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Debt - Cash Pooling (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Number of cash pools |  | 2 |
QRS Cash Pool |  |  |
Debt Instrument [Line Items] |  |  |
Cash pool agreement, borrowings, maximum | $ 10,000 |  |
Cash pool agreement, cash position, net |  | $ 2,000 | $ 5,700
Cash pool agreement, cash position, gross |  | 300,800 | 383,700
Cash pool agreement, outstanding borrowings |  | 298,800 | 378,000
TRS Cash Pool |  |  |
Debt Instrument [Line Items] |  |  |
Cash pool agreement, cash position, net |  | 2,200 | 0
Cash pool agreement, cash position, gross |  | 281,500 | 229,600
Cash pool agreement, outstanding borrowings |  | $ 279,300 | $ 229,600

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

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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, 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 Number Of Cash Pools + References No definition available. + Details
Name: | irm_NumberOfCashPools
Namespace Prefix: | irm_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
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- Details
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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: |