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Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubtful Accounts, Income Taxes, and Concentration of Credit Risk (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income (Loss) Per Share-Basic and Diluted    
Net Income (Loss) $ 46,631 $ 64,892
Less: Net Income (Loss) Attributable to Noncontrolling Interests 1,028 917
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 45,603 $ 63,975
Weighted-average shares—basic (in shares) 288,756,000 287,840,000
Effect of dilutive potential stock options (in shares) 56,437 51,799
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 715,850 467,334
Weighted-average shares—diluted (in shares) 289,528,287 288,359,133
Income (Loss) from Continuing Operations, Basic (in dollars per share) $ 0.16 $ 0.22
Income (Loss) from Continuing Operations, Diluted (in dollars per share) $ 0.16 $ 0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 4,708,068 5,513,714