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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Income (Loss) Per Share-Basic and Diluted      
Net Income (Loss) $ 187,263 $ 562,149 $ 452,725
Less: Net Income (Loss) Attributable to Noncontrolling Interests 3,029 5,168 2,506
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 184,234 $ 556,981 $ 450,219
Weighted-average shares—basic (in shares) 291,936,000 290,812,000 289,457,000
Effect of dilutive potential stock options (in shares) 1,435,000 1,125,068 645,886
Effect of dilutive potential RSUs and PUs (in shares) 594,000 507,109 872,204
Weighted-average shares—diluted (in shares) 293,965,000 292,444,177 290,975,090
Earnings (Losses) Per Share Attributable to Iron Mountain Incorporated:      
Basic (in dollars per share) $ 0.63 $ 1.92 $ 1.56
Diluted (in dollars per share) $ 0.63 $ 1.90 $ 1.55
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 81,817 305,527 1,447,722