Summary of Significant Accounting Policies - Revenue - Estimated Amortization Expense for Contract Fulfillment Costs (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Accounting Policies [Abstract]
2024	$ 61,379
2025	44,161
2026	$ 23,353

Capitalized Contract Cost, Amortization Expense, Next Twelve Months

No definition available.

Name:	irm_CapitalizedContractCostAmortizationExpenseNextTwelveMonths
Namespace Prefix:	irm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant