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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income (Loss) Per Share-Basic and Diluted        
Income (loss) from continuing operations $ 108,284 $ 77,349 $ 231,107 $ 209,001
Less: Net Income (Loss) Attributable to Noncontrolling Interests 609 (125) 1,534 485
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) 107,675 77,474 229,573 208,516
(Loss) income from discontinued operations, net of tax 0 (11,605) 104 (12,427)
Net Income (Loss) Attributable to Iron Mountain Incorporated $ 107,675 $ 65,869 $ 229,677 $ 196,089
Weighted-average shares—basic (in shares) 287,152,000 286,159,000 286,869,000 285,801,000
Effect of dilutive potential stock options (in shares) 93,752 264,451 157,928 250,574
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) 445,081 558,891 528,387 463,583
Weighted-average shares—diluted (in shares) 287,690,833 286,982,342 287,555,315 286,515,157
Earnings (losses) per share—basic:        
Income (loss) from continuing operations (in dollars per share) $ 0.37 $ 0.27 $ 0.80 $ 0.73
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 (0.04) 0 (0.04)
Net income (loss) attributable to Iron Mountain Incorporated (in dollars per share) 0.37 0.23 0.80 0.69
Earnings (losses) per share—diluted:        
Income (loss) from continuing operations (in dollars per share) 0.37 0.27 0.80 0.73
(Loss) income from discontinued operations, net of tax (in dollars per share) 0 (0.04) 0 (0.04)
Net income (loss) attributable to Iron Mountain Incorporated (in dollars per share) $ 0.37 $ 0.23 $ 0.80 $ 0.68
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) 4,782,661 3,253,975 4,590,645 3,256,206