Cash Pool Agreement, Cash Position, Gross

No definition available.

Name:	irm_CashPoolAgreementCashPositionGross
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Balance Type:	debit
Period Type:	instant

- Definition

Cash Pool Agreement, Cash Position, Net

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Cash Pool Agreement, Outstanding Borrowings

+ References

No definition available.

+ Details

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Namespace Prefix:	irm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

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- Definition

The bond leverage ratio, per the indentures, at the end of the reporting period.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Revolving credit and term leverage ratio at the end of the reporting period.

+ References

No definition available.

+ Details

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- Definition

Represents the entity's revolving credit and term loan fixed charge coverage ratio at the end of the reporting period.

+ References

No definition available.

+ Details

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- Definition

Represents the entity's revolving credit and term loan, net secured debt lease adjusted leverage ratio at the end of the reporting period.

+ References

No definition available.

+ Details

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- Definition

Represents the period of earnings before interest, taxes, depreciation, amortization and rent expense (EBITDAR) for calculation of remaining borrowing capacity under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the option available for the Company to request additional commitments.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Par, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The percentage of capital stock or other equity interests of the first tier foreign subsidiaries of the entity that are pledged to secure certain debt instruments.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Represents the amount of payments due as a percentage of the original principal amount.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Number Of Cash Pools

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Number Of Cash Pools Utilized To Manage Global Liquidity Requirements

