Iron Mountain (IRM) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 24, 2015
Document and Entity Information
Entity Registrant Name	IRON MOUNTAIN INC
Entity Central Index Key	1020569
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		210,555,361
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$119,605	$125,933
Restricted cash	20,000	33,860
Accounts receivable (less allowances of $32,141 and $36,538 as of December 31, 2014 and March 31, 2015, respectively)	590,026	604,265
Deferred income taxes	21,052	14,192
Prepaid expenses and other	136,790	139,469
Total Current Assets	887,473	917,719
Property, Plant and Equipment:
Property, plant and equipment	4,597,207	4,668,705
Less—Accumulated depreciation	-2,120,405	-2,117,978
Property, Plant and Equipment, net	2,476,802	2,550,727
Other Assets, net:
Goodwill	2,358,561	2,423,783
Customer relationships and acquisition costs	580,441	607,837
Deferred financing costs	45,061	47,077
Other	23,116	23,199
Total Other Assets, net	3,007,179	3,101,896
Total Assets	6,371,454	6,570,342
Current Liabilities:
Current portion of long-term debt	54,483	52,095
Accounts payable	184,406	203,014
Accrued expenses	296,247	404,485
Deferred revenue	185,195	197,142
Total Current Liabilities	720,331	856,736
Long-term Debt, net of current portion	4,667,359	4,611,436
Other Long-term Liabilities	72,363	73,506
Deferred Rent	99,021	104,051
Deferred Income Taxes	55,878	54,658
Commitments and Contingencies (see Note 7)
Iron Mountain Incorporated Stockholders' Equity:
Preferred stock (par value $0.01; authorized 10,000,000 shares; none issued and outstanding)	0	0
Common stock (par value $0.01; authorized 400,000,000 shares; issued and outstanding 209,818,812 shares and 210,527,237 shares as of December 31, 2014 and March 31, 2015, respectively)	2,105	2,098
Additional paid-in capital	1,590,828	1,588,841
Earnings in excess of distributions (Distributions in excess of earnings)	-718,996	-659,553
Accumulated other comprehensive items, net	-131,082	-75,031
Total Iron Mountain Incorporated Stockholders' Equity	742,855	856,355
Noncontrolling Interests	13,647	13,600
Total Equity	756,502	869,955
Total Liabilities and Equity	$6,371,454	$6,570,342

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Accounts receivable, allowances (in dollars)	$36,538	$32,141
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	210,527,237	209,818,812
Common stock, outstanding shares	210,527,237	209,818,812

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	0 Months Ended					3 Months Ended
In Thousands, except Share data, unless otherwise specified	Feb. 19, 2015	Nov. 17, 2014	Sep. 15, 2014	28-May-14	Mar. 14, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Storage rental						$458,872	$458,889
Service						290,414	311,237
Total Revenues						749,286	770,126
Operating Expenses:
Cost of sales (excluding depreciation and amortization)						321,654	335,145
Selling, general and administrative						196,414	214,780
Depreciation and amortization						85,951	86,433
Loss on disposal/write-down of property, plant and equipment (excluding real estate), net						333	1,152
Total Operating Expenses						604,352	637,510
Operating Income						144,934	132,616
Interest Expense (Income), Net						64,898	62,312
Other Expense, Net						22,349	5,317
Income from Continuing Operations Before Provision for Income Taxes and Gain on Sale of Real Estate						57,687	64,987
Provision for Income Taxes						15,948	29,734
Gain on Sale of Real Estate, Net of Tax						0	-7,468
Income from Continuing Operations						41,739	42,721
Loss from Discontinued Operations, Net of Tax						0	-612
Net Income						41,739	42,109
Less: Net Income Attributable to Noncontrolling Interests						643	442
Net Income Attributable to Iron Mountain Incorporated						$41,096	$41,667
Earnings (Losses) per Share—Basic:
Income (Loss) from Continuing Operations (in dollars per share)						$0.20	$0.22
Total Income (Loss) from Discontinued Operations (in dollars per share)						$0	$0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)						$0.20	$0.22
Earnings (Losses) per Share-Diluted:
Income (Loss) from Continuing Operations (in dollars per share)						$0.20	$0.22
Total Income (Loss) from Discontinued Operations (in dollars per share)						$0	$0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)						$0.19	$0.22
Weighted Average Common Shares Outstanding-Basic (in shares)						210,237,000	191,879,000
Weighted Average Common Shares Outstanding-Diluted (in shares)						212,249,088	193,069,020
Dividends Declared per Common Share (in dollars per share)	$0.48	$0.48	$0.48	$0.27	$0.27	$0.47	$0.27

CONSOLIDATED_STATEMENTS_OF_OPE1

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Interest Income	$814	$1,526

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$41,739	$42,109
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	-56,175	1,788
Market Value Adjustments for Securities	23	0
Total Other Comprehensive Income (Loss)	-56,152	1,788
Comprehensive Income (Loss)	-14,413	43,897
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	542	553
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	($14,955)	$43,344

CONSOLIDATED_STATEMENTS_OF_EQU

CONSOLIDATED STATEMENTS OF EQUITY (USD $)	Total	Common Stock	Additional Paid-in Capital	Earnings in Excess of Distributions (Distributions in Excess of Earnings)	Accumulated Other Comprehensive Items, Net	Noncontrolling Interests
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2013	$1,051,734	$1,914	$980,164	$67,820	($8,660)	$10,496
Balance (in shares) at Dec. 31, 2013		191,426,920
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	4,821	5	4,816
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		494,009
Parent cash dividends declared	-52,290			-52,290
Currency translation adjustment	1,788				1,677	111
Market Value Adjustments for Securities	0
Net Income (loss)	42,109			41,667		442
Noncontrolling interests dividends	-196					-196
Purchase of noncontrolling interests	-2,895		-395			-2,500
Balance at Mar. 31, 2014	1,045,071	1,919	984,585	57,197	-6,983	8,353
Balance (in shares) at Mar. 31, 2014		191,920,929
Balance at Dec. 31, 2014	869,955	2,098	1,588,841	-659,553	-75,031	13,600
Balance (in shares) at Dec. 31, 2014	209,818,812	209,818,812
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	1,994	7	1,987
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		708,425
Parent cash dividends declared	-100,539			-100,539
Currency translation adjustment	-56,175				-56,074	-101
Market Value Adjustments for Securities	23				23
Net Income (loss)	41,739			41,096		643
Noncontrolling interests dividends	-495					-495
Balance at Mar. 31, 2015	$756,502	$2,105	$1,590,828	($718,996)	($131,082)	$13,647
Balance (in shares) at Mar. 31, 2015	210,527,237	210,527,237

CONSOLIDATED_STATEMENTS_OF_EQU1

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Tax benefit (charge) on issuance of shares under employee stock purchase plan and option plans and stock-based compensation	$231	$185

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net Income (loss)	$41,739	$42,109
Loss (income) from discontinued operations	0	612
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation	74,791	74,713
Amortization (includes deferred financing costs and bond discount of $1,906 and $2,092, for the three months ended March 31, 2014 and 2015, respectively)	13,252	13,626
Stock-based compensation expense	6,856	7,141
Benefit for deferred income taxes	-3,273	-22,317
(Gain) Loss on disposal/write-down of property, plant and equipment, net (including real estate)	333	-8,307
Foreign currency transactions and other, net	7,241	693
Changes in Assets and Liabilities (exclusive of acquisitions):
Accounts receivable	3,437	-9,209
Prepaid expenses and other	1,964	31,441
Accounts payable	-17,995	-7,068
Accrued expenses and deferred revenue	-121,462	-77,216
Other assets and long-term liabilities	-1,371	9,423
Cash Flows from Operating Activities	5,512	55,641
Cash Flows from Investing Activities:
Capital expenditures	-74,776	-107,856
Cash paid for acquisitions, net of cash acquired	-6,431	-30,781
Increase (Decrease) in Restricted Cash	13,860	0
Additions to customer relationship and acquisition costs	-9,243	-8,158
Proceeds from sales of property and equipment and other, net (including real estate)	410	17,892
Cash Flows from Investing Activities	-76,180	-128,903
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	-2,282,261	-2,454,691
Proceeds from revolving credit and term loan facilities and other debt	2,450,403	2,876,047
Early retirement of senior subordinated notes	0	-247,275
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	-388	-2,317
Parent cash dividends	-102,539	-52,735
Proceeds from exercise of stock options and employee stock purchase plan	4,364	2,417
Excess tax (deficiency) benefit from stock-based compensation	231	-185
Payment of debt financing and stock issuance costs	-947	-422
Cash Flows from Financing Activities	68,863	120,839
Effect of Exchange Rates on Cash and Cash Equivalents	-4,523	1,803
Increase (Decrease) in Cash and Cash Equivalents	-6,328	49,380
Cash and cash equivalents, beginning of period	125,933	120,526
Cash and cash equivalents, end of period	119,605	169,906
Supplemental Information:
Cash Paid for Interest	90,339	86,232
Cash Paid for Income Taxes	10,560	9,958
Non-Cash Investing and Financing Activities:
Capital Leases	4,589	-2,183
Accrued Capital Expenditures	44,335	36,110
Dividends Payable	$4,183	$54,698

CONSOLIDATED_STATEMENTS_OF_CAS1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Cash Flows [Abstract]
Deferred financing costs and bond discount included in Amortization	$2,092	$1,906

