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v3.19.3

Debt - Cash Pool (Details) $ in Thousands | Sep. 30, 2019 USD ($) cash_pool | Dec. 31, 2018 USD ($)
--- | --- | ---
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 | $ 358,200 | $ 300,800
Outstanding Debit Balances | (355,800) | (298,800)
Net Cash Position | $ 2,400 | 2,000
TRS Cash Pool |  |
Debt Instrument [Line Items] |  |
Number of cash pools | cash_pool | 1 |
Gross Cash Position | $ 302,200 | 281,500
Outstanding Debit Balances | (296,300) | (279,300)
Net Cash Position | $ 5,900 | $ 2,200

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- Definition Cash Pool Agreement, Cash Position, Gross + References No definition available. + Details
Name: | irm_CashPoolAgreementCashPositionGross
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: |