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v3.20.2

Debt - Cash Pool (Details) $ in Thousands | Sep. 30, 2020 USD ($) cash_pool | Dec. 31, 2019 USD ($)
--- | --- | ---
Debt Instrument [Line Items] |  |
Number of cash pools | cash_pool | 2 |
QRS Cash Pool |  |
Debt Instrument [Line Items] |  |
Number of cash pools | cash_pool | 1 |
Gross Cash Position | $ 573,600 | $ 372,100
Outstanding Debit Balances | (573,000) | (369,000)
Net Cash Position | $ 600 | 3,100
TRS Cash Pool |  |
Debt Instrument [Line Items] |  |
Number of cash pools | cash_pool | 1 |
Gross Cash Position | $ 363,800 | 319,800
Outstanding Debit Balances | (362,600) | (301,300)
Net Cash Position | $ 1,200 | $ 18,500

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- Definition Cash Pool Agreement, Cash Position, Gross + References No definition available. + Details
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Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash Pool Agreement, Cash Position, Net + References No definition available. + Details
Name: | irm_CashPoolAgreementCashPositionNet
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash Pool Agreement, Number Of Cash Pools + References No definition available. + Details
Name: | irm_CashPoolAgreementNumberOfCashPools
Namespace Prefix: | irm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Cash Pool Agreement, Outstanding Borrowings + References No definition available. + Details
Name: | irm_CashPoolAgreementOutstandingBorrowings
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=irm_QRSCashPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=irm_TRSCashPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |