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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, 2024
Mar. 31, 2023
Income (Loss) Per Share-Basic and Diluted    
Net Income (Loss) $ 77,025 $ 65,535
Less: Net Income (Loss) Attributable to Noncontrolling Interests 2,964 940
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 74,061 $ 64,595
Weighted-average shares—basic (in shares) 292,746,000 291,442,000
Effect of dilutive potential stock options (in shares) 1,886,000 1,216,000
Effect of dilutive potential RSUs and PUs (in shares) 589,000 391,000
Weighted-average shares—diluted (in shares) 295,221,000 293,049,000
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:    
Basic (in dollars per share) $ 0.25 $ 0.22
Diluted (in dollars per share) $ 0.25 $ 0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 365,764 145,730