General

General	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General
	The interim consolidated financial statements are presented herein and, in the opinion of management, reflect all adjustments of a normal recurring nature necessary for a fair presentation. Interim results are not necessarily indicative of results for a full year. Iron Mountain Incorporated, a Delaware corporation ("IMI"), and its subsidiaries ("we" or "us") store records, primarily paper documents and data backup media, and provide information management services in various locations throughout North America, Europe, Latin America and Asia Pacific. We have a diversified customer base consisting of commercial, legal, banking, healthcare, accounting, insurance, entertainment and government organizations.
	The unaudited consolidated financial statements have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been omitted pursuant to those rules and regulations, but we believe that the disclosures included herein are adequate to make the information presented not misleading. The Consolidated Financial Statements and Notes thereto, which are included herein, should be read in conjunction with the Consolidated Financial Statements and Notes thereto for the year ended December 31, 2014 included in our Annual Report on Form 10-K filed with the SEC on February 27, 2015.
	We have been organized and operating as a real estate investment trust ("REIT") for federal income tax purposes effective for our taxable year beginning January 1, 2014.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	a.    Principles of Consolidation
	The accompanying financial statements reflect our financial position, results of operations, comprehensive income (loss), equity and cash flows on a consolidated basis. All intercompany transactions and account balances have been eliminated.
	b.    Cash, Cash Equivalents and Restricted Cash
	Cash and cash equivalents include cash on hand and cash invested in highly liquid short-term securities, which have remaining maturities at the date of purchase of less than 90 days. Cash and cash equivalents are carried at cost, which approximates fair value.
	We have restricted cash associated with a collateral trust agreement with our insurance carrier related to our workers' compensation self-insurance program. The restricted cash subject to this agreement was $33,860 and $20,000 as of December 31, 2014 and March 31, 2015, respectively, and is included in current assets on our Consolidated Balance Sheets. Restricted cash consists primarily of United States Treasuries.
	c.    Foreign Currency
	Local currencies are the functional currencies for our operations outside the United States, with the exception of certain foreign holding companies and our financing centers in Switzerland, whose functional currency is the United States dollar. In those instances where the local currency is the functional currency, assets and liabilities are translated at period-end exchange rates, and revenues and expenses are translated at average exchange rates for the applicable period. Resulting translation adjustments are reflected in the accumulated other comprehensive items, net component of Iron Mountain Incorporated Stockholders' Equity and Noncontrolling Interests in the accompanying Consolidated Balance Sheets. The gain or loss on foreign currency transactions, calculated as the difference between the historical exchange rate and the exchange rate at the applicable measurement date, including those related to (1) our previously outstanding 71/4% GBP Senior Subordinated Notes due 2014 (the "71/4% Notes"), (2) our 63/4% Euro Senior Subordinated Notes due 2018 (the "63/4% Notes"), (3) borrowings in certain foreign currencies under our revolving credit facility and (4) certain foreign currency denominated intercompany obligations of our foreign subsidiaries to us and between our foreign subsidiaries, which are not considered permanently invested, are included in other expense (income), net, in the accompanying Consolidated Statements of Operations. The total gain or loss on foreign currency transactions amounted to a net loss of $6,438 and $22,266 for the three months ended March 31, 2014 and 2015, respectively.
	d.    Goodwill and Other Intangible Assets
	Goodwill and intangible assets with indefinite lives are not amortized but are reviewed annually for impairment or more frequently if impairment indicators arise. Other than goodwill, we currently have no intangible assets that have indefinite lives and which are not amortized. Separable intangible assets that are not deemed to have indefinite lives are amortized over their useful lives. We annually, or more frequently if events or circumstances warrant, assess whether a change in the lives over which our intangible assets are amortized is necessary.
	We have selected October 1 as our annual goodwill impairment review date. We performed our most recent annual goodwill impairment review as of October 1, 2014 and concluded there was no impairment of goodwill at such date. As of December 31, 2014 and March 31, 2015, no factors were identified that would alter our October 1, 2014 goodwill assessment. In making this assessment, we relied on a number of factors including operating results, business plans, anticipated future cash flows, transactions and marketplace data. There are inherent uncertainties related to these factors and our judgment in applying them to the analysis of goodwill impairment. When changes occur in the composition of one or more reporting units, the goodwill is reassigned to the reporting units affected based on their relative fair values.
	Our reporting units at which level we performed our goodwill impairment analysis as of October 1, 2014 were as follows: (1) North American Records and Information Management; (2) technology escrow services that protect and manage source code (“Intellectual Property Management”); (3) the storage, assembly and detailed reporting of customer marketing literature and delivery to sales offices, trade shows and prospective customers’ sites based on current and prospective customer orders (“Fulfillment Services”); (4) North American Data Management; (5) Emerging Businesses (which primarily relates to our data center business in the United States and which is a component of our Corporate and Other Business segment); (6) the United Kingdom, Ireland, Norway, Austria, Belgium, France, Germany, Netherlands, Spain and Switzerland (“New Western Europe”); (7) the remaining countries in Europe in which we operate, excluding Russia, Ukraine and Denmark (“Emerging Markets - Eastern Europe” (formerly referred to as the "New Emerging Markets" reporting unit)); (8) Latin America; (9) Australia and Singapore; (10) China and Hong Kong (“Greater China”); (11) India; and (12) Russia, Ukraine and Denmark.
	The carrying value of goodwill, net for each of our reporting units as of December 31, 2014 was as follows:
		Carrying Value
		as of
		31-Dec-14
	North American Records and Information Management(1)	$	1,397,484
	Intellectual Property Management(1)	38,491
	Fulfillment Services(1)	3,247
	North American Data Management(2)	375,957
	Emerging Businesses(3)	—
	New Western Europe(4)	354,049
	Emerging Markets - Eastern Europe(5)	87,408
	Latin America(5)	107,240
	Australia and Singapore(5)	55,779
	Greater China(5)	3,500
	India(5)	—
	Russia, Ukraine and Denmark(5)	628
	Total	$	2,423,783
	_______________________________________________________________________________
	-1	This reporting unit is included in the North American Records and Information Management Business segment.
	-2	This reporting unit is included in the North American Data Management Business segment.
	-3	This reporting unit is included in the Corporate and Other Business segment.
	-4	This reporting unit is included in the Western European Business segment.
	-5	This reporting unit is included in the Other International Business segment.
	Beginning January 1, 2015, as a result of the changes in our reportable operating segments associated with our reorganization (see Note 6 for a description of our reportable operating segments), we reassessed the composition of our reporting units. Our North American Records and Information Management Business segment now consists of two reporting units: (1) North American Records and Information Management (which includes Intellectual Property Management and Fulfillment Services) and (2) North American Secure Shredding. Our Western European Business segment now consists of two reporting units: (1) the United Kingdom, Ireland and Norway (“UKI”) and (2) Austria, Belgium, France, Germany, Netherlands, Spain and Switzerland (“Continental Western Europe”). We have reassigned goodwill associated with the reporting units impacted by the reorganization among the new reporting units on a relative fair value basis. The fair value of each of our new reporting units was determined based on the application of a combined weighted average approach of preliminary fair value multiples of revenue and earnings and discounted cash flow techniques. These fair values represent our best estimate and preliminary assessment of goodwill allocations to each of the new reporting units on a relative fair value basis.
	The carrying value of goodwill, net for each of our reporting units as of March 31, 2015 is as follows:
		Carrying Value
		as of
		March 31, 2015
	North American Records and Information Management(1)(2)	$	1,384,736
	North American Secure Shredding(1)(2)	40,788
	North American Data Management(3)	372,482
	Emerging Businesses(4)	—
	UKI(1)(5)	258,695
	Continental Western Europe(1)(5)	71,379
	Emerging Markets - Eastern Europe(6)	81,458
	Latin America(6)	92,993
	Australia and Singapore(6)	51,957
	Greater China(6)	3,518
	India(6)	—
	Russia, Ukraine and Denmark(6)	555
	Total	$	2,358,561
	_______________________________________________________________________________
	-1	We will finalize our preliminary estimates of fair value for these new reporting units once we finalize multi-year cash flow forecasts of such reporting units and conclude on the fair value of each new reporting unit based on the combined weighting of both fair value multiples and discounted cash flow techniques. To the extent final fair values of our new reporting units differ from our preliminary estimates, we will reassign goodwill amongst the new reporting units in a future period in which the final information is available to complete the fair values and the corresponding allocation of goodwill amongst the new reporting units.
	-2	This reporting unit is included in the North American Records and Information Management Business segment.
	-3	This reporting unit is included in the North American Data Management Business segment.
	-4	This reporting unit is included in the Corporate and Other Business segment.
	-5	This reporting unit is included in the Western European Business segment.
	-6	This reporting unit is included in the Other International Business segment.
	As a result of the change in the composition of our reporting units noted above, we concluded that we had an interim triggering event, and, therefore, during the first quarter of 2015, we performed an interim goodwill impairment test, as of January 1, 2015, for the North American Records and Information Management, North American Secure Shredding, UKI and Continental Western Europe reporting units. We concluded that the goodwill for each of our new reporting units was not impaired as of such date. While we continue to refine our preliminary estimates of fair value of certain of our new reporting units for purposes of reallocating goodwill, we do not believe that any such changes to preliminary fair value estimates will result in a change in our conclusion that there is no goodwill impairment as of January 1, 2015.
	The changes in the carrying value of goodwill attributable to each reportable operating segment for the three months ended March 31, 2015 are as follows:
		North American				North American				Western				Other International Business				Total
		Records and Information				Data				European Business								Consolidated
Management			Management
Business			Business
Gross Balance as of December 31, 2014	$	1,645,209			$	429,982			$	412,322			$	254,706			$	2,742,219
Non-deductible goodwill acquired during the year	—				—				1,546				—				1,546
Fair value and other adjustments(1)	185				—				57				(395		)		(153		)
Currency effects	(14,575		)		(3,648		)		(26,385		)		(23,684		)		(68,292		)
Gross Balance as of March 31, 2015	$	1,630,819			$	426,334			$	387,540			$	230,627			$	2,675,320
Accumulated Amortization Balance as of December 31, 2014	$	205,987			$	54,025			$	58,273			$	151			$	318,436
Currency effects	(692		)		(173		)		(807		)		(5		)		(1,677		)
Accumulated Amortization Balance as of March 31, 2015	$	205,295			$	53,852			$	57,466			$	146			$	316,759
Net Balance as of December 31, 2014	$	1,439,222			$	375,957			$	354,049			$	254,555			$	2,423,783
Net Balance as of March 31, 2015	$	1,425,524			$	372,482			$	330,074			$	230,481			$	2,358,561
Accumulated Goodwill Impairment Balance as of December 31, 2014	$	85,909			$	—			$	46,500			$	—			$	132,409
Accumulated Goodwill Impairment Balance as of March 31, 2015	$	85,909			$	—			$	46,500			$	—			$	132,409
_______________________________________________________________________________
-1	Total fair value and other adjustments primarily include $531 in net adjustments to deferred income taxes and $(4,619) related to customer relationships and acquisition costs and other assumed liabilities, as well as $3,935 of cash paid related to certain 2014 acquisitions.
The components of our amortizable intangible assets as of December 31, 2014 and March 31, 2015 are as follows:
	31-Dec-14												31-Mar-15
	Gross Carrying				Accumulated				Net Carrying				Gross Carrying				Accumulated			Net Carrying
	Amount				Amortization				Amount				Amount				Amortization			Amount
Customer Relationships and Acquisition Costs	$	904,866			$	(297,029	)		$	607,837			$	880,221			$	(299,780	)	$	580,441
Core Technology(1)	3,568				(3,540		)		28				3,349				(3,315		)	34
Trademarks and Non-Compete Agreements(1)	7,062				(5,068		)		1,994				6,469				(4,874		)	1,595
Deferred Financing Costs	63,033				(15,956		)		47,077				62,892				(17,831		)	45,061
Total	$	978,529			$	(321,593	)		$	656,936			$	952,931			$	(325,800	)	$	627,131
_______________________________________________________________________________
-1	Included in Other Assets, net in the accompanying Consolidated Balance Sheets.
Amortization expense associated with amortizable intangible assets (including deferred financing costs) was $13,626 and $13,252 for the three months ended March 31, 2014 and 2015, respectively.
e.    Stock-Based Compensation
We record stock-based compensation expense, utilizing the straight-line method, for the cost of stock options, restricted stock, restricted stock units ("RSUs"), performance units ("PUs") and shares of stock issued under our employee stock purchase plan ("ESPP") (together, "Employee Stock-Based Awards").
Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations for the three months ended March 31, 2014 and 2015 was $7,141 ($5,134 after tax or $0.03 per basic and diluted share) and $6,856 ($4,946 after tax or $0.02 per basic and diluted share), respectively.
Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations related to continuing operations is as follows:
	Three Months
	Ended
	March 31,
	2014				2015
Cost of sales (excluding depreciation and amortization)	$	190			$	45
Selling, general and administrative expenses	6,951				6,811
Total stock-based compensation	$	7,141			$	6,856
The benefits associated with the tax deductions in excess of recognized compensation cost are required to be reported as financing activities in the accompanying Consolidated Statements of Cash Flows. This requirement reduces reported operating cash flows and increases reported financing cash flows. As a result, net financing cash flows from continuing operations included $(185) and $231 for the three months ended March 31, 2014 and 2015, respectively, from the (deficiency) benefit of tax deductions compared to recognized compensation cost. The tax benefit of any resulting excess tax deduction increases the Additional Paid-in Capital ("APIC") pool. Any resulting tax deficiency is deducted from the APIC pool.
Stock Options
