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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, 2025
Mar. 31, 2024
Income (Loss) Per Share-Basic and Diluted    
Net Income (Loss) $ 16,233 $ 77,025
Less: Net Income (Loss) Attributable to Noncontrolling Interests 281 2,964
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 15,952 $ 74,061
Weighted-average shares—basic (in shares) 294,507,000 292,746,000
Effect of dilutive potential stock options (in shares) 2,162,000 1,886,000
Effect of dilutive potential RSUs and PUs (in shares) 591,000 589,000
Weighted-average shares—diluted (in shares) 297,260,000 295,221,000
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:    
Basic (in dollars per share) $ 0.05 $ 0.25
Diluted (in dollars per share) $ 0.05 $ 0.25
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 98,685 365,764