XML 115 R101.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Stockholders' Equity Matters - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2018 $ / shares | Jul. 24, 2018 $ / shares | May 24, 2018 $ / shares | Feb. 14, 2018 $ / shares | Jan. 02, 2018 USD ($) | Dec. 12, 2017 USD ($) bank $ / shares shares | Oct. 24, 2017 $ / shares | Jul. 27, 2017 $ / shares | May 24, 2017 $ / shares | Feb. 15, 2017 $ / shares | Oct. 31, 2016 $ / shares | Jul. 27, 2016 $ / shares | May 25, 2016 $ / shares | Feb. 17, 2016 $ / shares | Oct. 31, 2017 USD ($) bank | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of declared distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 679,130 | $ 603,743 | $ 502,863
Dividends per share (in dollars per share) | $ / shares | $ 0.6110 | $ 0.5875 | $ 0.5875 | $ 0.5875 |  |  | $ 0.5875 | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.485 | $ 0.485 | $ 0.485 |  |  | $ 2.3753 | $ 2.2706 | $ 2.0427
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
At The Market (ATM) Equity Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banks | bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |
Sale of stock, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 273,486 | 1,481,053 |
Sale of stock consideration received on transaction, gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,800 | $ 60,000 |
Sale of stock, consideration received on transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,716 | 59,100 |
Payment of stock trading commission costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 | $ 900 |
Sale of stock, remaining aggregate sale price of stock available for distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 431,200 | $ 431,200 |  |
Equity Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banks | bank |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, consideration received on transaction |  |  |  |  |  | $ 516,462 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 37.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.38195 |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  |  |  |  |  | 2,175,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, consideration received on transaction |  |  |  |  | $ 76,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Number Of Banks + References No definition available. + Details
Name: | irm_NumberOfBanks
Namespace Prefix: | irm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payment of Stock Trading Commission Costs + References No definition available. + Details
Name: | irm_PaymentofStockTradingCommissionCosts
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments of Stock Issuance Costs Per Share + References No definition available. + Details
Name: | irm_PaymentsofStockIssuanceCostsPerShare
Namespace Prefix: | irm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale Of Stock Consideration Received On Transaction, Gross + References No definition available. + Details
Name: | irm_SaleOfStockConsiderationReceivedOnTransactionGross
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale of Stock, Authorized Amount + References No definition available. + Details
Name: | irm_SaleofStockAuthorizedAmount
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sale of Stock, Remaining Aggregate Sale Price Of Stock Available For Distribution + References No definition available. + Details
Name: | irm_SaleofStockRemainingAggregateSalePriceOfStockAvailableForDistribution
Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
Name: | us-gaap_Dividends
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=irm_AtTheMarketATMEquityProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=irm_EquityOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |