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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income (Loss) Per Share-Basic and Diluted        
Net Income (Loss) $ 34,621 $ 1,143 $ 111,646 $ 66,678
Less: Net (Loss) Income Attributable to Noncontrolling Interests (1,162) 1,029 1,802 1,969
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 35,783 $ 114 $ 109,844 $ 64,709
Weighted-average shares—basic (in shares) 293,340,000 291,825,000 293,043,000 291,633,000
Effect of dilutive potential stock options (in shares) 2,068,000 1,322,000 1,977,000 1,269,000
Effect of dilutive potential RSUs and PUs (in shares) 430,000 380,000 509,000 386,000
Weighted-average shares—diluted (in shares) 295,838,000 293,527,000 295,529,000 293,288,000
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:        
Basic (in dollars per share) $ 0.12 $ 0.00 $ 0.37 $ 0.22
Diluted (in dollars per share) $ 0.12 $ 0.00 $ 0.37 $ 0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 506,149 157,132 435,957 151,431