Under our various stock option plans, options are generally granted with exercise prices equal to the market price of the stock on the date of grant; however, in certain limited instances, options are granted at prices greater than the market price of the stock on the date of grant. Certain of the options we issue become exercisable ratably over a period of ten years from the date of grant and have a contractual life of 12 years from the date of grant, unless the holder's employment is terminated sooner. As of March 31, 2015, ten-year vesting options represented 7.2% of total outstanding options. Certain of the options we issue become exercisable ratably over a period of three years from the date of grant and have a contractual life of ten years from the date of grant, unless the holder's employment is terminated sooner. As of March 31, 2015, three-year vesting options represented 45.7% of total outstanding options. Our non-employee directors are considered employees for purposes of our stock option plans and stock option reporting. Options granted to our non-employee directors generally become exercisable one year from the date of grant. The remainder of our options became exercisable ratably over a period of five years from date of grant and generally have a contractual life of ten years from the date of grant, unless the holder's employment is terminated sooner.
The weighted average fair value of options granted for the three months ended March 31, 2014 and 2015 was $5.60 and $4.99 per share, respectively. These values were estimated on the date of grant using the Black-Scholes option pricing model. The following table summarizes the weighted average assumptions used for grants in the respective period:
		Three Months Ended
		March 31,
Weighted Average Assumptions		2014			2015
Expected volatility		33.9	%		28.6	%
Risk-free interest rate		2.06	%		1.71	%
Expected dividend yield		4	%		5	%
Expected life		6.8 years			5.5 years
Expected volatility is calculated utilizing daily historical volatility over a period that equates to the expected life of the option. The risk-free interest rate was based on the United States Treasury interest rates whose term is consistent with the expected life of the stock options. Expected dividend yield is considered in the option pricing model and represents our current annualized expected per share dividends over the current trade price of our common stock. The expected life (estimated period of time outstanding) of the stock options granted is estimated using the historical exercise behavior of employees.
A summary of option activity for the three months ended March 31, 2015 is as follows:
	Options			Weighted				Weighted		Average
				Average				Average		Intrinsic
				Exercise				Remaining		Value
				Price				Contractual
								Term (Years)
Outstanding at December 31, 2014	3,678,246			$	23.37
Granted	674,620			43.86
Exercised	(233,791	)		20.93
Forfeited	(19,119	)		23.97
Expired	(11,045	)		22.15
Outstanding at March 31, 2015	4,088,911			$	26.89			5.86		$	44,191
Options exercisable at March 31, 2015	2,725,000			$	22.74			4.42		$	37,445
Options expected to vest	1,265,183			$	34.97			8.71		$	6,435
The following table provides the aggregate intrinsic value of stock options exercised for the three months ended March 31, 2014 and 2015:
	Three Months Ended
	March 31,
	2014				2015
Aggregate intrinsic value of stock options exercised	$	977			$	4,167
Restricted Stock and Restricted Stock Units
Under our various equity compensation plans, we may also grant restricted stock or RSUs. Our restricted stock and RSUs generally have a vesting period of between three and five years from the date of grant. All RSUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of RSUs in cash upon the vesting date of the associated RSU and will be forfeited if the RSU does not vest. We accrued approximately $434 and $670 of cash dividends on RSUs for the three months ended March 31, 2014 and 2015, respectively. We paid approximately $831 and $1,729 of cash dividends on RSUs for the three months ended March 31, 2014 and 2015, respectively. The fair value of restricted stock and RSUs is the excess of the market price of our common stock at the date of grant over the purchase price (which is typically zero).
A summary of restricted stock and RSU activity for the three months ended March 31, 2015 is as follows:
	Restricted			Weighted-
	Stock and RSUs			Average
				Grant-Date
				Fair Value
Non-vested at December 31, 2014	1,405,569			$	28.78
Granted	462,323			38.82
Vested	(426,901	)		30.49
Forfeited	(29,265	)		30.43
Non-vested at March 31, 2015	1,411,726			$	31.52
No restricted stock vested during each of the three months ended March 31, 2014 and 2015. The total fair value of RSUs vested during the three months ended March 31, 2014 and 2015 was $13,844 and $15,584, respectively.
Performance Units
Under our various equity compensation plans, we may also make awards of PUs. For the majority of PUs, the number of PUs earned is determined based on our performance against predefined targets of revenue or revenue growth and return on invested capital ("ROIC"). The number of PUs earned may range from 0% to 150% (for PUs granted prior to 2014) and 0% to 200% (for PUs granted in 2014 and 2015) of the initial award. The number of PUs earned is determined based on our actual performance as compared to the targets at the end of either the one-year performance period (for PUs granted prior to 2014) or the three-year performance period (for PUs granted in 2014 and 2015). Certain PUs granted in 2013, 2014 and 2015 will be earned based on a market condition associated with the total return on our common stock in relation to a subset of the S&P 500 rather than the revenue growth and ROIC targets noted above. The number of PUs earned based on this market condition may range from 0% to 200% of the initial award. All of our PUs will be settled in shares of our common stock and are subject to cliff vesting three years from the date of the original PU grant. For those PUs subject to a one-year performance period, employees who subsequently terminate their employment after the end of the one-year performance period and on or after attaining age 55 and completing 10 years of qualifying service (the "Retirement Criteria") shall immediately and completely vest in any PUs earned based on the actual achievement against the predefined targets as discussed above (but delivery of the shares remains deferred). As a result, PUs subject to a one-year performance period are generally expensed over the shorter of (1) the vesting period, (2) achievement of the Retirement Criteria, which may occur as early as January 1 of the year following the year of grant or (3) a maximum of three years. For those PUs subject to a three-year performance period, employees who terminate their employment during the performance period and on or after meeting the Retirement Criteria are eligible for pro rated vesting, subject to the actual achievement against the predefined targets as discussed above, based on the number of full years of service completed following the grant date (but delivery of the shares remains deferred). As a result, PUs subject to a three-year performance period are generally expensed over the three-year performance period. Outstanding PUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of PUs in cash upon the settlement date of the associated PU and will be forfeited if the PU does not vest. We accrued approximately $150 and $211 of cash dividends on PUs for the three months ended March 31, 2014 and 2015, respectively. We paid approximately $221 and $1,015 of cash dividends on PUs for the three months ended March 31, 2014 and 2015, respectively.
During the three months ended March 31, 2015, we issued 131,996 PUs. Our PUs are earned based on our performance against revenue or revenue growth and ROIC targets during their applicable performance period; therefore, we forecast the likelihood of achieving the predefined revenue, revenue growth and ROIC targets in order to calculate the expected PUs to be earned. We record a compensation charge based on either the forecasted PUs to be earned (during the applicable performance period) or the actual PUs earned (at the one-year anniversary date for PUs granted prior to 2014, and at the three-year anniversary date for PUs granted in 2014 and 2015) over the vesting period for each of the awards. For PUs earned based on a market condition, we utilized a Monte Carlo simulation to fair value these awards at the date of grant, and such fair value is expensed over the three-year performance period. The total fair value of earned PUs that vested during the three months ended March 31, 2014 and 2015 was $4,030 and $2,063, respectively. As of March 31, 2015, we expected 60% and 100% achievement of the predefined revenue, revenue growth and ROIC targets associated with the awards of PUs made in 2014 and 2015, respectively.
A summary of PU activity for the three months ended March 31, 2015 is as follows:
	Original			PU Adjustment(1)			Total			Weighted-
	PU Awards						PU Awards			Average
										Grant-Date
										Fair Value
Non-vested at December 31, 2014	461,666			(82,609	)		379,057			$	30.8
Granted	131,996			—			131,996			40.58
Vested	(78,311	)		(4,769	)		(83,080	)		29.47
Forfeited	(19,038	)		—			(19,038	)		30.96
Non-vested at March 31, 2015	496,313			(87,378	)		408,935			$	34.22
_______________________________________________________________________________
-1	Represents an increase or decrease in the number of original PUs awarded based on either (a) the final performance criteria achievement at the end of the defined performance period of such PUs or (b) a change in estimated awards based on the forecasted performance against the predefined targets.
Employee Stock Purchase Plan
We offer an ESPP in which participation is available to substantially all United States and Canadian employees who meet certain service eligibility requirements. The ESPP provides a way for our eligible employees to become stockholders on favorable terms. The ESPP provides for the purchase of our common stock by eligible employees through successive offering periods. We have historically had two six-month offering periods per year, the first of which generally runs from June 1 through November 30 and the second of which generally runs from December 1 through May 31. During each offering period, participating employees accumulate after-tax payroll contributions, up to a maximum of 15% of their compensation, to pay the purchase price at the end of the offering. Participating employees may withdraw from an offering before the purchase date and obtain a refund of the amounts withheld as payroll deductions. At the end of the offering period, outstanding options under the ESPP are exercised, and each employee's accumulated contributions are used to purchase our common stock. The price for shares purchased under the ESPP is 95% of the fair market price at the end of the offering period, without a look-back feature. As a result, we do not recognize compensation expense for the ESPP shares purchased. In the three months ended March 31, 2014 and 2015, there were no offering periods which ended under the ESPP, and no shares were issued. As of March 31, 2015, we have 960,638 shares available under the ESPP.
_______________________________________________________________________________
As of March 31, 2015, unrecognized compensation cost related to the unvested portion of our Employee Stock-Based Awards was $53,880 and is expected to be recognized over a weighted-average period of 2.3 years.
We generally issue shares of our common stock for the exercises of stock options, restricted stock, RSUs, PUs and shares of our common stock under our ESPP from unissued reserved shares.
f.    Income (Loss) Per Share—Basic and Diluted
Basic income (loss) per common share is calculated by dividing income (loss) by the weighted average number of common shares outstanding. The calculation of diluted income (loss) per share is consistent with that of basic income (loss) per share but gives effect to all potential common shares (that is, securities such as options, warrants or convertible securities) that were outstanding during the period, unless the effect is antidilutive.
The following table presents the calculation of basic and diluted income (loss) per share:
	Three Months Ended
	March 31,
	2014				2015
Income (loss) from continuing operations	$	42,721			$	41,739
Total (loss) income from discontinued operations	$	(612	)		$	—
Net income (loss) attributable to Iron Mountain Incorporated	$	41,667			$	41,096
Weighted-average shares—basic	191,879,000				210,237,000
Effect of dilutive potential stock options	682,801				1,223,330
Effect of dilutive potential restricted stock, RSUs and PUs	507,219				788,758
Weighted-average shares—diluted	193,069,020				212,249,088
Earnings (losses) per share—basic:
Income (loss) from continuing operations	$	0.22			$	0.2
Total (loss) income from discontinued operations	$	—			$	—
Net income (loss) attributable to Iron Mountain Incorporated—basic	$	0.22			$	0.2
Earnings (losses) per share—diluted:
Income (loss) from continuing operations	$	0.22			$	0.2
Total (loss) income from discontinued operations	$	—			$	—
Net income (loss) attributable to Iron Mountain Incorporated—diluted	$	0.22			$	0.19
Antidilutive stock options, RSUs and PUs, excluded from the calculation	1,380,962				358,233
g.    Revenues
Our revenues consist of storage rental revenues as well as service revenues and are reflected net of sales and value added taxes. Storage rental revenues, which are considered a key driver of financial performance for the storage and information management services industry, consist primarily of recurring periodic rental charges related to the storage of materials or data (generally on a per unit basis). Service revenues include charges for related service activities, which include: (1) the handling of records, including the addition of new records, temporary removal of records from storage, refiling of removed records and the destruction of records; (2) courier operations, consisting primarily of the pickup and delivery of records upon customer request; (3) secure shredding of sensitive documents and the related sale of recycled paper, the price of which can fluctuate from period to period; (4) other services, including the scanning, imaging and document conversion services of active and inactive records, or Document Management Solutions ("DMS"), which relate to physical and digital records, and project revenues; (5) customer termination and permanent withdrawal fees; (6) data restoration projects; (7) special project work; (8) Fulfillment Services; (9) consulting services; and (10) Intellectual Property Management and other technology services and product sales (including specially designed storage containers and related supplies).
We recognize revenue when the following criteria are met: persuasive evidence of an arrangement exists, services have been rendered, the sales price is fixed or determinable and collectability of the resulting receivable is reasonably assured. Storage rental and service revenues are recognized in the month the respective storage rental or service is provided, and customers are generally billed on a monthly basis on contractually agreed-upon terms. Amounts related to future storage rental or prepaid service contracts for customers where storage rental fees or services are billed in advance are accounted for as deferred revenue and recognized ratably over the period the applicable storage rental or service is provided or performed. Revenues from the sales of products, which are included as a component of service revenues, are recognized when products are shipped and title has passed to the customer. Revenues from the sales of products have historically not been significant.
h.    Allowance for Doubtful Accounts and Credit Memo Reserves
We maintain an allowance for doubtful accounts and credit memos for estimated losses resulting from the potential inability of our customers to make required payments and potential disputes regarding billing and service issues. When calculating the allowance, we consider our past loss experience, current and prior trends in our aged receivables and credit memo activity, current economic conditions and specific circumstances of individual receivable balances. If the financial condition of our customers were to significantly change, resulting in a significant improvement or impairment of their ability to make payments, an adjustment of the allowance may be required. We charge-off uncollectible balances as circumstances warrant, generally, no later than one year past due.
i.    Income Taxes
