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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (Loss) Per Share-Basic and Diluted                      
Income from Continuing Operations $ 158,831 $ 78,628 $ 93,903 $ 45,614 $ 24,349 $ 25,382 $ 83,148 $ 58,844 $ 376,976 $ 191,723 $ 103,880
Less: Net income (loss) attributable to noncontrolling interests                 1,198 1,611 2,409
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation)                 375,778 190,112 101,471
Income (loss) from discontinued operations, net of tax 0 (11,605) (360) (462) (2,870) (1,058) (2,026) (337) (12,427) (6,291) 3,353
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 158,118 $ 67,148 $ 93,401 $ 44,684 $ 22,721 $ 24,345 $ 78,630 $ 58,125 $ 363,351 $ 183,821 $ 104,824
Weighted-average shares—basic (in shares)                 285,913,000 265,898,000 246,178,000
Effect of dilutive potential stock options (in shares)                 234,558 431,071 574,954
Effect of dilutive potential RSUs and PUs (in shares)                 505,030 509,235 514,044
Effect of Over-Allotment Option (in shares)                 0 6,278 0
Weighted-average shares—diluted (in shares)                 286,652,588 266,844,584 247,266,998
Earnings (Losses) per share-basic:                      
Income (Loss) from Continuing Operations (in dollars per share) $ 0.55 $ 0.28 $ 0.33 $ 0.16 $ 0.09 $ 0.10 $ 0.31 $ 0.22 $ 1.31 $ 0.71 $ 0.41
Income (loss) from discontinued operations, net of tax (in dollars per share) 0.00 (0.04) 0.00 0.00 (0.01) 0.00 (0.01) 0.00 (0.04) (0.02) 0.01
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) 0.55 0.23 0.33 0.16 0.08 0.09 0.30 0.22 1.27 0.69 0.43
Earnings (Losses) per share-diluted:                      
Income (Loss) from Continuing Operations (in dollars per share) 0.55 0.27 0.33 0.16 0.09 0.10 0.30 0.22 1.31 0.71 0.41
Income (loss) from discontinued operations, net of tax (in dollars per share) 0.00 (0.04) 0.00 0.00 (0.01) 0.00 (0.01) 0.00 (0.04) (0.02) 0.01
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) $ 0.55 $ 0.23 $ 0.33 $ 0.16 $ 0.08 $ 0.09 $ 0.30 $ 0.22 $ 1.27 $ 0.69 $ 0.42
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares)                 3,258,078 2,326,344 1,790,362