion of unrecognized tax benefits related to deferred tax assets included in other non-current assets 110,900,000iaci_UnrecognizedTaxBenefitsRelatedToFederalIncomeTaxesStatutesOfLimitationsExpiringRecognizedThisQuarterThatImpactedBalanceSheet      
Unrecognized tax benefits included in accrued expenses and other current liabilities 100,100,000iaci_UnrecognizedTaxBenefitsRelatedToFederalIncomeTaxesStatutesOfLimitationsExpiringRecognizedThisQuarterThatImpactedNonCurrentDeferredTaxAssets      
Unrecognized Tax Benefits Including Tax Interest Accrued 33,200,000iaci_UnrecognizedTaxBenefitsIncludingTaxInterestAccrued 408,800,000iaci_UnrecognizedTaxBenefitsIncludingTaxInterestAccrued    
Unrecognized tax benefits, tax positions for which the ultimate deductibility is highly certain but timing is uncertain 30,500,000iaci_UnrecognizedTaxBenefitsUnrelatedToFederalIncomeTaxesStatuteOfLimitationsExpiringToBeRecognizedInSubsequentPeriodsThatWouldIncomeImpactTaxExpenseContinuingOperations      
Change In Unrecognized Tax Benefits Unrelated To The Federal Income Taxes Statute Of Limitations Expiring Reasonably Possible Within Twelve Months Of The Current Reporting Period 8,800,000iaci_ChangeInUnrecognizedTaxBenefitsUnrelatedToTheFederalIncomeTaxesStatuteOfLimitationsExpiringReasonablyPossibleWithinTwelveMonthsOfTheCurrentReportingPeriod      
Change In Unrecognized Tax Benefits Unrelated To The Federal Income Taxes Statute Of Limitations Expiring Reasonably Possible Within Twelve Months Of The Current Reporting Period, Income Tax Provision 8,400,000iaci_ChangeInUnrecognizedTaxBenefitsUnrelatedToTheFederalIncomeTaxesStatuteOfLimitationsExpiringReasonablyPossibleWithinTwelveMonthsOfTheCurrentReportingPeriodIncomeTaxProvision      
Deferred taxes related to interest on unrecognized tax benefits from continuing operations 35,300,000iaci_DeferredIncomeTaxesForInterestOnUnrecognizedTaxBenefitsContinuingOperations 2,800,000iaci_DeferredIncomeTaxesForInterestOnUnrecognizedTaxBenefitsContinuingOperations 3,100,000iaci_DeferredIncomeTaxesForInterestOnUnrecognizedTaxBenefitsContinuingOperations  
Deferred taxes related to interest on unrecognized tax benefits from discontinued operations 11,700,000iaci_DeferredIncomeTaxesForInterestOnUnrecognizedTaxBenefitsDiscontinuedOperations 800,000iaci_DeferredIncomeTaxesForInterestOnUnrecognizedTaxBenefitsDiscontinuedOperations 1,700,000iaci_DeferredIncomeTaxesForInterestOnUnrecognizedTaxBenefitsDiscontinuedOperations  
Accrued interest on unrecognized tax benefits 2,800,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 133,000,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Accrued penalties on unrecognized tax benefits 2,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 5,100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued    
Other current assets 166,742,000us-gaap_OtherAssetsCurrent 161,530,000us-gaap_OtherAssetsCurrent    
Other non-current assets 56,693,000us-gaap_OtherAssetsNoncurrent 164,685,000us-gaap_OtherAssetsNoncurrent    
Accrued Liabilities, Current (397,803,000)us-gaap_AccruedLiabilitiesCurrent (351,038,000)us-gaap_AccruedLiabilitiesCurrent    
Income taxes payable (32,635,000)us-gaap_AccruedIncomeTaxesNoncurrent (416,384,000)us-gaap_AccruedIncomeTaxesNoncurrent    
Deferred income taxes (409,529,000)us-gaap_DeferredTaxLiabilitiesNoncurrent (320,748,000)us-gaap_DeferredTaxLiabilitiesNoncurrent    
Net deferred tax liabilities (390,411,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (286,596,000)us-gaap_DeferredTaxAssetsLiabilitiesNet    
Deferred Tax (Liabilities) Assets        
Reconciliation of beginning and ending amount of unrecognized tax benefits, excluding interest        
Other current assets 17,993,000us-gaap_OtherAssetsCurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
34,381,000us-gaap_OtherAssetsCurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
   
Other non-current assets 1,380,000us-gaap_OtherAssetsNoncurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
26,000us-gaap_OtherAssetsNoncurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
   
Accrued Liabilities, Current (255,000)us-gaap_AccruedLiabilitiesCurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
(255,000)us-gaap_AccruedLiabilitiesCurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
   
Deferred income taxes (409,529,000)us-gaap_DeferredTaxLiabilitiesNoncurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
(320,748,000)us-gaap_DeferredTaxLiabilitiesNoncurrent
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
   
Net deferred tax liabilities (390,411,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
(286,596,000)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ iaci_DeferredtaxliabilitiesassetsAxis
= iaci_DeferredTaxLiabilitiesAssetsMember
   
Income Taxes (Payable) Receivable        
Reconciliation of beginning and ending amount of unrecognized tax benefits, excluding interest        
Other current assets 4,505,000us-gaap_OtherAssetsCurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
12,242,000us-gaap_OtherAssetsCurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
   
Other non-current assets 1,478,000us-gaap_OtherAssetsNoncurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
19,217,000us-gaap_OtherAssetsNoncurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
   
Accrued Liabilities, Current (41,157,000)us-gaap_AccruedLiabilitiesCurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
(16,159,000)us-gaap_AccruedLiabilitiesCurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
   
Income taxes payable (32,635,000)us-gaap_AccruedIncomeTaxesNoncurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
(416,384,000)us-gaap_AccruedIncomeTaxesNoncurrent
/ iaci_IncometaxespayablereceivableAxis
= iaci_IncomeTaxesPayableReceivableMember
   
Net income taxes payable 67,809,000iaci_Netincometaxespayable
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401,084,000iaci_Netincometaxespayable
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= iaci_IncomeTaxesPayableReceivableMember
   
Continuing Operations [Member]        
Reconciliation of beginning and ending amount of unrecognized tax benefits, excluding interest        
Unrecognized Tax Benefits, Interest on Income Taxes Expense 58,500,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
/ iaci_ContinuingOperationsorDiscontinuedOperationsAxis
= us-gaap_SegmentContinuingOperationsMember
4,800,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
/ iaci_ContinuingOperationsorDiscontinuedOperationsAxis
= us-gaap_SegmentContinuingOperationsMember
5,200,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
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= us-gaap_SegmentContinuingOperationsMember
 
Discontinued Operations [Member]        
Reconciliation of beginning and ending amount of unrecognized tax benefits, excluding interest        
Unrecognized Tax Benefits, Interest on Income Taxes Expense $ 19,700,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
/ iaci_ContinuingOperationsorDiscontinuedOperationsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 1,400,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
/ iaci_ContinuingOperationsorDiscontinuedOperationsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 2,800,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
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