As noted previously, we have been organized and operating as a REIT for federal income tax purposes effective for our taxable year beginning January 1, 2014. As a REIT, we are generally permitted to deduct from our federal taxable income the dividends we pay to our stockholders. The income represented by such dividends is not subject to federal taxation at the entity level but is taxed, if at all, at the stockholder level. The income of our domestic taxable REIT subsidiaries (“TRSs”), which hold our domestic operations that may not be REIT‑compliant as currently operated and structured, is subject, as applicable, to federal and state corporate income tax. In addition, we and our subsidiaries continue to be subject to foreign income taxes in jurisdictions in which they hold assets or conduct operations, regardless of whether held or conducted through subsidiaries disregarded for federal tax purposes or TRSs. We will also be subject to a separate corporate income tax on any gains recognized during a specified period (generally ten years) following the REIT conversion that are attributable to “built‑in” gains with respect to the assets that we owned on January 1, 2014; this built‑in gains tax will also be imposed on our depreciation recapture recognized into income in 2014 and subsequent taxable years as a result of accounting method changes commenced in our pre‑REIT period. If we fail to remain qualified for taxation as a REIT, we will be subject to federal income tax at regular corporate tax rates. Even if we remain qualified for taxation as a REIT, we may be subject to some federal, state, local and foreign taxes on our income and property in addition to taxes owed with respect to our TRS operations. In particular, while state income tax regimes often parallel the federal income tax regime for REITs, many states do not completely follow federal rules and some do not follow them at all.
We provide for income taxes during interim periods based on our estimate of the effective tax rate for the year. Discrete items and changes in our estimate of the annual effective tax rate are recorded in the period they occur. Our effective tax rate is subject to variability in the future due to, among other items: (1) changes in the mix of income between our qualified REIT subsidiaries and our TRSs; (2) tax law changes; (3) volatility in foreign exchange gains (losses); (4) the timing of the establishment and reversal of tax reserves; and (5) our ability to utilize net operating losses that we generate. We are subject to income taxes in the United States and numerous foreign jurisdictions. We are subject to examination by various tax authorities in jurisdictions in which we have business operations or a taxable presence. We regularly assess the likelihood of additional assessments by tax authorities and provide for these matters as appropriate. Although we believe our tax estimates are appropriate, the final determination of tax audits and any related litigation could result in changes in our estimates.
Accounting for income taxes requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the tax and financial reporting bases of assets and liabilities and for loss and credit carryforwards. Valuation allowances are provided when recovery of deferred tax assets does not meet the more likely than not standard as defined in GAAP.
We have elected to recognize interest and penalties associated with uncertain tax positions as a component of the provision (benefit) for income taxes in the accompanying Consolidated Statements of Operations. We recorded an increase of $966 and $942 for gross interest and penalties for the three months ended March 31, 2014 and 2015, respectively. We had $5,884 and $6,167 accrued for the payment of interest and penalties as of December 31, 2014 and March 31, 2015, respectively.
Our effective tax rate for the three months ended March 31, 2014 and 2015 was 45.8% and 27.6%, respectively. The primary reconciling items between the federal statutory rate of 35% and our overall effective tax rate in the three months ended March 31, 2014 were differences in the rates of tax at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates and state income taxes (net of federal tax benefit). During the three months ended March 31, 2014, there were foreign currency losses recorded in jurisdictions with tax rates lower than the federal statutory rate of 35% associated with our marking-to-market of intercompany loans, which increased our first quarter 2014 effective tax rate by 1.1%. In addition, the controlled foreign corporation look-through rule, which provided for the exception of certain foreign earnings from United States federal taxation as Subpart F income, expired on December 31, 2013 and as a result, our first quarter 2014 effective tax rate increased by 1.3%. The primary reconciling item between the federal statutory tax rate of 35% and our overall effective tax rate in the three months ended March 31, 2015 was due to differences in the rates of tax at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates.
As a REIT, we are entitled to a deduction for dividends paid, resulting in a substantial reduction of federal income tax expense. As a REIT, substantially all of our income tax expense will be incurred based on the earnings generated by our foreign subsidiaries and our domestic TRSs.
j.    Concentrations of Credit Risk
Financial instruments that potentially subject us to credit risk consist principally of cash and cash equivalents (including money market funds and time deposits), restricted cash (primarily United States Treasuries) and accounts receivable. The only significant concentrations of liquid investments as of both December 31, 2014 and March 31, 2015 relate to cash and cash equivalents and restricted cash held on deposit with three global banks and two "Triple A" rated money market funds, and three global banks and one "Triple A" rated money market fund, respectively, all of which we consider to be large, highly-rated investment-grade institutions. As per our risk management investment policy, we limit exposure to concentration of credit risk by limiting the amount invested in any one mutual fund to a maximum of $50,000 or in any one financial institution to a maximum of $75,000. As of December 31, 2014 and March 31, 2015, our cash and cash equivalents and restricted cash balance was $159,793 and $139,605, respectively, including money market funds and time deposits amounting to $53,032 and $33,909, respectively. The money market funds are invested substantially in United States Treasuries.
k.    Fair Value Measurements
Entities are permitted under GAAP to elect to measure many financial instruments and certain other items at either fair value or cost. We did not elect the fair value measurement option.
Our financial assets or liabilities that are carried at fair value are required to be measured using inputs from the three levels of the fair value hierarchy. A financial asset or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.
The three levels of the fair value hierarchy are as follows:
Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access at the measurement date.
Level 2—Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).
Level 3—Unobservable inputs that reflect our assumptions about the assumptions that market participants would use in pricing the asset or liability.
The following tables provide the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2014 and March 31, 2015, respectively:
						Fair Value Measurements at
						December 31, 2014 Using
Description		Total Carrying				Quoted prices						Significant other						Significant
		Value at				in active						observable						unobservable
		December 31,				markets						inputs						inputs
		2014				(Level 1)						(Level 2)						(Level 3)
Money Market Funds(1)		$	36,828			$	—					$	36,828					$	—
Time Deposits(1)		16,204				—						16,204						—
Trading Securities		13,172				12,428				-2		744				-1		—
Derivative Liabilities(3)		2,411				—						2,411						—
						Fair Value Measurements at
						March 31, 2015 Using
Description		Total Carrying				Quoted prices						Significant other						Significant
		Value at				in active						observable						unobservable
		March 31,				markets						inputs						inputs
		2015				(Level 1)						(Level 2)						(Level 3)
Money Market Funds(1)		$	20,000			$	—					$	20,000					$	—
Time Deposits(1)		13,909				—						13,909						—
Trading Securities		10,743				9,892				-2		851				-1		—
Derivative Liabilities(3)		7,756				—						7,756						—
_______________________________________________________________________________
-1	Money market funds and time deposits (including certain trading securities) are measured based on quoted prices for similar assets and/or subsequent transactions.
-2	Securities are measured at fair value using quoted market prices.
-3	Derivative liabilities relate to short-term (six months or less) foreign currency contracts that we have entered into to hedge certain of our intercompany exposures, as more fully disclosed at Note 3. We calculate the value of such forward contracts by adjusting the spot rate utilized at the balance sheet date for translation purposes by an estimate of the forward points observed in active markets.
Disclosures are required in the financial statements for items measured at fair value on a non-recurring basis. We did not have any material items that are measured at fair value on a non-recurring basis for the three months ended March 31, 2014 and 2015.
l.    Use of Estimates
The preparation of financial statements in conformity with GAAP requires us to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities at the date of the financial statements and for the period then ended. On an ongoing basis, we evaluate the estimates used. We base our estimates on historical experience, actuarial estimates, current conditions and various other assumptions that we believe to be reasonable under the circumstances. These estimates form the basis for making judgments about the carrying values of assets and liabilities and are not readily apparent from other sources. Actual results may differ from these estimates.
m.    Accumulated Other Comprehensive Items, Net
The changes in accumulated other comprehensive items, net for the three months ended March 31, 2014 and 2015, respectively, are as follows:
	Foreign				Market Value				Total
	Currency				Adjustments for
	Translation				Securities
	Adjustments
Balance as of December 31, 2013	$	(9,586	)		$	926			$	(8,660	)
Other comprehensive income (loss):
Foreign currency translation adjustments	1,677				—				1,677
Total other comprehensive income (loss)	1,677				—				1,677
Balance as of March 31, 2014	$	(7,909	)		$	926			$	(6,983	)
	Foreign				Market Value				Total
	Currency				Adjustments for
	Translation				Securities
	Adjustments
Balance as of December 31, 2014	$	(76,010	)		$	979			$	(75,031	)
Other comprehensive income (loss):
Foreign currency translation adjustments	(56,074		)		—				(56,074		)
Market value adjustments for securities	—				23				23
Total other comprehensive income (loss)	(56,074		)		23				(56,051		)
Balance as of March 31, 2015	$	(132,084	)		$	1,002			$	(131,082	)
n.    Other Expense, Net
Other expense, net consists of the following:
	Three Months Ended
	March 31,
	2014				2015
Foreign currency transaction losses, net	$	6,438			$	22,266
Other, net	(1,121		)		83
	$	5,317			$	22,349
o.    Property, Plant and Equipment and Long-Lived Assets
We develop various software applications for internal use. Computer software costs associated with internal use software are expensed as incurred until certain capitalization criteria are met. Payroll and related costs for employees directly associated with, and devoting time to, the development of internal use computer software projects (to the extent time is spent directly on the project) are capitalized. During the three months ended March 31, 2014 and 2015, we capitalized $4,897 and $6,040 of costs, respectively, associated with the development of internal use computer software projects. Capitalization begins when the design stage of the application has been completed and it is probable that the project will be completed and used to perform the function intended. Capitalization ends when the asset is ready for its intended use. Depreciation begins when the software is placed in service. Computer software costs that are capitalized are periodically evaluated for impairment.
We review long-lived assets and all amortizable intangible assets for impairment whenever events or changes in circumstances indicate the carrying amount of such assets may not be recoverable. Recoverability of these assets is determined by comparing the forecasted undiscounted net cash flows of the operation to which the assets relate to their carrying amount. The operations are generally distinguished by the business segment and geographic region in which they operate. If the operation is determined to be unable to recover the carrying amount of its assets, the long-lived assets are written down, on a pro rata basis, to fair value. Fair value is determined based on discounted cash flows or appraised values, depending upon the nature of the assets.
As a result of our conversion to a REIT and in accordance with SEC rules applicable to REITs, we no longer report (gain) loss on the sale of real estate as a component of operating income, but we report it as a component of income (loss) from continuing operations. We report the (gain) loss on sale of property, plant and equipment (excluding real estate), along with any impairment, write-downs or involuntary conversions related to real estate, as a component of operating income. Previously reported amounts have been reclassified to conform to this presentation.
Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $333 for the three months ended March 31, 2015 and consisted primarily of the write-off of certain property associated with our North American Records and Information Management Business segment. Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $1,152 for the three months ended March 31, 2014 and consisted primarily of losses associated with the write-off of certain software associated with our North American Records and Information Management Business segment.
Consolidated gain on sale of real estate was $7,468, net of tax of $1,991, for the three months ended March 31, 2014 associated with the sale of two buildings in the United Kingdom.
p.    New Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"). ASU 2014-09 provides additional guidance for management to reassess revenue recognition as it relates to: (1) transfer of control, (2) variable consideration, (3) allocation of transaction price based on relative standalone selling price, (3) licenses, (4) time value of money and (5) contract costs. Further disclosures will be required to provide a better understanding of revenue that has been recognized and revenue that is expected to be recognized in the future from existing contracts. ASU 2014-09 is effective for us on January 1, 2017, with no early adoption permitted. In April 2015, the FASB tentatively decided to defer the effective date of ASU 2014-09 for one year to January 1, 2018, with early adoption permitted as of January 1, 2017. We are currently evaluating the impact ASU 2014-09 will have on our consolidated financial statements.
In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements Going Concern (Subtopic 205-40) (“ASU 2014-15”). ASU 2014-15 requires management to assess an entity’s ability to continue as a going concern by incorporating and expanding upon certain principles of current United States auditing standards. Specifically, the amendments (1) provide a definition of the term “substantial doubt”, (2) require an evaluation every reporting period, including interim periods, (3) provide principles for considering the mitigating effect of management’s plans, (4) require certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) require an express statement and other disclosures when substantial doubt is still present, and (6) require an assessment for a period of one year after the date that the financial statements are issued (or available to be issued). ASU 2014‑15 is effective for us on January 1, 2017, with early adoption permitted. We do not believe that this pronouncement will have an impact on our consolidated financial statements.
In February 2015, the FASB issued ASU No. 2015‑02, Consolidation (Topic 810): Amendments to the Consolidation Analysis (“ASU 2015‑02”). ASU 2015‑02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015‑02 is effective for us on January 1, 2016, with early adoption permitted. We do not believe that this pronouncement will have an impact on our consolidated financial statements.
In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”).  The amendments in ASU 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts.  The recognition and measurement guidance for debt issuance costs are not affected by the amendments in ASU 2015-03.  ASU 2015‑03 is effective for us on January 1, 2016, with early adoption permitted.  We do not believe that this pronouncement will have a material impact on our consolidated financial statements.

