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Summary of Significant Accounting Policies - Income (Loss) Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income (Loss) Per Share-Basic and Diluted    
Net Income (Loss) $ 41,707 $ 46,631
Less: Net (Loss) Income Attributable to Noncontrolling Interests (592) 1,028
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 42,299 $ 45,603
Weighted-average shares—basic (in shares) 290,328,000 288,756,000
Effect of dilutive potential stock options (in shares) 995,625 56,437
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 521,977 715,850
Weighted-average shares—diluted (in shares) 291,845,602 289,528,287
Basic (in dollars per share) $ 0.15 $ 0.16
Diluted (in dollars per share) $ 0.14 $ 0.16
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 755,580 4,708,068