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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, 2023
Mar. 31, 2022
Income (Loss) Per Share-Basic and Diluted    
Net Income (Loss) $ 65,535 $ 41,707
Less: Net Income (Loss) Attributable to Noncontrolling Interests 940 (592)
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation) $ 64,595 $ 42,299
Weighted-average shares—basic (in shares) 291,442,000 290,328,000
Effect of dilutive potential stock options (in shares) 1,216,000 995,625
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 391,000 521,977
Weighted-average shares—diluted (in shares) 293,049,000 291,845,602
Basic (in dollars per share) $ 0.22 $ 0.15
Diluted (in dollars per share) $ 0.22 $ 0.14
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 145,730 755,580