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Summary of Significant Accounting Policies - Income (Loss) Per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income (Loss) Per Share-Basic and Diluted      
Income (Loss) from Continuing Operations $ 452,725 $ 343,096 $ 268,211
Less: Net income (loss) attributable to noncontrolling interests 2,506 403 938
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) 450,219 342,693 267,273
Income (loss) from discontinued operations, net of tax 0 0 104
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 450,219 $ 342,693 $ 267,377
Weighted-average shares—basic (in shares) 289,457,000 288,183,000 286,971,000
Effect of dilutive potential stock options (in shares) 645,886 24,903 145,509
Effect of dilutive potential RSUs and PUs (in shares) 872,204 435,287 570,435
Weighted-average shares—diluted (in shares) 290,975,090 288,643,190 287,686,944
Earnings (losses) per share—basic:      
Income (loss) from continuing operations (in dollars per share) $ 1.56 $ 1.19 $ 0.93
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 0 0
Net income (loss) attributable to iron mountain incorporated (in dollars per share) 1.56 1.19 0.93
Earnings (losses) per share—diluted:      
Income (loss) from continuing operations (in dollars per share) 1.55 1.19 0.93
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 0 0
Net income (loss) attributable to iron mountain incorporated - dilute (in dollars per share) $ 1.55 $ 1.19 $ 0.93
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 1,447,722 5,663,981 4,475,745