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Stockholders' Equity Matters (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
Dec. 22, 2014
Dec. 15, 2014
Nov. 17, 2014
Nov. 04, 2014
Oct. 15, 2014
Sep. 15, 2014
Jul. 15, 2014
May 28, 2014
Apr. 15, 2014
Mar. 14, 2014
Jan. 15, 2014
Dec. 16, 2013
Oct. 15, 2013
Sep. 11, 2013
Jul. 15, 2013
Jun. 06, 2013
Apr. 15, 2013
Mar. 14, 2013
Dec. 31, 2013
Nov. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 04, 2014
Stockholders' Equity Note                                                
Dividends declared (in dollars per share)     $ 0.4750us-gaap_CommonStockDividendsPerShareDeclared     $ 0.4750us-gaap_CommonStockDividendsPerShareDeclared   $ 0.2700us-gaap_CommonStockDividendsPerShareDeclared   $ 0.2700us-gaap_CommonStockDividendsPerShareDeclared   $ 0.2700us-gaap_CommonStockDividendsPerShareDeclared   $ 0.2700us-gaap_CommonStockDividendsPerShareDeclared   $ 0.2700us-gaap_CommonStockDividendsPerShareDeclared   $ 0.2700us-gaap_CommonStockDividendsPerShareDeclared     $ 5.3713us-gaap_CommonStockDividendsPerShareDeclared $ 1.0800us-gaap_CommonStockDividendsPerShareDeclared $ 5.1200us-gaap_CommonStockDividendsPerShareDeclared  
Special distribution declared (in dollars per share)           $ 3.6144irm_CommonStockSpecialDistributionPerShareDeclared                                    
Catch-up distribution declared (in dollars per share)     $ 0.2550irm_CommonStockCatchUpDistributionPerShareDeclared                                          
Dividends declared     $ 99,617us-gaap_DividendsCommonStock     $ 91,993us-gaap_DividendsCommonStock   $ 52,033us-gaap_DividendsCommonStock   $ 51,812us-gaap_DividendsCommonStock   $ 51,683us-gaap_DividendsCommonStock   $ 51,625us-gaap_DividendsCommonStock   $ 51,597us-gaap_DividendsCommonStock   $ 51,460us-gaap_DividendsCommonStock     $ 493,513us-gaap_DividendsCommonStock $ 208,900us-gaap_DividendsCommonStock $ 328,707us-gaap_DividendsCommonStock  
Special distribution declared           700,000irm_SpecialDistributionCommonStock                                    
Catch-up distribution declared     53,450irm_CatchUpDistributionCommonStock                                          
Dividends paid ( in dollars per share) $ 0.4750us-gaap_CommonStockDividendsPerShareCashPaid $ 0.255us-gaap_CommonStockDividendsPerShareCashPaid     $ 0.475us-gaap_CommonStockDividendsPerShareCashPaid   $ 0.27us-gaap_CommonStockDividendsPerShareCashPaid   $ 0.27us-gaap_CommonStockDividendsPerShareCashPaid   $ 0.27us-gaap_CommonStockDividendsPerShareCashPaid   $ 0.27us-gaap_CommonStockDividendsPerShareCashPaid   $ 0.27us-gaap_CommonStockDividendsPerShareCashPaid   $ 0.27us-gaap_CommonStockDividendsPerShareCashPaid              
Special distribution paid ( in dollars per share)       $ 3.6144irm_CommonStockSpecialDistributionPerShareCashPaid                                     $ 4.07irm_CommonStockSpecialDistributionPerShareCashPaid  
Dividends paid 99,617us-gaap_PaymentsOfDividendsCommonStock 53,450us-gaap_PaymentsOfDividendsCommonStock   700,000us-gaap_PaymentsOfDividendsCommonStock 91,993us-gaap_PaymentsOfDividendsCommonStock   52,033us-gaap_PaymentsOfDividendsCommonStock   51,812us-gaap_PaymentsOfDividendsCommonStock   51,683us-gaap_PaymentsOfDividendsCommonStock   51,625us-gaap_PaymentsOfDividendsCommonStock   51,597us-gaap_PaymentsOfDividendsCommonStock   51,460us-gaap_PaymentsOfDividendsCommonStock       542,298us-gaap_PaymentsOfDividendsCommonStock 206,798us-gaap_PaymentsOfDividendsCommonStock 318,845us-gaap_PaymentsOfDividendsCommonStock  
Special distribution paid                                       700,000irm_PaymentsOfSpecialDistributionCommonStock        
Amount of declared distributions                                         1,048,905us-gaap_Dividends 206,365us-gaap_Dividends 886,896us-gaap_Dividends  
Number of preferred stock purchase right entitled for each share of common stock                                     1irm_NumberOfPreferredStockPurchaseRightEntitledForEachShareOfCommonStockHeld          
Maximum amount the special distribution can be in cash           140,000irm_MaximumAmountSpecialDistributionCanBeInCash                                    
Maximum amount the special distribution can be in cash as a percent of the total special distribution           20.00%irm_MaximumAmountSpecialDistributionCanBeCashAsPercentOfTotalDistribution                                    
Number of trading days used for value of special dividend       3 days                                        
Cash portion of special distribution       $ 140,000us-gaap_PaymentsOfCapitalDistribution                                        
Common stock value for special dividend (in dollars per share)       $ 35.55irm_CommonStockPricePerShareForSpecialDividend                                       $ 35.55irm_CommonStockPricePerShareForSpecialDividend
Common stock issued in special dividend (in shares)       15,750,000us-gaap_StockDividendsShares                                        
Percent of dividends paid                                         100.00%irm_PercentageOfTotalDividendsPaid 100.00%irm_PercentageOfTotalDividendsPaid 100.00%irm_PercentageOfTotalDividendsPaid  
Nonqualified ordinary dividends                                                
Stockholders' Equity Note                                                
Percent of dividends paid                                         26.40%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_NonqualifiedOrdinaryDividendsMember
0.00%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_NonqualifiedOrdinaryDividendsMember
0.00%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_NonqualifiedOrdinaryDividendsMember
 
Qualified ordinary dividends                                                
Stockholders' Equity Note                                                
Percent of dividends paid                                         56.40%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_QualifiedOrdinaryDividendsMember
100.00%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_QualifiedOrdinaryDividendsMember
100.00%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_QualifiedOrdinaryDividendsMember
 
Return of capital                                                
Stockholders' Equity Note                                                
Percent of dividends paid                                         17.20%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_ReturnOfCapitalMember
0.00%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_ReturnOfCapitalMember
0.00%irm_PercentageOfTotalDividendsPaid
/ us-gaap_DividendsAxis
= irm_ReturnOfCapitalMember