Summary of Significant Accounting Policies - Income (Loss) Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Income (Loss) Per Share-Basic and Diluted | ||||
| Net Income (Loss) | $ 106,102 | $ (43,340) | $ 255,101 | $ (27,107) |
| Less: Net Income (Loss) Attributable to Noncontrolling Interests | 4,672 | 1,581 | 10,006 | 1,862 |
| Net Income (Loss) Attributable to Iron Mountain Incorporated | $ 101,430 | $ (44,921) | $ 245,095 | $ (28,969) |
| Weighted-average shares—basic (in shares) | 297,741,000 | 295,364,000 | 297,295,000 | 294,935,000 |
| Effect of potentially dilutive stock options (in shares) | 1,828,000 | 0 | 1,766,000 | 0 |
| Effect of potentially dilutive RSUs and PUs (in shares) | 280,000 | 0 | 281,000 | 0 |
| Weighted-average shares—diluted (in shares) | 299,849,000 | 295,364,000 | 299,342,000 | 294,935,000 |
| Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated: | ||||
| Basic (in dollars per share) | $ 0.34 | $ (0.15) | $ 0.82 | $ (0.10) |
| Diluted (in dollars per share) | $ 0.34 | $ (0.15) | $ 0.82 | $ (0.10) |
| Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) | 76,397 | 2,413,370 | 153,039 | 2,632,028 |
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- Definition This element refers to the incremental common shares attributable to share based payments arrangement under stock option. No definition available.
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- Definition This element refers to the incremental common shares attributable to share based payments arrangements under restricted stock, restricted stock units and performance units. No definition available.
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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