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities
	Every derivative instrument is required to be recorded in the balance sheet as either an asset or a liability measured at its fair value. Periodically, we acquire derivative instruments that are intended to hedge either cash flows or values that are subject to foreign exchange or other market price risk and not for trading purposes. We have formally documented our hedging relationships, including identification of the hedging instruments and the hedged items, as well as our risk management objectives and strategies for undertaking each hedge transaction. Given the recurring nature of our revenues and the long-term nature of our asset base, we have the ability and the preference to use long-term, fixed interest rate debt to finance our business, thereby preserving our long-term returns on invested capital. We target approximately 75% of our debt portfolio to be fixed with respect to interest rates. Occasionally, we may use interest rate swaps as a tool to maintain our targeted level of fixed rate debt. In addition, we may use borrowings in foreign currencies, either obtained in the United States or by our foreign subsidiaries, to hedge foreign currency risk associated with our international investments. Sometimes we enter into currency swaps to temporarily hedge an overseas investment, such as a major acquisition, while we arrange permanent financing or to hedge our exposure due to foreign currency exchange movements related to our intercompany accounts with and between our foreign subsidiaries. As of December 31, 2014 and March 31, 2015, none of our derivative instruments contained credit-risk related contingent features.
	We have entered into a number of separate forward contracts to hedge our exposures in Euros, British pounds sterling and Australian dollars. As of March 31, 2015, we had outstanding forward contracts to purchase 206,000 Euros and sell $229,845 United States dollars to hedge our intercompany exposures with our European operations. At the maturity of the forward contracts, we may enter into new forward contracts to hedge movements in the underlying currencies. At the time of settlement, we either pay or receive the net settlement amount from the forward contract and recognize this amount in other expense (income), net in the Consolidated Statements of Operations as a realized foreign exchange gain or loss. At the end of each month, we mark the outstanding forward contracts to market and record an unrealized foreign exchange gain or loss for the mark-to-market valuation. We have not designated forward contracts as hedges. During the three months ended March 31, 2014 and 2015, there was $7,199 and $16,820 in net cash payments, respectively, included in cash from operating activities from continuing operations related to settlements associated with foreign currency forward contracts.
	Our policy is to record the fair value of each derivative instrument on a gross basis. The following table provides the fair value of our derivative instruments as of December 31, 2014 and March 31, 2015 and their gains and losses for the three months ended March 31, 2014 and 2015:
		Liability Derivatives
		31-Dec-14						31-Mar-15
	Derivatives Not Designated as	Balance Sheet		Fair				Balance Sheet		Fair
	Hedging Instruments	Location		Value				Location		Value
	Foreign exchange contracts	Accrued expenses		$	2,411			Accrued expenses		$	7,756
	Total			$	2,411					$	7,756
					Amount of (Gain)
					Loss
					Recognized in
					Income
					on Derivatives
					Three Months Ended March 31,
	Derivatives Not Designated as	Location of (Gain) Loss			2014				2015
	Hedging Instruments	Recognized in Income
		on Derivative
	Foreign exchange contracts	Other expense (income), net			$	2,922			$	28,533
	Total				$	2,922			$	28,533
	We have designated a portion of the 63/4% Notes as a hedge of net investment of certain of our Euro denominated subsidiaries. For the three months ended March 31, 2014 and 2015, we designated on average 64,208 and 36,000 Euros, respectively, of the 63/4% Notes as a hedge of net investment of certain of our Euro denominated subsidiaries. As a result, we recorded the following foreign exchange gains (losses), net of tax, related to the change in fair value of such debt due to the currency translation adjustments, which is a component of accumulated other comprehensive items, net:
		Three Months Ended March 31,
		2014				2015
	Foreign exchange gains (losses)	$	145			$	4,930
	Tax expense (benefit) on foreign exchange gains (losses)	57				—
	Foreign exchange gains (losses), net of tax	$	88			$	4,930
	As of March 31, 2015, cumulative net gains of $18,742, net of tax are recorded in accumulated other comprehensive items, net associated with this net investment hedge.

