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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Income (Loss) Per Share-Basic and Diluted      
Net Income (Loss) $ 562,149 $ 452,725 $ 343,096
Less: Net Income (Loss) Attributable to Noncontrolling Interests 5,168 2,506 403
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 556,981 $ 450,219 $ 342,693
Weighted-average shares—basic (in shares) 290,812,000 289,457,000 288,183,000
Effect of dilutive potential stock options (in shares) 1,125,068 645,886 24,903
Effect of dilutive potential RSUs and PUs (in shares) 507,109 872,204 435,287
Weighted-average shares—diluted (in shares) 292,444,177 290,975,090 288,643,190
Earnings (Losses) Per Share Attributable to Iron Mountain Incorporated:      
Basic (in dollars per share) $ 1.92 $ 1.56 $ 1.19
Diluted (in dollars per share) $ 1.90 $ 1.55 $ 1.19
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 305,527 1,447,722 5,663,981