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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-SubTopic 10
-Section 50
-Paragraph 12
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_DebtInstrumentAxis=irm_AccountsReceivablesSecuritizationProgramMember
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Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
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Debt (Details) € in Thousands, $ in Thousands, $ in Thousands, $ in Thousands							3 Months Ended	12 Months Ended
	Mar. 29, 2018 USD ($)	Mar. 29, 2018 AUD ($)	Mar. 27, 2018 AUD ($)	Mar. 22, 2018 USD ($)	Aug. 21, 2017 USD ($)	Sep. 28, 2016 AUD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 AUD ($)	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 CAD ($)	Mar. 26, 2018	Dec. 31, 2017 AUD ($)	Jul. 31, 2017 USD ($)
Debt
Capital stock of subsidiaries pledged to secure debt (as a percent)							66.00%		66.00%	66.00%	66.00%
Debt covenants
Long-term Debt, Gross							$ 8,250,658	$ 7,129,511
Long-term Debt							$ 8,158,071	7,043,271
Number Of Cash Pools							2		2	2	2
New Credit Agreement
Debt
Average interest rate (as a percent)							3.30%		3.30%	3.30%	3.30%
New Credit Agreement \| Minimum
Debt
Commitment fee percentage							0.25%
New Credit Agreement \| Maximum
Debt
Commitment fee percentage							0.40%
Revolving Credit Facility
Debt
Repayments of Debt								807,000
Accounts Receivable Securitization Program \| Secured Debt
Debt
Maximum borrowing capacity														$ 275,000
Effective interest rate (as a percent)							2.90%		2.90%	2.90%	2.90%
Accounts Receivable from Securitization							$ 272,273
QRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position							2,600	5,700
Cash pool agreement, gross cash position							389,200	383,700
Cash pool agreement, outstanding borrowings							$ 386,600	378,000
Number Of Cash Pools Utilized To Manage Global Liquidity Requirements							1		1	1	1
TRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position							$ 18,900	0
Cash pool agreement, gross cash position							262,400	229,600
Cash pool agreement, outstanding borrowings							$ 243,500	$ 229,600
Credit Agreement
Debt
Capital stock of subsidiaries pledged to secure debt (as a percent)							66.00%		66.00%	66.00%	66.00%
Debt covenants
Net total lease adjusted leverage ratio							5.6	5.0	5.6	5.6	5.6		5.0
Net secured debt lease adjusted leverage ratio							2.4	1.6	2.4	2.4	2.4		1.6
Bond leverage ratio, per indentures							5.8	5.8	5.8	5.8	5.8		5.8
Fixed charge coverage ratio							2.2	2.1	2.2	2.2	2.2		2.1
Credit Agreement \| Minimum
Debt covenants
Fixed charge coverage ratio							1.5		1.5	1.5	1.5
Credit Agreement \| Maximum
Debt covenants
Net total lease adjusted leverage ratio							6.5		6.5	6.5	6.5
Net secured debt lease adjusted leverage ratio							4.0		4.0	4.0	4.0
Bond leverage ratio, per indentures							6.5		6.5	6.5	6.5
Revolving Credit Facility
Debt
Letters of credit outstanding							$ 54,673
Period of earnings before interest, taxes, depreciation, amortization and rent expense (EBITDAR) for calculation of remaining borrowing capacity							12 months
Remaining amount available for borrowing under credit facility							$ 895,169
Revolving Credit Facility \| New Credit Agreement
Debt
Maximum borrowing capacity					$ 1,750,000
Optional additional commitments				$ 1,260,000
Average interest rate (as a percent)							3.30%		3.30%	3.30%	3.30%
Fair Value							$ 800,158	$ 466,593
Debt covenants
Long-term Debt, Gross							800,158	466,593
Long-term Debt							$ 786,470	452,186
Revolving Credit Facility \| New Credit Agreement \| Minimum
Debt
Effective interest rate (as a percent)							1.80%		1.80%	1.80%	1.80%
Revolving Credit Facility \| New Credit Agreement \| Maximum
Debt
Effective interest rate (as a percent)							5.50%		5.50%	5.50%	5.50%
Term Loan Facility \| New Credit Agreement
Debt
Amount of quarterly installments based on the original principal (as a percentage)					3,125
Debt covenants
Long-term Debt, Gross					$ 250,000
Term Loan Facility \| New Credit Agreement \| USD
Debt covenants
Long-term Debt, Gross							$ 548,000
Term Loan Facility \| New Credit Agreement \| Canada, Dollars
Debt covenants
Long-term Debt, Gross											$ 179,000
Term Loan Facility \| New Credit Agreement \| EUR
Debt covenants
Long-term Debt, Gross \| €										€ 92,000
Term Loan Facility \| Term Loan A [Member]
Debt
Average interest rate (as a percent)							3.60%		3.60%	3.60%	3.60%
Fair Value							$ 240,625	243,750
Debt covenants
Long-term Debt, Gross							240,625	243,750
Long-term Debt							240,625	243,750
Term Loan Facility \| Term Loan B [Member]
Debt
Fair Value							700,000	0
Debt covenants
Long-term Debt, Gross							698,250	0
Long-term Debt							$ 689,552	$ 0
Loans Payable [Member] \| Term Loan B [Member] \| Term Loan Facility
Debt
Maximum borrowing capacity				$ 700,000
Effective interest rate (as a percent)							3.60%		3.60%	3.60%	3.60%
Debt Instrument, Unamortized Discount							$ 1,750
Stated interest rate (as a percent)				1.75%
Debt covenants
Par percentage												99.75%
Proceeds from issuance of debt							$ 689,850
Principal payments				$ 1,750
Euro Notes 3 Percent due 2025 [Member]
Debt
Stated interest rate (as a percent)							3.00%	3.00%	3.00%	3.00%	3.00%		3.00%
Fair Value							$ 366,014	$ 364,776
Debt covenants
Long-term Debt, Gross							369,711	359,386
Long-term Debt							$ 365,144	$ 354,695
Senior Notes 4.875 Percent due 2027
Debt
Stated interest rate (as a percent)							4.875%	4.875%	4.875%	4.875%	4.875%		4.875%
Fair Value							$ 927,500	$ 1,000,000
Debt covenants
Long-term Debt, Gross							1,000,000	1,000,000
Long-term Debt							$ 986,491	$ 986,134
Senior Notes 5.375 Percent due 2026
Debt
Stated interest rate (as a percent)							5.375%	5.375%	5.375%	5.375%	5.375%		5.375%
Fair Value							$ 240,313	$ 256,875
Debt covenants
Long-term Debt, Gross							250,000	250,000
Long-term Debt							$ 246,492	$ 246,385
CAD 5.375 Percent Senior Notes due 2023 [Member]
Debt
Stated interest rate (as a percent)							5.375%	5.375%	5.375%	5.375%	5.375%		5.375%
Fair Value							$ 196,482	$ 208,631
Debt covenants
Long-term Debt, Gross							193,826	199,171
Long-term Debt							$ 190,759	195,876
Australian Dollar Term Loan [Member]
Debt
Amount of quarterly installments based on the original principal (as a percentage)			$ 8,750			$ 6,250
Effective interest rate (as a percent)							5.90%		5.90%	5.90%	5.90%
Debt Instrument, Unamortized Discount									$ 2,231				$ 1,545
Fair Value							$ 261,662	189,049	$ 340,625
Debt covenants
Long-term Debt, Gross			$ 350,000			$ 250,000	259,431	187,504
Par percentage						99.00%
Net proceeds from sales of senior notes	$ 75,621	$ 99,000
Long-term Debt							$ 255,670	$ 184,122
Australian Dollar Term Loan [Member] \| BBSY
Debt covenants
Basis spread on variable rate			3.90%			4.30%