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Summary of Significant Accounting Policies - Revenue - Estimated Amortization Expense for Contract Fulfillment Costs (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Accounting Policies [Abstract] |
2021 | $ 38,954
2022 | 24,861
2023 | $ 18,836

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- Definition Capitalized Contract Cost, Amortization Expense, Next Twelve Months + References No definition available. + Details
Name: | irm_CapitalizedContractCostAmortizationExpenseNextTwelveMonths
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Capitalized Contract Cost, Amortization Expense, Year Three + References No definition available. + Details
Name: | irm_CapitalizedContractCostAmortizationExpenseYearThree
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Capitalized Contract Cost, Amortization Expense, Year Two + References No definition available. + Details
Name: | irm_CapitalizedContractCostAmortizationExpenseYearTwo
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration