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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income (Loss) Per Share-Basic and Diluted        
Net (Loss) Income $ (43,340) $ 34,621 $ (27,107) $ 111,646
Less: Net Income (Loss) Attributable to Noncontrolling Interests 1,581 (1,162) 1,862 1,802
Net (Loss) Income Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ (44,921) $ 35,783 $ (28,969) $ 109,844
Weighted-average shares—basic (in shares) 295,364,000 293,340,000 294,935,000 293,043,000
Effect of dilutive potential stock options (in shares) 0 2,068,000 0 1,977,000
Effect of dilutive potential RSUs and PUs (in shares) 0 430,000 0 509,000
Weighted-average shares—diluted (in shares) 295,364,000 295,838,000 294,935,000 295,529,000
Net (Loss) Income Per Share Attributable to Iron Mountain Incorporated:        
Basic (in dollars per share) $ (0.15) $ 0.12 $ (0.10) $ 0.37
Diluted (in dollars per share) $ (0.15) $ 0.12 $ (0.10) $ 0.37
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 2,413,370 506,149 2,632,028 435,957