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Summary of Significant Accounting Policies 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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income (Loss) Per Share-Basic and Diluted        
(Loss) income from continuing operations $ (7,113) $ 92,347 $ 57,779 $ 122,823
Less: Net (Loss) Income Attributable to Noncontrolling Interests (27) 34 890 925
(Loss) income from continuing operations (utilized in numerator of Earnings Per Share calculation) (7,086) 92,313 56,889 121,898
Income (loss) from discontinued operations, net of tax 0 128 0 104
Net (Loss) Income Attributable to Iron Mountain Incorporated $ (7,086) $ 92,441 $ 56,889 $ 122,002
Weighted-average shares—basic (in shares) 288,071,000 286,925,000 287,955,000 286,727,000
Effect of dilutive potential stock options (in shares) 0 148,629 35,706 190,016
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 0 407,659 309,911 570,040
Weighted-average shares—diluted (in shares) 288,071,000 287,481,288 288,300,617 287,487,056
(Losses) earnings per share—basic:        
(Loss) income from continuing operations $ (0.02) $ 0.32 $ 0.20 $ 0.43
Income (loss) from discontinued operations, net of tax 0 0 0 0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) (0.02) 0.32 0.20 0.43
(Losses) earnings per share—diluted:        
(Loss) income from continuing operations (0.02) 0.32 0.20 0.42
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 0 0 0
Net (loss) income attributable to Iron Mountain Incorporated(1) $ (0.02) $ 0.32 $ 0.20 $ 0.42
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 6,836,239 5,004,112 6,174,977 4,494,637