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Quarterly Results of Operations (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Results of Operations (Unaudited)                      
Total Revenues $ 777,978us-gaap_SalesRevenueServicesNet $ 782,697us-gaap_SalesRevenueServicesNet $ 786,892us-gaap_SalesRevenueServicesNet $ 770,126us-gaap_SalesRevenueServicesNet $ 768,207us-gaap_SalesRevenueServicesNet $ 755,314us-gaap_SalesRevenueServicesNet $ 754,396us-gaap_SalesRevenueServicesNet $ 746,706us-gaap_SalesRevenueServicesNet $ 3,117,693us-gaap_SalesRevenueServicesNet $ 3,024,623us-gaap_SalesRevenueServicesNet $ 3,003,955us-gaap_SalesRevenueServicesNet
Operating income (loss) 127,895us-gaap_OperatingIncomeLoss 141,476us-gaap_OperatingIncomeLoss 147,290us-gaap_OperatingIncomeLoss 132,616us-gaap_OperatingIncomeLoss 97,075us-gaap_OperatingIncomeLoss 139,958us-gaap_OperatingIncomeLoss 129,697us-gaap_OperatingIncomeLoss 122,517us-gaap_OperatingIncomeLoss 549,277us-gaap_OperatingIncomeLoss 489,247us-gaap_OperatingIncomeLoss 555,466us-gaap_OperatingIncomeLoss
Income (loss) from continuing operations 12,674us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 858us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 272,702us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 42,721us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 48,339us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 5,330us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 27,340us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 18,152us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 328,955us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 99,161us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 182,707us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Total income (loss) from discontinued operations 729us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax   (326)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (612)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (684)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (571)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (98)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 2,184us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (209)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 831us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (6,774)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Net Income (Loss) 13,403us-gaap_ProfitLoss 858us-gaap_ProfitLoss 272,376us-gaap_ProfitLoss 42,109us-gaap_ProfitLoss 47,655us-gaap_ProfitLoss 4,759us-gaap_ProfitLoss 27,242us-gaap_ProfitLoss 20,336us-gaap_ProfitLoss 328,746us-gaap_ProfitLoss 99,992us-gaap_ProfitLoss 174,048us-gaap_ProfitLoss
Net income (loss) attributable to Iron Mountain Incorporated 12,749us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 66us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 271,637us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 41,667us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 47,059us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,849us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 26,366us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 19,188us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 326,119us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 96,462us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 170,922us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings (Losses) per Share-Basic:                      
Income (Loss) from Continuing Operations (in dollars per share) $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare   $ 1.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.25us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.03us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.68us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.52us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Total (Loss) Income from Discontinued Operations (in dollars per share)               $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare     $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) $ 0.06us-gaap_EarningsPerShareBasic   $ 1.41us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.25us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ 0.14us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic $ 1.67us-gaap_EarningsPerShareBasic $ 0.51us-gaap_EarningsPerShareBasic $ 0.98us-gaap_EarningsPerShareBasic
Earnings (Losses) per Share-Diluted:                      
Income (Loss) from Continuing Operations (in dollars per share) $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare   $ 1.41us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.25us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.03us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.67us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.52us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.04us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Total (Loss) Income from Discontinued Operations (in dollars per share)               $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare     $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net Income (Loss) Attributable to Iron Mountain Incorporated ( in dollars per share) $ 0.06us-gaap_EarningsPerShareDiluted   $ 1.40us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.14us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted $ 1.66us-gaap_EarningsPerShareDiluted $ 0.50us-gaap_EarningsPerShareDiluted $ 0.98us-gaap_EarningsPerShareDiluted
Change in net income (loss)                      
Change in net income (loss) attributable to Iron Mountain Incorporated due to decrease in operating income 13,600irm_NetIncomeLossIncreaseDecreaseAttributableToOperatingIncome       42,900irm_NetIncomeLossIncreaseDecreaseAttributableToOperatingIncome            
Decrease in operating income attributable to increase (decrease) in REIT conversion         (7,100)irm_NetIncomeLossIncreaseDecreaseAttributableToRealEstateInvestmentTrustConversion            
Change in net income (loss) attributable to Iron Mountain Incorporated due to increase in interest expense 9,800irm_NetIncomeLossIncreaseDecreaseAttributableToInterestExpense                    
Offsetting the decrease in operating income and the increase in interest expense by reduction in other expenses, net         34,700irm_NetIncomeLossIncreaseDecreaseAttributableToOtherExpensesNet            
Change in net income (loss) attributable to reduction in the provision for income taxes 54,000irm_NetIncomeLossIncreaseDecreaseAttributableToIncomeTaxExpenseBenefit       50,200irm_NetIncomeLossIncreaseDecreaseAttributableToIncomeTaxExpenseBenefit            
Change in other expenses attributable to reduction in debt extinguishment charges 16,500irm_OtherExpensesIncreaseDecreaseAttributableToGainsLossesOnExtinguishmentOfDebt         43,600irm_OtherExpensesIncreaseDecreaseAttributableToGainsLossesOnExtinguishmentOfDebt          
Change in other expenses attributable to increase of foreign currency transaction losses         11,000irm_OtherExpensesIncreaseDecreaseAttributableToForeignCurrencyTransactionGainLoss            
Decrease in operating income attributable to increase in restructuring costs         18,700irm_NetIncomeLossIncreaseDecreaseAttributableToRestructuringCosts            
Decrease in operating income attributable to increase in facilities costs primarily associated with facility consolidation         11,200irm_NetIncomeLossIncreaseDecreaseAttributableToFacilitiesCostsPrimarilyAssociatedWithFacilityConsolidation            
Decrease in operating income attributable to increase in other cost         8,100irm_NetIncomeLossIncreaseDecreaseAttributableToOtherCosts            
Decrease in operating income attributable to depreciation and amortization         3,600irm_NetIncomeLossIncreaseDecreaseAttributableToDepreciationAndAmortization            
Decrease in operating income attributable to increase in bad debt expense         2,200irm_NetIncomeLossIncreaseDecreaseAttributableToBadDebtExpense            
Decrease in operating income attributable to charitable contributions         2,000irm_NetIncomeLossIncreaseDecreaseAttributableToCharitableContributions            
Decrease in operating income attributable to professional fees and charitable contributions 8,300irm_NetIncomeLossIncreaseDecreaseAttributableToProfessionalFeesAndCharitableContributions                    
Change in revenue due to unfavorable changes in foreign exchange rates 4,700irm_ChangeInRevenueDueToChangeInForeignExchangeRates                    
Quarterly Results of Operations                      
Decrease in operating income attributable to increase in sales, marketing and account management costs within North American Business Records and Information Management Business and North American Data Management Business segments         3,000irm_NetIncomeLossIncreaseDecreaseAttributableToSalesMarketingAndAccountManagementCosts            
North American Records and Information Management Business                      
Quarterly Results of Operations (Unaudited)                      
Total Revenues                 1,795,361us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= irm_NorthAmericanRecordsAndInformationManagementBusinessMember		 1,769,233us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= irm_NorthAmericanRecordsAndInformationManagementBusinessMember		 1,780,299us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= irm_NorthAmericanRecordsAndInformationManagementBusinessMember
North American Data Management                      
Quarterly Results of Operations (Unaudited)                      
Total Revenues                 $ 390,207us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= irm_NorthAmericanDataManagementBusinessMember		 $ 396,519us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= irm_NorthAmericanDataManagementBusinessMember		 $ 404,253us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= irm_NorthAmericanDataManagementBusinessMember