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Summary of Significant Accounting Policies - Income (Loss) Per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income (Loss) Per Share-Basic and Diluted      
Net Income (Loss) $ 183,666 $ 187,263 $ 562,149
Less: Net Income (Loss) Attributable to Noncontrolling Interests 3,510 3,029 5,168
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 180,156 $ 184,234 $ 556,981
Weighted-average shares—basic (in shares) 293,365,000 291,936,000 290,812,000
Effect of dilutive potential stock options (in shares) 2,241,000 1,435,000 1,125,068
Effect of dilutive potential RSUs and PUs (in shares) 628,000 594,000 507,109
Weighted-average shares—diluted (in shares) 296,234,000 293,965,000 292,444,177
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:      
Basic (in dollars per share) $ 0.61 $ 0.63 $ 1.92
Diluted (in dollars per share) $ 0.61 $ 0.63 $ 1.90
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 225,847 81,817 305,527