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Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubtful Accounts, Income Taxes, and Concentration of Credit Risk (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income (Loss) Per Share-Basic and Diluted        
Income (loss) from continuing operations $ 38,562 $ 108,284 $ 96,341 $ 231,107
Less: Net income (loss) attributable to noncontrolling interests 168 609 1,058 1,534
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) 38,394 107,675 95,283 229,573
Income (loss) from discontinued operations, net of tax 0 0 0 104
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 38,394 $ 107,675 $ 95,283 $ 229,677
Weighted-average shares—basic (in shares) 288,403,000 287,152,000 288,105,000 286,869,000
Effect of dilutive potential stock options (in shares) 14,758 93,752 28,723 157,928
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 392,943 445,081 337,588 528,387
Weighted-average shares—diluted (in shares) 288,810,701 287,690,833 288,471,311 287,555,315
Earnings (losses) per share—basic:        
(Loss) Income from continuing operations (in dollars per share $ 0.13 $ 0.37 $ 0.33 $ 0.80
Income (loss) from discontinued operations, net of tax (in dollars per share) 0 0 0 0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) 0.13 0.37 0.33 0.80
Earnings (losses) per share—diluted:        
(Loss) income from continuing operations (in dollars per share) 0.13 0.37 0.33 0.80
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 0 0 0
Net (loss) income attributable to Iron Mountain Incorporated (in dollars per share) $ 0.13 $ 0.37 $ 0.33 $ 0.80
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 5,529,126 4,782,661 5,959,693 4,590,645