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Summary of Significant Accounting Policies - Estimated Amortization Expense for Contract Fulfillment Costs (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Accounting Policies [Abstract] |
2019 | $ 21,227
2020 | 12,526
2021 | $ 5,278

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

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- References No definition available. + Details
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