v3.25.4

Restructuring and Other Transformation - Restructuring Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Restructuring Reserve [Roll Forward]
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Amounts accrued	Amounts accrued
Project Matterhorn
Restructuring Reserve [Roll Forward]
Beginning balance	$ 19,978	$ 35,585
Amounts accrued	195,912	161,359
Payments	(175,631)	(176,966)
Ending balance	40,259	19,978
RESTRUCTURING \| Project Matterhorn
Restructuring Reserve [Roll Forward]
Beginning balance	6,974	10,731
Amounts accrued	86,287	51,082
Payments	(67,033)	(54,839)
Ending balance	26,228	6,974
OTHER TRANSFORMATION \| Project Matterhorn
Restructuring Reserve [Roll Forward]
Beginning balance	13,004	24,854
Amounts accrued	109,625	110,277
Payments	(108,598)	(122,127)
Ending balance	$ 14,031	$ 13,004

Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag

+ References

No definition available.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

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IRON MOUNTAIN INC 10-K