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Summary of Significant Accounting Policies - Immaterial Restatements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Selling, general and administrative $ 252,764 $ 252,225 $ 523,323 $ 529,395        
Total Operating Expenses 873,792 859,363 1,768,980 1,744,702        
Operating Income (Loss) 193,115 201,460 351,790 358,579        
Interest Expense, Net (105,314) (102,196) (207,750) (199,898)        
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes 102,993 118,320 144,022 157,586        
Provision (Benefit) for Income Taxes 10,646 26,057 21,199 25,934        
Income (Loss) from Continuing Operations 92,347 92,263 122,823 131,652        
Net Income (Loss) 92,475 91,903 122,927 130,830        
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 92,441 $ 91,761 $ 122,002 $ 130,220        
Income (Loss) from Continuing Operations (in dollars per share) $ 0.32 $ 0.32 $ 0.43 $ 0.46        
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) 0.32 0.32 0.43 0.46        
Income (Loss) from Continuing Operations (in dollars per share) 0.32 0.32 0.42 0.46        
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) $ 0.32 $ 0.32 $ 0.42 $ 0.45        
Total Other Assets, Net $ 7,947,320   $ 7,947,320     $ 6,159,547    
Total Assets 13,720,982 $ 11,817,159 13,720,982 $ 11,817,159   11,857,218    
Accrued expenses and other current liabilities 920,493   920,493     780,781    
Total Current Liabilities 1,616,787   1,616,787     1,490,775    
(Distributions in excess of earnings) Earnings in excess of distributions (2,364,812)   (2,364,812)     (2,139,493)    
Total Iron Mountain Incorporated Stockholders' Equity $ 1,657,821   $ 1,657,821     1,861,054    
Restatement                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Selling, general and administrative   1,899   9,339        
Total Operating Expenses   1,899   9,339        
Operating Income (Loss)   (1,899)   (9,339)        
Interest Expense, Net   89   165        
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes   (1,988)   (9,504)        
Provision (Benefit) for Income Taxes   (348)   (1,639)        
Income (Loss) from Continuing Operations   (1,640)   (7,865)        
Net Income (Loss)   (1,640)   (7,865)        
Net Income (Loss) Attributable to Iron Mountain Incorporated   $ (1,640)   $ (7,865)        
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)   (0.01)   (0.03)        
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)   $ (0.01)   $ (0.03)        
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   $ (21,573)   $ (21,573) $ (23,126) (23,126) $ (19,933) $ (13,708)
Total Iron Mountain Incorporated Stockholders' Equity           $ (23,126)