Represents the closing market price per share of common stock.

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Period Type:	instant

- Definition

Represents the percentage of achievement of the predefined revenue and ROIC targets.

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- Definition

Represents high end of range of the percentage of number of granted performance units, which is used as basis of payouts under various stock option plans.

+ Details

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- Definition

Represents low end of range of the percentage of number of granted performance units, which is used as basis of payouts under various stock option plans.

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Namespace Prefix:	irm
Data Type:	us-types:percentItemType
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- Definition

Represents the period of anniversary from the date of grant.

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- Definition

Represents the qualifying age of employee for grant of performance units.

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

- Definition

This element represents the weighted average grant date fair value of restricted stock units vested.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The maximum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

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- Definition

The minimum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

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Data Type:	us-types:dateStringItemType
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- Definition

This element represents the period of time over which the entity's performance is evaluated for purposes of calculating the number of performance shares earned.

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- Definition

The length of time of the share based compensation plan offering period.

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- Definition

The number of Employee Stock Purchase Plan offering periods during the reporting period.

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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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- Definition

The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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- Definition

Percentage of total outstanding options comprised of 10-year vesting options.

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- Definition

The contractual term of the majority of share based payment awards.

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- Definition

As of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees under share-based compensation plans that have yet to vest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph A240
-Subparagraph h

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for share-based compensation plans, using a decimal to express in number of years.

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- Definition

The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period.

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Description of the estimated period of time over which an employee is required to provide service in exchange for the share-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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-Publisher FASB
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-Subparagraph a

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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-Publisher FASB
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- Definition

An entity may opt to disclose the discount rate from market value on offering date or purchase date that participants pay for shares. Typically, the participant's per share cost is the lower of the prices on the two dates.

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- Definition

The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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-Paragraph A240
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- Definition

The weighted average fair value as of the grant date of share-based award plans other than stock option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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- Definition

The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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-Paragraph A240
-Subparagraph b(2)(c)

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- Definition

The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(1)

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- Definition

The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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-Paragraph A240
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph A240
-Subparagraph b(2)(b)

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph A240
-Subparagraph b(2)(a)

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-Publisher FASB
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-Paragraph A240
-Subparagraph b(2)(b)

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- Definition

The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph A240
-Subparagraph b(2)(d)

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

The total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Number 123R
-Paragraph A240
-Subparagraph c(2)

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- Definition

The weighted average fair value as of grant dates pertaining to a share-based award plan other than a stock option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph A240
-Subparagraph b(2)(d)

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(c)

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- Definition

The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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Data Type:	xbrli:decimalItemType
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- Definition

The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(b)

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(d)

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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.

+ Details

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- Definition

An entity may opt to disclose the highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

+ Details

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Period Type:	instant

- Definition

The difference between the maximum number of shares authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares already issued upon exercise of options or other share-based awards under the plan, and 2) shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Balance Type:	na
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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance-sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(c), d(2)

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(c)

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- Definition

The weighted average period between the balance-sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ Details

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Period Type:	duration

- Definition

The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(e)

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(2)

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- Definition

The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(e)

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- Definition

The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Number 123R
-Paragraph A240
-Subparagraph b(1)(g)

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph A240
-Subparagraph b(1)(g)

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(f)

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(f)

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Period Type:	instant

- Definition

The quantity of shares issuable on stock options awarded under the plan during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(d)

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(d)

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Statement of Financial Accounting Standard (FAS)
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- Definition

As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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The weighted-average period between the balance-sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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The number of shares newly issued during the reporting period under the plan.