Debt

Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	Debt
	Long-term debt comprised the following:
		31-Dec-14					31-Mar-15
		Carrying			Fair		Carrying			Fair
		Amount			Value		Amount			Value
	Revolving Credit Facility(1)	$	883,428		$	883,428	$	823,881		$	823,881
	Term Loan(1)	249,375			249,375		248,750			248,750
	63/4% Euro Senior Subordinated Notes due 2018 (the "63/4% Notes")(2)(3)	308,616			309,634		273,760			274,369
	73/4% Senior Subordinated Notes due 2019 (the "73/4% Notes")(2)(3)	400,000			429,000		400,000			425,750
	83/8% Senior Subordinated Notes due 2021 (the "83/8% Notes")(2)(3)	106,030			110,500		106,038			109,836
	61/8% CAD Senior Notes due 2021 (the "CAD Notes")(2)(4)	172,420			175,437		157,470			162,194
	61/8% GBP Senior Notes due 2022 (the "GBP Notes")(2)(5)	622,960			639,282		592,160			620,998
	6% Senior Notes due 2023 (the "6% Notes")(2)(3)	600,000			625,500		600,000			631,500
	53/4% Senior Subordinated Notes due 2024 (the "53/4% Notes")(2)(3)	1,000,000			1,005,000		1,000,000			1,005,000
	Accounts Receivable Securitization Program(6)(7)	—			—		220,800			220,800
	Real Estate Mortgages, Capital Leases and Other(7)	320,702			320,702		298,983			298,983
	Total Long-term Debt	4,663,531					4,721,842
	Less Current Portion	(52,095		)			(54,483		)
	Long-term Debt, Net of Current Portion	$	4,611,436				$	4,667,359
	______________________________________________________________________________
	-1	The capital stock or other equity interests of most of our United States subsidiaries, and up to 66% of the capital stock or other equity interests of our first-tier foreign subsidiaries, are pledged to secure these debt instruments, together with all intercompany obligations (including promissory notes) of subsidiaries owed to us or to one of our United States subsidiary guarantors. In addition, Iron Mountain Canada Operations ULC ("Canada Company") has pledged 66% of the capital stock of its subsidiaries, and all intercompany obligations (including promissory notes) owed to or held by it, to secure the Canadian dollar subfacility under the Revolving Credit Facility (defined below). The fair value (Level 3 of fair value hierarchy described at Note 2.k.) of these debt instruments approximates the carrying value (as borrowings under these debt instruments are based on current variable market interest rates (plus a margin that is subject to change based on our consolidated leverage ratio)), as of both December 31, 2014 and March 31, 2015.
	-2	The fair values (Level 1 of fair value hierarchy described at Note 2.k.) of these debt instruments are based on quoted market prices for these notes on December 31, 2014 and March 31, 2015, respectively.
	-3	Collectively, the "Parent Notes." IMI is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior or senior subordinated basis, as the case may be, by most of its direct and indirect 100% owned United States subsidiaries (the "Guarantors"). These guarantees are joint and several obligations of the Guarantors. Canada Company, Iron Mountain Europe PLC ("IME"), the Special Purpose Subsidiaries (as defined below) and the remainder of our subsidiaries do not guarantee the Parent Notes.
	-4	Canada Company is the direct obligor on the CAD Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI and the Guarantors. These guarantees are joint and several obligations of IMI and the Guarantors. See Note 5 to Notes to Consolidated Financial Statements.
	-5	IME is the direct obligor on the GBP Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI and the Guarantors. These guarantees are joint and several obligations of IMI and the Guarantors. See Note 5 to Notes to Consolidated Financial Statements.
	-6	The Special Purpose Subsidiaries are the obligors under this program.
	-7	We believe the fair value (Level 3 of fair value hierarchy described at Note 2.k.) of this debt approximates its carrying
	value.
	On August 7, 2013, we amended our existing credit agreement. The revolving credit facilities (the "Revolving Credit Facility") under our credit agreement, as amended (the "Credit Agreement"), allow IMI and certain of its United States and foreign subsidiaries to borrow in United States dollars and (subject to sublimits) a variety of other currencies (including Canadian dollars, British pounds sterling, Euros, Brazilian reais and Australian dollars, among other currencies) in an aggregate outstanding amount not to exceed $1,500,000. Additionally, the Credit Agreement included an option to allow us to request additional commitments of up to $500,000, in the form of term loans or through increased commitments under the Revolving Credit Facility. On September 24, 2014, we exercised the option and borrowed an additional $250,000 in the form of a term loan under the Credit Agreement (the "Term Loan"). Commencing on December 31, 2014, the Term Loan began to amortize in quarterly installments in an amount equal to $625 per quarter, with the remaining balance due on June 27, 2016. The Term Loan may be prepaid without penalty or premium, in whole or in part, at any time. The Credit Agreement continues to include an option to allow us to request additional commitments of up to $250,000, in the form of term loans or through increased commitments under the Revolving Credit Facility.
	The Credit Agreement terminates on June 27, 2016, at which point all obligations become due. IMI and the Guarantors guarantee all obligations under the Credit Agreement, and have pledged the capital stock or other equity interests of most of their United States subsidiaries, up to 66% of the capital stock or other equity interests of their first-tier foreign subsidiaries, and all intercompany obligations (including promissory notes) owed to or held by them to secure the Credit Agreement. In addition, Canada Company has pledged 66% of the capital stock of its subsidiaries, and all intercompany obligations (including promissory notes) owed to or held by it to secure the Canadian dollar subfacility under the Revolving Credit Facility. The interest rate on borrowings under the Credit Agreement varies depending on our choice of interest rate and currency options, plus an applicable margin, which varies based on our consolidated leverage ratio. Additionally, the Credit Agreement requires the payment of a commitment fee on the unused portion of the Revolving Credit Facility, which fee ranges from between 0.3% to 0.5% based on certain financial ratios and fees associated with outstanding letters of credit. As of March 31, 2015, we had $823,881 and $248,750 of outstanding borrowings under the Revolving Credit Facility and the Term Loan, respectively. Of the $823,881 of outstanding borrowings under the Revolving Credit Facility, $632,250 was denominated in United States dollars, 81,200 was denominated in Canadian dollars, 67,750 was denominated in Euros and 71,600 was denominated in Australian dollars. In addition, we also had various outstanding letters of credit totaling $12,219. The remaining amount available for borrowing under the Revolving Credit Facility as of March 31, 2015, based on IMI's leverage ratio, the last 12 months' earnings before interest, taxes, depreciation and amortization and rent expense ("EBITDAR"), other adjustments as defined in the Credit Agreement and current external debt, was $663,900 (which amount represents the maximum availability as of such date). The average interest rate in effect under the Credit Agreement was 2.8% as of March 31, 2015. The average interest rate in effect under the Revolving Credit Facility was 2.9% and ranged from 2.3% to 5.1% as of March 31, 2015 and the interest rate in effect under the Term Loan as of March 31, 2015 was 2.4%.
	In March 2015, we entered into a $250,000 accounts receivable securitization program (the "Accounts Receivable Securitization Program") involving several of our wholly owned subsidiaries and certain financial institutions. Under the Accounts Receivable Securitization Program, certain of our subsidiaries sell substantially all of their United States accounts receivable balances to our wholly owned special purpose entities, Iron Mountain Receivables QRS, LLC and Iron Mountain Receivables TRS, LLC (the "Special Purpose Subsidiaries"). The Special Purpose Subsidiaries use the accounts receivable balances to collateralize loans obtained from certain financial institutions. Iron Mountain Information Management, LLC retains the responsibility of servicing the accounts receivable balances pledged as collateral in this transaction and IMI provides a performance guaranty. The Accounts Receivable Securitization Program terminates on March 6, 2018, at which point all obligations become due. The maximum availability allowed is limited by eligible accounts receivable, as defined under the terms of the Accounts Receivable Securitization Program.  As of March 31, 2015, the maximum availability allowed and amount outstanding under the Accounts Receivable Securitization Program was $220,800. The interest rate in effect under the Accounts Receivable Securitization Program was 1.1% as of March 31, 2015. Commitment fees at a rate of 40 basis points are charged on amounts made available but not borrowed under the Accounts Receivable Securitization Program.
	The Credit Agreement, our indentures and other agreements governing our indebtedness contain certain restrictive financial and operating covenants, including covenants that restrict our ability to complete acquisitions, pay cash dividends, incur indebtedness, make investments, sell assets and take certain other corporate actions. The covenants do not contain a rating trigger. Therefore, a change in our debt rating would not trigger a default under the Credit Agreement, our indentures or other agreements governing our indebtedness. The Credit Agreement uses EBITDAR-based calculations as the primary measures of financial performance, including leverage and fixed charge coverage ratios. IMI's Credit Agreement net total lease adjusted leverage ratio was 5.4 and 5.5 as of December 31, 2014 and March 31, 2015, respectively, compared to a maximum allowable ratio of 6.5, and its net secured debt lease adjusted leverage ratio was 2.6 and 2.7 as of December 31, 2014 and March 31, 2015, respectively, compared to a maximum allowable ratio of 4.0. IMI's bond leverage ratio (which is not lease adjusted), per the indentures, was 5.7 and 5.6 as of December 31, 2014 and March 31, 2015, respectively, compared to a maximum allowable ratio of 6.5. IMI's Credit Agreement fixed charge coverage ratio was 2.5 and 2.4 as of December 31, 2014 and March 31, 2015, respectively, compared to a minimum allowable ratio of 1.5 under the Credit Agreement. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity.
	For the three months ended March 31, 2014 and 2015, we recorded commitment fees and letters of credit fees of $658 and $867, respectively, based on the unused balances under the Revolving Credit Facility and the Accounts Receivable Securitization Program.

