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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 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income (Loss) Per Share-Basic and Diluted                      
Income (Loss) from Continuing Operations $ 37,104 $ 108,284 $ 92,347 $ 30,476 $ 158,557 $ 77,349 $ 92,263 $ 39,389 $ 268,211 $ 367,558 $ 178,015
Less: Net income (loss) attributable to noncontrolling interests                 938 1,198 1,611
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation)                 267,273 366,360 176,404
Income (loss) from discontinued operations, net of tax 0 0 128 (24) 0 (11,605) (360) (462) 104 (12,427) (6,291)
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 37,700 $ 107,675 $ 92,441 $ 29,561 $ 157,844 $ 65,869 $ 91,761 $ 38,459 $ 267,377 $ 353,933 $ 170,113
Weighted-average shares—basic (in shares)                 286,971,000 285,913,000 265,898,000
Effect of dilutive potential stock options (in shares)                 145,509 234,558 431,071
Effect of dilutive potential RSUs and PUs (in shares)                 570,435 505,030 509,235
Effect of Over-Allotment Option (in shares)                 0 0 6,278
Weighted-average shares—diluted (in shares)                 287,686,944 286,652,588 266,844,584
Earnings (losses) per share—basic:                      
Income (loss) from continuing operations (in dollars per share) $ 0.13 $ 0.37 $ 0.32 $ 0.10 $ 0.55 $ 0.27 $ 0.32 $ 0.14 $ 0.93 $ 1.28 $ 0.66
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 0 0 0 0 (0.04) 0 0 0 (0.04) (0.02)
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) 0.13 0.37 0.32 0.10 0.55 0.23 0.32 0.13 0.93 1.24 0.64
Earnings (losses) per share—diluted:                      
Income (Loss) from Continuing Operations (in dollars per share) 0.13 0.37 0.32 0.10 0.55 0.27 0.32 0.14 0.93 1.28 0.66
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 0 0 0 0 (0.04) 0 0 0 (0.04) (0.02)
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) $ 0.13 $ 0.37 $ 0.32 $ 0.10 $ 0.55 $ 0.23 $ 0.32 $ 0.13 $ 0.93 $ 1.23 $ 0.64
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares)                 4,475,745 3,258,078 2,326,344