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Summary of Significant Accounting Policies - Immaterial Restatements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Selling, general and administrative $ 239,156 $ 259,929 $ 762,479 $ 789,324      
Total Operating Expenses 838,750 865,356 2,607,730 2,610,058      
Operating Income (Loss) 223,474 195,635 575,264 554,214      
Interest Expense, Net (106,677) (103,938) (314,427) (303,836)      
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes 130,212 91,372 274,234 248,958      
Provision (Benefit) for Income Taxes 21,928 14,023 43,127 39,957      
Income (Loss) from Continuing Operations 108,284 77,349 231,107 209,001      
Net Income (Loss) 108,284 65,744 231,211 196,574      
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 107,675 $ 65,869 $ 229,677 $ 196,089      
Income (Loss) from Continuing Operations (in dollars per share) $ 0.37 $ 0.27 $ 0.80 $ 0.73      
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) 0.37 0.23 0.80 0.69      
Income (Loss) from Continuing Operations (in dollars per share) 0.37 0.27 0.80 0.73      
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) $ 0.37 $ 0.23 $ 0.80 $ 0.68      
Total Other Assets, Net $ 7,816,555   $ 7,816,555   $ 6,159,547    
Total Assets 13,577,167 $ 11,810,870 13,577,167 $ 11,810,870 11,857,218    
Accrued expenses and other current liabilities 888,021   888,021   780,781    
Total Current Liabilities 1,830,111   1,830,111   1,490,775    
(Distributions in excess of earnings) Earnings in excess of distributions (2,433,802)   (2,433,802)   (2,139,493)    
Total Iron Mountain Incorporated Stockholders' Equity $ 1,510,830   $ 1,510,830   1,861,054    
Restatement              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Selling, general and administrative   1,459   10,798      
Total Operating Expenses   1,459   10,798      
Operating Income (Loss)   (1,459)   (10,798)      
Interest Expense, Net   97   262      
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes   (1,556)   (11,060)      
Provision (Benefit) for Income Taxes   (277)   (1,916)      
Income (Loss) from Continuing Operations   (1,279)   (9,144)      
Net Income (Loss)   (1,279)   (9,144)      
Net Income (Loss) Attributable to Iron Mountain Incorporated   $ (1,279)   $ (9,144)      
Income (Loss) from Continuing Operations (in dollars per share)   $ (0.01)   $ (0.03)      
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)   0   (0.03)      
Income (Loss) from Continuing Operations (in dollars per share)   0   (0.03)      
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)   $ 0   $ (0.04)      
Total Other Assets, Net         4,971    
Total Assets         4,971    
Accrued expenses and other current liabilities         28,097    
Total Current Liabilities         28,097    
(Distributions in excess of earnings) Earnings in excess of distributions   $ (22,852)   $ (22,852) (23,126) $ (21,573) $ (13,708)
Total Iron Mountain Incorporated Stockholders' Equity         $ (23,126)