Selected_Consolidated_Financia

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors	3 Months Ended
	Mar. 31, 2015
Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors
Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors	Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors
	The following data summarizes the consolidating results of IMI on the equity method of accounting as of December 31, 2014 and March 31, 2015 and for the three months ended March 31, 2014 and 2015 and are prepared on the same basis as the consolidated financial statements.
	The Parent Notes, CAD Notes and GBP Notes are guaranteed by the subsidiaries referred to below as the Guarantors. These subsidiaries are 100% owned by IMI. The guarantees are full and unconditional, as well as joint and several.
	Additionally, IMI and the Guarantors guarantee the CAD Notes, which were issued by Canada Company, and the GBP Notes, which were issued by IME. Canada Company and IME do not guarantee the Parent Notes. The subsidiaries that do not guarantee the Parent Notes, the CAD Notes and the GBP Notes, including IME and the Special Purpose Subsidiaries but excluding Canada Company, are referred to below as the Non-Guarantors.
	In the normal course of business we periodically change the ownership structure of our subsidiaries to meet the requirements of our business. In the event of such changes, we recast the prior period financial information within this footnote to conform to the current period presentation in the period such changes occur. Generally, these changes do not alter the designation of the underlying subsidiaries as Guarantors or Non-Guarantors. However, they may change whether the underlying subsidiary is owned by the Parent, a Guarantor, Canada Company or a Non-Guarantor. If such a change occurs, the amount of investment in subsidiaries in the below consolidated balance sheets and equity in the earnings (losses) of subsidiaries, net of tax in the below consolidated statements of operations with respect to the relevant Parent, Guarantors, Canada Company, Non-Guarantors and Eliminations columns also would change.
	In March 2015, we entered into the Accounts Receivable Securitization Program, which is described more fully in Note 4. The Special Purpose Subsidiaries, which were established in conjunction with the Accounts Receivable Securitization Program, are included in the Non-Guarantors column in the below consolidated balance sheet, consolidated statement of operations and consolidated statement of cash flows from that date forward. As a result of the Accounts Receivable Securitization Program, certain of our Guarantors sold substantially all of their United States accounts receivable balances to the Special Purpose Subsidiaries. As of March 31, 2015, this resulted in a decrease in accounts receivable, an increase in intercompany receivable and a decrease in long-term debt related to our Guarantors and a corresponding increase in accounts receivable, an increase in intercompany payable and an increase in long-term debt related to our Non-Guarantors. There was no material impact to the Guarantors and Non-Guarantors columns of the below consolidated statement of operations for the three months ended March 31, 2015. Additionally, the Accounts Receivable Securitization Program resulted in increased financing cash flow activity for our Non-Guarantor subsidiaries for the three months ended March 31, 2015, as the proceeds from borrowings under the Accounts Receivable Securitization Program were used to repay intercompany loans with certain of our Guarantor subsidiaries, which resulted in increased cash flows from investing activities for our Guarantor subsidiaries for the three months ended March 31, 2015.
	CONSOLIDATED BALANCE SHEETS
		31-Dec-14
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Assets
	Current Assets:
	Cash and Cash Equivalents	$	2,399		$	4,713		$	4,979		$	113,842		$	—		$	125,933
	Restricted Cash	33,860			—			—			—			—			33,860
	Accounts Receivable	—			361,330			37,137			205,798			—			604,265
	Intercompany Receivable	—			586,725			—			—			(586,725		)	—
	Other Current Assets	153			88,709			2,925			61,908			(34		)	153,661
	Total Current Assets	36,412			1,041,477			45,041			381,548			(586,759		)	917,719
	Property, Plant and Equipment, Net	840			1,580,337			160,977			808,573			—			2,550,727
	Other Assets, Net:
	Long-term Notes Receivable from Affiliates and Intercompany Receivable	2,851,651			245			2,448			—			(2,854,344		)	—
	Investment in Subsidiaries	917,170			656,877			30,751			93,355			(1,698,153		)	—
	Goodwill	—			1,611,957			180,342			631,484			—			2,423,783
	Other	31,108			375,082			26,672			245,251			—			678,113
	Total Other Assets, Net	3,799,929			2,644,161			240,213			970,090			(4,552,497		)	3,101,896
	Total Assets	$	3,837,181		$	5,265,975		$	446,231		$	2,160,211		$	(5,139,256	)	$	6,570,342
	Liabilities and Equity
	Intercompany Payable	$	505,083		$	—		$	3,564		$	78,078		$	(586,725	)	$	—
	Current Portion of Long-term Debt	—			24,955			—			27,174			(34		)	52,095
	Total Other Current Liabilities	60,097			470,122			35,142			239,280			—			804,641
	Long-term Debt, Net of Current Portion	2,414,646			908,431			245,861			1,042,498			—			4,611,436
	Long-term Notes Payable to Affiliates and Intercompany Payable	1,000			2,851,384			—			1,960			(2,854,344		)	—
	Other Long-term Liabilities	—			115,789			37,558			78,868			—			232,215
	Commitments and Contingencies (See Note 7)
	Total Iron Mountain Incorporated Stockholders' Equity	856,355			895,294			124,106			678,753			(1,698,153		)	856,355
	Noncontrolling Interests	—			—			—			13,600			—			13,600
	Total Equity	856,355			895,294			124,106			692,353			(1,698,153		)	869,955
	Total Liabilities and Equity	$	3,837,181		$	5,265,975		$	446,231		$	2,160,211		$	(5,139,256	)	$	6,570,342
	CONSOLIDATED BALANCE SHEETS (Continued)
		31-Mar-15
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Assets
	Current Assets:
	Cash and Cash Equivalents	$	—		$	7,395		$	7,120		$	105,090		$	—		$	119,605
	Restricted Cash	20,000			—			—			—			—			20,000
	Accounts Receivable	—			14,842			33,975			541,209			—			590,026
	Intercompany Receivable	—			857,050			—			—			(857,050		)	—
	Other Current Assets	573			93,214			3,043			61,041			(29		)	157,842
	Total Current Assets	20,573			972,501			44,138			707,340			(857,079		)	887,473
	Property, Plant and Equipment, Net	795			1,580,203			147,886			747,918			—			2,476,802
	Other Assets, Net:
	Long-term Notes Receivable from Affiliates and Intercompany Receivable	2,919,207			1,000			2,234			—			(2,922,441		)	—
	Investment in Subsidiaries	867,150			607,661			28,066			91,633			(1,594,510		)	—
	Goodwill	—			1,612,151			165,582			580,828			—			2,358,561
	Other	30,145			375,615			24,370			218,488			—			648,618
	Total Other Assets, Net	3,816,502			2,596,427			220,252			890,949			(4,516,951		)	3,007,179
	Total Assets	$	3,837,870		$	5,149,131		$	412,276		$	2,346,207		$	(5,374,030	)	$	6,371,454
	Liabilities and Equity
	Intercompany Payable	$	658,287		$	—		$	3,292		$	195,471		$	(857,050	)	$	—
	Current Portion of Long-term Debt	—			23,254			—			31,258			(29		)	54,483
	Total Other Current Liabilities	55,930			394,054			26,613			189,251			—			665,848
	Long-term Debt, Net of Current Portion	2,379,798			846,299			227,442			1,213,820			—			4,667,359
	Long-term Notes Payable to Affiliates and Intercompany Payable	1,000			2,921,441			—			—			(2,922,441		)	—
Other Long-term Liabilities	—			118,005			35,230			74,027			—			227,262
Commitments and Contingencies (See Note 7)
Total Iron Mountain Incorporated Stockholders' Equity	742,855			846,078			119,699			628,733			(1,594,510		)	742,855
Noncontrolling Interests	—			—			—			13,647			—			13,647
Total Equity	742,855			846,078			119,699			642,380			(1,594,510		)	756,502
Total Liabilities and Equity	$	3,837,870		$	5,149,131		$	412,276		$	2,346,207		$	(5,374,030	)	$	6,371,454
CONSOLIDATED STATEMENTS OF OPERATIONS
	Three Months Ended March 31, 2014
	Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
							Company			Guarantors
Revenues:
Storage Rental	$	—		$	300,329		$	30,411		$	128,149		$	—		$	458,889
Service	—			186,430			16,150			108,657			—			311,237
Intercompany Service	—			—			—			17,358			(17,358		)	—
Total Revenues	—			486,759			46,561			254,164			(17,358		)	770,126
Operating Expenses:
Cost of Sales (Excluding Depreciation and Amortization)	—			202,920			6,242			125,983			—			335,145
Intercompany Service Cost of Sales	—			—			17,358			—			(17,358		)	—
Selling, General and Administrative	28			146,578			3,753			64,421			—			214,780
Depreciation and Amortization	77			52,640			2,999			30,717			—			86,433
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	—			929			1			222			—			1,152
Total Operating Expenses	105			403,067			30,353			221,343			(17,358		)	637,510
Operating (Loss) Income	(105		)	83,692			16,208			32,821			—			132,616
Interest Expense (Income), Net	48,165			(4,852		)	9,547			9,452			—			62,312
Other (Income) Expense, Net	(1,280		)	1,507			(20		)	5,110			—			5,317
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	(46,990		)	87,037			6,681			18,259			—			64,987
Provision (Benefit) for Income Taxes	—			23,803			2,538			3,393			—			29,734
(Gain) Loss on Sale of Real Estate, Net of Tax	—			(197		)	—			(7,271		)	—			(7,468		)
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(88,657		)	(24,826		)	(1,954		)	(4,143		)	119,580			—
Income (Loss) from Continuing Operations	41,667			88,257			6,097			26,280			(119,580		)	42,721
(Loss) Income from Discontinued Operations, Net of Tax	—			(625		)	—			13			—			(612		)
Net Income (Loss)	41,667			87,632			6,097			26,293			(119,580		)	42,109
Less: Net Income (Loss) Attributable to Noncontrolling Interest	—			—			—			442			—			442
Net Income (Loss) Attributable to Iron Mountain Incorporated	$	41,667		$	87,632		$	6,097		$	25,851		$	(119,580	)	$	41,667
Net Income (Loss)	$	41,667		$	87,632		$	6,097		$	26,293		$	(119,580	)	$	42,109
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	88			741			(2,618		)	3,577			—			1,788
Equity in Other Comprehensive Income (Loss) of Subsidiaries	1,589			(71		)	(1,160		)	(2,618		)	2,260			—
Total Other Comprehensive Income (Loss)	1,677			670			(3,778		)	959			2,260			1,788
Comprehensive Income (Loss)	43,344			88,302			2,319			27,252			(117,320		)	43,897
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	—			—			—			553			—			553
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$	43,344		$	88,302		$	2,319		$	26,699		$	(117,320	)	$	43,344
CONSOLIDATED STATEMENTS OF OPERATIONS (Continued)
	Three Months Ended March 31, 2015
	Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
							Company			Guarantors
Revenues:
Storage Rental	$	—		$	304,592		$	30,868		$	123,412		$	—		$	458,872
Service	—			180,865			16,557			92,992			—			290,414
Intercompany Service	—			352			—			16,419			(16,771		)	—
Total Revenues	—			485,809			47,425			232,823			(16,771		)	749,286
Operating Expenses:
Cost of Sales (Excluding Depreciation and Amortization)	—			196,661			7,165			117,828			—			321,654
Intercompany Service Cost of Sales	—			—			16,419			352			(16,771		)	—
Selling, General and Administrative	73			132,192			4,167			59,982			—			196,414
Depreciation and Amortization	46			55,403			3,052			27,450			—			85,951
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	—			322			—			11			—			333
Total Operating Expenses	119			384,578			30,803			205,623			(16,771		)	604,352
Operating (Loss) Income	(119		)	101,231			16,622			27,200			—			144,934
Interest Expense (Income), Net	39,170			(6,677		)	8,203			24,202			—			64,898
Other (Income) Expense, Net	(2,038		)	1,383			(127		)	23,131			—			22,349
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	(37,251		)	106,525			8,546			(20,133		)	—			57,687
Provision (Benefit) for Income Taxes	—			9,702			3,063			3,183			—			15,948
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(78,347		)	18,740			(1,059		)	(5,483		)	66,149			—
Net Income (Loss)	41,096			78,083			6,542			(17,833		)	(66,149		)	41,739
Less: Net Income (Loss) Attributable to Noncontrolling Interests	—			—			—			643			—			643
Net Income (Loss) Attributable to Iron Mountain Incorporated	$	41,096		$	78,083		$	6,542		$	(18,476	)	$	(66,149	)	$	41,096
Net Income (Loss)	$	41,096		$	78,083		$	6,542		$	(17,833	)	$	(66,149	)	$	41,739
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	4,930			—			(7,940		)	(53,165		)	—			(56,175		)
Market Value Adjustments for Securities	—			23			—			—			—			23
Equity in Other Comprehensive (Loss) Income of Subsidiaries	(60,981		)	(60,896		)	(3,007		)	(7,940		)	132,824			—
Total Other Comprehensive (Loss) Income	(56,051		)	(60,873		)	(10,947		)	(61,105		)	132,824			(56,152		)
Comprehensive (Loss) Income	(14,955		)	17,210			(4,405		)	(78,938		)	66,675			(14,413		)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	—			—			—			542			—			542
Comprehensive (Loss) Income Attributable to Iron Mountain Incorporated	$	(14,955	)	$	17,210		$	(4,405	)	$	(79,480	)	$	66,675		$	(14,955	)
CONSOLIDATED STATEMENTS OF CASH FLOWS
	Three Months Ended March 31, 2014
	Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
							Company			Guarantors
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	$	(68,972	)	$	79,555		$	10,421		$	34,637		$	—		$	55,641
Cash Flows from Investing Activities:
Capital expenditures	—			(71,520		)	(2,865		)	(33,471		)	—			(107,856		)
Cash paid for acquisitions, net of cash acquired	—			916			—			(31,697		)	—			(30,781		)
Intercompany loans to subsidiaries	377,202			61,895			—			—			(439,097		)	—
Investment in subsidiaries	(11,695		)	(11,695		)	—			—			23,390			—
Additions to customer relationship and acquisition costs	—			(7,341		)	(280		)	(537		)	—			(8,158		)
Proceeds from sales of property and equipment and other, net (including real estate)	—			1,441			64			16,387			—			17,892
Cash Flows from Investing Activities—Continuing Operations	365,507			(26,304		)	(3,081		)	(49,318		)	(415,707		)	(128,903		)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	—			(2,171,941		)	(252,107		)	(30,643		)	—			(2,454,691		)
Proceeds from revolving credit and term loan facilities and other debt	—			2,480,901			242,480			152,666			—			2,876,047
Early retirement of senior subordinated notes	(247,275		)	—			—			—			—			(247,275		)
Debt (repayment to) financing and equity contribution from (distribution to) noncontrolling interests, net	—			—			—			(2,317		)	—			(2,317		)
Intercompany loans from parent	—			(376,788		)	8,640			(70,949		)	439,097			—
Equity contribution from parent	—			11,695			—			11,695			(23,390		)	—
Parent cash dividends	(52,735		)	—			—			—			—			(52,735		)
Proceeds from exercise of stock options and employee stock purchase plan	2,417			—			—			—			—			2,417
Excess tax (deficiency) benefits from stock-based compensation	(185		)	—			—			—			—			(185		)
Payment of debt financing costs and stock issuance costs	—			—			(12		)	(410		)	—			(422		)
Cash Flows from Financing Activities—Continuing Operations	(297,778		)	(56,133		)	(999		)	60,042			415,707			120,839
Effect of exchange rates on cash and cash equivalents	—			—			136			1,667			—			1,803
(Decrease) Increase in cash and cash equivalents	(1,243		)	(2,882		)	6,477			47,028			—			49,380
Cash and cash equivalents, beginning of period	1,243			10,366			1,094			107,823			—			120,526
Cash and cash equivalents, end of period	$	—		$	7,484		$	7,571		$	154,851		$	—		$	169,906
CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)
	Three Months Ended March 31, 2015
	Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
							Company			Guarantors
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	$	(45,978	)	$	44,864		$	3,636		$	2,990		$	—		$	5,512
Cash Flows from Investing Activities:
Capital expenditures	—			(46,452		)	(3,774		)	(24,550		)	—			(74,776		)
Cash paid for acquisitions, net of cash acquired	—			(684		)	106			(5,853		)	—			(6,431		)
Intercompany loans to subsidiaries	132,692			79,946			—			—			(212,638		)	—
Investment in subsidiaries	(5,000		)	(5,000		)	—			—			10,000			—
Increase in restricted cash	13,860			—			—			—			—			13,860
Additions to customer relationship and acquisition costs	—			(7,990		)	(668		)	(585		)	—			(9,243		)
Proceeds from sales of property and equipment and other, net (including real estate)	—			160			6			244			—			410
Cash Flows from Investing Activities—Continuing Operations	141,552			19,980			(4,330		)	(30,744		)	(202,638		)	(76,180		)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	—			(1,894,836		)	(159,145		)	(228,280		)	—			(2,282,261		)
Proceeds from revolving credit and term loan facilities and other debt	—			1,823,900			161,962			464,541			—			2,450,403
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	—			—			—			(388		)	—			(388		)
Intercompany loans from parent	—			4,638			79			(217,355		)	212,638			—
Equity contribution from parent	—			5,000			—			5,000			(10,000		)	—
Parent cash dividends	(102,539		)	—			—			—			—			(102,539		)
Proceeds from exercise of stock options and employee stock purchase plan	4,364			—			—			—			—			4,364
Excess tax benefits (deficiency) from stock-based compensation	231			—			—			—			—			231
Payment of debt financing costs and stock issuance costs	(29		)	(864		)	—			(54		)	—			(947		)
Cash Flows from Financing Activities—Continuing Operations	(97,973		)	(62,162		)	2,896			23,464			202,638			68,863
Effect of exchange rates on cash and cash equivalents	—			—			(61		)	(4,462		)	—			(4,523		)
(Decrease) Increase in cash and cash equivalents	(2,399		)	2,682			2,141			(8,752		)	—			(6,328		)
Cash and cash equivalents, beginning of period	2,399			4,713			4,979			113,842			—			125,933
Cash and cash equivalents, end of period	$	—		$	7,395		$	7,120		$	105,090		$	—		$	119,605

