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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income (Loss) Per Share-Basic and Diluted        
Income (loss) from continuing operations $ 92,347 $ 92,263 $ 122,823 $ 131,652
Less: Net Income (Loss) Attributable to Noncontrolling Interests 34 142 925 610
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) 92,313 92,121 121,898 131,042
Income (loss) from discontinued operations, net of tax 128 (360) 104 (822)
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 92,441 $ 91,761 $ 122,002 $ 130,220
Weighted-average shares—basic (in shares) 286,925,000 285,984,000 286,727,000 285,622,000
Effect of dilutive potential stock options (in shares) 148,629 237,708 190,016 243,636
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 407,659 347,543 570,040 415,929
Weighted-average shares—diluted (in shares) 287,481,288 286,569,251 287,487,056 286,281,565
Earnings (losses) per share—basic:        
Income (loss) from continuing operations (in dollars per share) $ 0.32 $ 0.32 $ 0.43 $ 0.46
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) 0.32 0.32 0.43 0.46
Earnings (losses) per share—diluted:        
Income (loss) from continuing operations (in dollars per share) 0.32 0.32 0.42 0.46
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) $ 0.32 $ 0.32 $ 0.42 $ 0.45
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 5,004,112 3,272,502 4,494,637 3,257,322