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Income Taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes      
Normal statute of limitation Period, federal tax purpose 3 years    
Reconciliation of unrecognized tax benefits:      
Gross tax contingencies - beginning of the period $ 51,146us-gaap_UnrecognizedTaxBenefits $ 37,563us-gaap_UnrecognizedTaxBenefits $ 31,408us-gaap_UnrecognizedTaxBenefits
Gross additions based on tax positions related to the current year 3,984us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 5,985us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 6,598us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Gross additions for tax positions of prior years 13,717us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 20,275us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3,912us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross reductions for tax positions of prior years (2,699)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (1,370)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (427)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Lapses of statutes (5,350)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1,312)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (2,829)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Settlements (4,847)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (9,995)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (1,099)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Gross tax contingencies - end of the period 55,951us-gaap_UnrecognizedTaxBenefits 51,146us-gaap_UnrecognizedTaxBenefits 37,563us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits included in other long-term liabilities 53,078irm_UnrecognizedTaxBenefitsIncludedInOtherLongTermLiabilities    
Unrecognized tax benefit included in deferred income taxes 2,873irm_UnrecognizedTaxBenefitsIncludedInDeferredIncomeTaxes    
Unrecognized tax benefits, net of federal tax benefit 41,990irm_UnrecognizedTaxBenefitsNetOfFederalTaxBenefit    
Unrecognized tax position, if recognized, that would affect the effective tax rate $ 6,560us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Minimum      
Income Taxes      
Normal Statute of Limitation Period for State Tax Purpose 3 years    
Maximum      
Income Taxes      
Normal Statute of Limitation Period for State Tax Purpose 5 years