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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income (Loss) Per Share-Basic and Diluted        
Net (Loss) Income $ (33,665) $ 91,391 $ 77,981 $ 158,069
Less: Net (Loss) Income Attributable to Noncontrolling Interests (45) 348 1,757 2,317
Net (Loss) Income Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ (33,620) $ 91,043 $ 76,224 $ 155,752
Weighted-average shares—basic (in shares) 293,603,000 292,148,000 293,229,000 291,805,000
Effect of dilutive potential stock options (in shares) 0 1,592,000 2,143,000 1,376,000
Effect of dilutive potential RSUs and PUs (in shares) 0 529,000 540,000 434,000
Weighted-average shares—diluted (in shares) 293,603,000 294,269,000 295,912,000 293,615,000
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:        
Basic (in dollars per share) $ (0.11) $ 0.31 $ 0.26 $ 0.53
Diluted (in dollars per share) $ (0.11) $ 0.31 $ 0.26 $ 0.53
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 3,083,222 16,820 293,457 106,561