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Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Employee stock-based awards
Benefits of tax deductions in excess of recognized compensation cost, included in net financing cash flows			$ 57	$ 1,284
Stock Options
Employee stock-based awards
Weighted average fair value of options granted (in dollars per share)			$ 7.43	$ 8.22
Contractual term of majority of awards			10Y
Weighted average assumptions used for grants
Expected volatility (as a percent)			33.40%	32.70%
Risk-free interest rate (as a percent)			2.47%	2.63%
Expected dividend yield (as a percent)			3.00%	1.00%
Expected life of the option (in years)			6.3	6.4
Summary of option activity
Options outstanding balance, beginning of period (in shares)			12,140,560
Options granted (in shares)			1,004,673
Options exercised (in shares)			(3,094,618)
Options forfeited (in shares)			(1,966,270)
Options expired (in shares)			(91,342)
Options outstanding balance, end of period (in shares)	7,993,003		7,993,003
Options exercisable balance (in shares)	4,068,019		4,068,019
Options expected to vest (in shares)	3,584,888		3,584,888
Weighted average exercise price, options outstanding balance beginning of period (in dollars per share)			$ 24.30
Weighted average exercise price, options granted (in dollars per share)	$ 28.51		$ 28.51
Weighted average exercise price, options exercised (in dollars per share)	$ 22.28		$ 22.28
Weighted average exercise price, options forfeited (in dollars per share)	$ 25.93		$ 25.93
Weighted average exercise price, options expired (in dollars per share)	$ 28.17		$ 28.17
Weighted average exercise price, options outstanding balance end of period (in dollars per share)	$ 25.17		$ 25.17
Weighted average exercise price, options exercisable (in dollars per share)	$ 24.16		$ 24.16
Weighted average exercise price, options expected to vest (in dollars per share)	$ 26.18		$ 26.18
Weighted average remaining contractual term, options outstanding (in years)	6.86		6.86
Weighted average remaining contractual term, options exercisable (in years)			5.65
Weighted average remaining contractual term, options expected to vest (in years)			8.07
Aggregate intrinsic value, options outstanding	72,211		72,211
Aggregate intrinsic value, options exercisable	40,961		40,961
Aggregate intrinsic value, options expected to vest	28,666		28,666
Aggregate intrinsic value of stock options exercised
Aggregate intrinsic value of stock options exercised	22,862	2,461	28,909	5,964
Majority Member
Employee stock-based awards
Award vesting period (in years)			5Y
Contractual term of majority of awards			10Y
Certain options member
Employee stock-based awards
Award vesting period (in years)			10Y
Contractual term of majority of awards			12Y
Percentage of outstanding vesting options (as a percent)	6.50%		6.50%
Certain options beginning in 2011
Employee stock-based awards
Award vesting period (in years)			3Y
Percentage of outstanding vesting options (as a percent)	9.90%		9.90%
Non-employee directors Member
Employee stock-based awards
Award vesting period (in years)			1Y
Restricted Stock and Restricted Stock Units
Aggregate intrinsic value of stock options exercised
Award vesting period, minimum (in years)			3
Award vesting period, maximum (in years)			5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)			168,221
Granted (in shares)			373,351
Vested (in shares)			(18,540)
Forfeited (in shares)			(94,394)
Non-vested at the end of the period (in shares)	428,638		428,638
Weighted average grant date fair value, restricted stock and restricted stock units non-vested, beginning of period (in dollars per share)			$ 22.53
Weighted average grant date fair value, restricted stock and restricted stock units granted (in dollars per share)			$ 29.10
Weighted average grant date fair value, restricted stock and restricted stock units vested (in dollars per share)			$ 25.64
Weighted average grant date fair value, restricted stock and restricted stock units forfeited (in dollars per share)	$ 26.24		$ 26.24
Weighted average grant date fair value, restricted stock and restricted stock units non-vested, end of period (in dollars per share)	$ 27.29		$ 27.29
Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Weighted average grant date fair value, restricted stock vested	13	13	13	13
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Weighted average grant date fair value, restricted stock units vested	462		462
Performance units
Employee stock-based awards
Award vesting period (in years)			3Y
Aggregate intrinsic value of stock options exercised
Award vesting period, minimum (in years)			1
Award vesting period, maximum (in years)			3
Performance units disclosure
Percentage of number of granted PUs, low end of range (as a percent)	0.00%		0.00%
Percentage of number of granted PUs, high end of range (as a percent)	150.00%		150.00%
Performance period (in years)			1
Period of anniversary from the date of grant (in years)	1		1
Qualifying age for grant of performance units (in years)	55		55
Qualifying service period (in years)			10Y
Percentage of achievement of the predefined revenue and ROIC targets (as a percent)	100.00%		100.00%
Closing market price of common stock (in dollars per share)	$ 34.09		$ 34.09
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Granted (in shares)			154,239
Forfeited (in shares)			(39,562)
Non-vested at the end of the period (in shares)	114,677		114,677
Employee Stock Purchase Plan
Employee Stock Purchase Plan.
Employee stock purchase plan, number of offering periods	2		2
Employee stock purchase plan, duration of offering periods			6M
Employee stock purchase plan, maximum employee subscription rate percent (as a percent)	15.00%		15.00%
Employee stock purchase plan, discount percent from market price (as a percent)			95.00%
Employee stock purchase plan, shares issued in period (in shares)			82,267	137,200
Employee stock-based awards, unrecognized compensation costs on nonvested awards	$ 45,636		$ 45,636
Employee stock-based awards, unrecognized compensation costs on nonvested awards, weighted average period of recognition (in years)			3.1
Shares available for grant (in shares)	472,053		472,053