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information
	As a result of a realignment in senior management reporting structure during the first quarter of 2015, we modified our internal financial reporting to better align internal reporting with how we manage our business. These modifications resulted in the separation of our former International Business segment into two unique reportable operating segments, which we refer to as (1) Western European Business segment and (2) Other International Business segment. Additionally, during the first quarter of 2015, we reassessed the nature of certain costs which were previously being allocated to the North American Records and Information Management Business and North American Data Management Business segments. As a result of this reassessment, we determined that certain product management functions, which were previously being performed to solely benefit our North American operating segments, are now being performed in a manner that benefits the enterprise as a whole. Accordingly, the costs associated with these product management functions are now included within the Corporate and Other Business segment. Previously reported segment information has been restated to conform to the current period presentation.
	Our five reportable operating segments are described as follows:
	•	North American Records and Information Management Business—storage and information management services throughout the United States and Canada, including the storage of paper documents, as well as other media such as microfilm and microfiche, master audio and videotapes, film, X‑rays and blueprints, including healthcare information services, vital records services, service and courier operations, and the collection, handling and disposal of sensitive documents for corporate customers (“Records Management”); information destruction services (“Destruction”); DMS; Fulfillment Services; and Intellectual Property Management.
	•	North American Data Management Business—storage and rotation of backup computer media as part of corporate disaster recovery plans throughout the United States and Canada, including service and courier operations (“Data Protection & Recovery”); server and computer backup services; digital content repository systems to house, distribute, and archive key media assets; and storage, safeguarding and electronic or physical delivery of physical media of all types, primarily for entertainment and media industry clients.
	•	Western European Business—Records Management, Data Protection & Recovery and DMS throughout the United Kingdom, Ireland, Norway, Austria, Belgium, France, Germany, Netherlands, Spain and Switzerland. Until December 2014, our Western European Business segment offered Destruction in the United Kingdom and Ireland.
	•	Other International Business—storage and information management services throughout the remaining European countries in which we operate, Latin America and Asia Pacific, including Records Management, Data Protection & Recovery and DMS. Our European operations included within the Other International Business segment provide Records Management, Data Protection & Recovery and DMS. Our Latin America operations provide Records Management, Data Protection & Recovery, Destruction and DMS throughout Argentina, Brazil, Chile, Colombia, Mexico and Peru. Our Asia Pacific operations provide Records Management, Data Protection & Recovery and DMS throughout Australia, with Records Management and Data Protection & Recovery also provided in certain cities in India, Singapore, Hong Kong‑SAR and China. Until December 2014, our Other International Business segment offered Destruction in Australia.
	•	Corporate and Other Business—consists of our data center business in the United States, the primary product offering of our Emerging Businesses segment, as well as costs related to executive and staff functions, including finance, human resources and information technology, which benefit the enterprise as a whole. These costs are primarily related to the general management of these functions on a corporate level and the design and development of programs, policies and procedures that are then implemented in the individual segments, with each segment bearing its own cost of implementation. Our Corporate and Other Business segment also includes stock‑based employee compensation expense associated with all Employee Stock‑Based Awards.
	An analysis of our business segment information and reconciliation to the accompanying Consolidated Financial Statements is as follows:
			North American				North American			Western European Business		Other International Business		Corporate			Total
			Records and				Data							and Other			Consolidated
			Information				Management							Business
			Management				Business
			Business
	Three Months Ended March 31, 2014
	Total Revenues		$	446,132			$	96,724		$	117,131	$	107,299	$	2,840		$	770,126
	Depreciation and Amortization		45,506				5,030			14,340		14,419		7,138			86,433
	Depreciation		40,821				4,965			12,014		9,775		7,138			74,713
	Amortization		4,685				65			2,326		4,644		—			11,720
	Adjusted OIBDA		169,209				54,668			34,563		24,200		(54,116		)	228,524
	Total Assets (1)		3,632,489				666,188			1,131,454		994,657		281,829			6,706,617
	Expenditures for Segment Assets		49,266				5,507			10,787		54,154		27,081			146,795
	Capital Expenditures		42,561				5,507			9,974		22,733		27,081			107,856
	Cash Paid for Acquisitions, Net of Cash Acquired		(916		)		—			296		31,401		—			30,781
	Additions to Customer Relationship and Acquisition Costs		7,621				—			517		20		—			8,158
	Three Months Ended March 31, 2015
	Total Revenues		442,687				97,235			100,812		103,991		4,561			749,286
	Depreciation and Amortization		45,303				5,344			11,439		14,265		9,600			85,951
	Depreciation		40,336				5,284			9,986		9,632		9,553			74,791
	Amortization		4,967				60			1,453		4,633		47			11,160
	Adjusted OIBDA		181,480				51,288			29,453		20,835		(51,838		)	231,218
	Total Assets (1)		3,623,905				648,507			896,380		911,481		291,181			6,371,454
	Expenditures for Segment Assets		42,375				4,949			7,588		22,548		12,990			90,450
	Capital Expenditures		33,180				4,907			4,410		19,289		12,990			74,776
	Cash Paid for Acquisitions, Net of Cash Acquired		600				(21		)	2,819		3,033		—			6,431
	Additions to Customer Relationship and Acquisition Costs		8,595				63			359		226		—			9,243
	_______________________________________________________________________________
	-1	Excludes all intercompany receivables or payables and investment in subsidiary balances.
	The accounting policies of the reportable segments are the same as those described in Note 2. Adjusted OIBDA for each segment is defined as operating income before depreciation, amortization, intangible impairments, (gain) loss on disposal/write-down of property, plant and equipment, net (excluding real estate) and REIT Costs (defined below) directly attributable to the segment. Internally, we use Adjusted OIBDA as the basis for evaluating the performance of, and allocating resources to, our operating segments.
	A reconciliation of Adjusted OIBDA to income (loss) from continuing operations before provision (benefit) for income taxes and (gain) loss on sale of real estate on a consolidated basis is as follows:
		Three Months Ended
		March 31,
		2014				2015
	Adjusted OIBDA	$	228,524			$	231,218
	Less: Depreciation and Amortization	86,433				85,951
	Loss on Disposal/Write-Down of Property, Plant and Equipment (Excluding Real Estate), Net	1,152				333
	REIT Costs(1)	8,323				—
	Interest Expense, Net	62,312				64,898
	Other Expense, Net	5,317				22,349
	Income from Continuing Operations before Provision for Income Taxes and Gain on Sale of Real Estate	$	64,987			$	57,687
	_______________________________________________________________________________
	-1	Includes costs associated with our conversion to a REIT, excluding REIT compliance costs beginning January 1, 2014 which we expect to recur in future periods ("REIT Costs").

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	a.    Litigation—General
	We are involved in litigation from time to time in the ordinary course of business. A portion of the defense and/or settlement costs associated with such litigation is covered by various commercial liability insurance policies purchased by us and, in limited cases, indemnification from third parties. Our policy is to establish reserves for loss contingencies when the losses are both probable and reasonably estimable. We record legal costs associated with loss contingencies as expenses in the period in which they are incurred. The matters described below represent our significant loss contingencies. We have evaluated each matter and, if both probable and estimable, accrued an amount that represents our estimate of any probable loss associated with such matter. In addition, we have estimated a reasonably possible range for all loss contingencies including those described below. We believe it is reasonably possible that we could incur aggregate losses in addition to amounts currently accrued for all matters up to an additional $4,000 over the next several years, of which certain amounts would be covered by insurance or indemnity arrangements.
	b.    Italy Fire
	On November 4, 2011, we experienced a fire at a facility we leased in Aprilia, Italy. The facility primarily stored archival and inactive business records for local area businesses. Despite quick response by local fire authorities, damage to the building was extensive, and the building and its contents were a total loss. Although our warehouse legal liability insurer has reserved its rights to contest coverage related to certain types of potential claims, we believe we carry adequate insurance. We have been sued by four customers, of which three of those matters have been settled. We have also received correspondence from other customers, under various theories of liabilities. We deny any liability with respect to the fire and we have referred these claims to our warehouse legal liability insurer for an appropriate response. We do not expect that this event will have a material impact on our consolidated financial condition, results of operations or cash flows. We sold our Italian operations on April 27, 2012, and we indemnified the buyers related to certain obligations and contingencies associated with the fire.
	Our policy related to business interruption insurance recoveries is to record gains within other (income) expense, net in our Consolidated Statements of Operations and proceeds received within cash flows from operating activities in our Consolidated Statements of Cash Flows. Such amounts are recorded in the period the cash is received. Our policy with respect to involuntary conversion of property, plant and equipment is to record any gain or loss within (gain) loss on disposal/write-down of property, plant and equipment (excluding real estate), net within operating income in our Consolidated Statements of Operations and proceeds received within cash flows from investing activities within our Consolidated Statements of Cash Flows. Losses are recorded when incurred and gains are recorded in the period when the cash received exceeds the carrying value of the related property, plant and equipment. As a result of the sale of the Italian operations, statements of operation and cash flow impacts related to the fire will be reflected as discontinued operations.
	c.    Argentina Fire
	On February 5, 2014, we experienced a fire at a facility we own in Buenos Aires, Argentina. As a result of the quick response by local fire authorities, the fire was contained before the entire facility was destroyed and all employees were safely evacuated; however, a number of first responders lost their lives, or in some cases, were severely injured. The cause of the fire is currently being investigated. We believe we carry adequate insurance and do not expect that this event will have a material impact to our consolidated financial condition, results of operations or cash flows. Revenues from our operations at this facility represent less than 0.5% of our consolidated revenues.

Stockholders_Equity_Matters

Stockholders' Equity Matters	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Stockholders' Equity Matters	Stockholders' Equity Matters
	On September 15, 2014, we announced the declaration by our board of directors of a special distribution of $700,000 (the "Special Distribution"), payable to stockholders of record as of September 30, 2014 (the "Record Date"). The Special Distribution represented the remaining amount of our undistributed earnings and profits attributable to all taxable periods ending on or prior to December 31, 2013, which in accordance with tax rules applicable to REIT conversions, we were required to pay to our stockholders on or before December 31, 2014 in connection with our conversion to a REIT. The Special Distribution also included certain items of taxable income that we recognized in 2014, such as depreciation recapture in respect of accounting method changes commenced in our pre-REIT period as well as foreign earnings and profits recognized as dividend income. The Special Distribution followed an initial special distribution of $700,000 paid to stockholders in November 2012.
	The Special Distribution was paid on November 4, 2014 (the "Payment Date") to stockholders of record as of the Record Date in a combination of common stock and cash. Stockholders had the right to elect to be paid their pro rata portion of the Special Distribution in all common stock or all cash, with the total cash payment to stockholders limited to no more than $140,000, or 20% of the total Special Distribution, not including cash paid in lieu of fractional shares. Based on stockholder elections, we paid $140,000 of the Special Distribution in cash, not including cash paid in lieu of fractional shares, with the balance paid in the form of common stock. Our shares of common stock were valued for purposes of the Special Distribution based upon the average closing price on the three trading days following October 24, 2014, or $35.55 per share, and as such, we issued approximately 15,750,000 shares of common stock in the Special Distribution. These shares impact weighted average shares outstanding from the date of issuance, and thus will impact our earnings per share data prospectively from the Payment Date.
	In February 2010, our board of directors adopted a dividend policy under which we have paid, and in the future intend to pay, quarterly cash dividends on our common stock. Declaration and payment of future quarterly dividends is at the discretion of our board of directors.
	In November 2014, our board of directors declared a distribution of $0.255 per share (the “Catch‑Up Distribution”) payable on December 15, 2014 to stockholders of record on November 28, 2014. Our board of directors declared the Catch‑Up Distribution because our cash distributions paid from January 2014 through July 2014 were declared and paid before our board of directors had determined that we would elect REIT status effective January 1, 2014 and were lower than they otherwise would have been if the final determination to elect REIT status effective January 1, 2014 had been prior to such distributions.
	In fiscal year 2014 and in the first quarter of 2015, our board of directors declared the following dividends:
	Declaration Date	Dividend		Record Date	Total		Payment Date
		Per Share			Amount
	14-Mar-14	$	0.27	March 25, 2014	$	51,812	April 15, 2014
	28-May-14	0.27		June 25, 2014	52,033		July 15, 2014
	15-Sep-14	0.475		September 25, 2014	91,993		October 15, 2014
	September 15, 2014 (1)	3.6144		30-Sep-14	700,000		4-Nov-14
	November 17, 2014 (2)	0.255		28-Nov-14	53,450		15-Dec-14
	17-Nov-14	0.475		5-Dec-14	99,617		22-Dec-14
	19-Feb-15	0.475		6-Mar-15	99,795		20-Mar-15
	_______________________________________________________________________________
	(1) Represents Special Distribution.
	(2) Represents Catch-Up Distribution.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event
	On April 28, 2015, we reached an agreement in principle with Recall Holdings Limited (“Recall”) to acquire Recall by way of a recommended court approved Scheme of Arrangement for 0.1722 of a share of our common stock for each outstanding share of Recall common stock. In addition, Recall shareholders will be offered the option to elect to receive alternative consideration of 8.50 Australian dollars per Recall share in cash, subject to a proration mechanism that will cap the total amount of cash consideration to be paid to Recall shareholders at 225,000 Australian dollars. The proposed transaction is contingent on our and Recall conducting confirmatory due diligence and negotiating and executing mutually acceptable merger documentation, including entering into a Scheme Implementation Agreement, and other terms and conditions. The agreement in principle does not assure that a definitive agreement regarding the proposed transaction will be reached or that any transaction between us and Recall will actually occur. Conditions precedent to the closing of the proposed transaction will include, among other things, receipt of antitrust/competition and other requisite regulatory approvals, no material adverse event affecting either party, Recall shareholder approval, our shareholder approval, Australian Court approvals and other customary conditions for a transaction of this nature.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash, Cash Equivalents and Restricted Cash
	Cash and cash equivalents include cash on hand and cash invested in highly liquid short-term securities, which have remaining maturities at the date of purchase of less than 90 days. Cash and cash equivalents are carried at cost, which approximates fair value.
	We have restricted cash associated with a collateral trust agreement with our insurance carrier related to our workers' compensation self-insurance program.
Foreign Currency Transactions and Translations	Foreign Currency
	Local currencies are the functional currencies for our operations outside the United States, with the exception of certain foreign holding companies and our financing centers in Switzerland, whose functional currency is the United States dollar. In those instances where the local currency is the functional currency, assets and liabilities are translated at period-end exchange rates, and revenues and expenses are translated at average exchange rates for the applicable period. Resulting translation adjustments are reflected in the accumulated other comprehensive items, net component of Iron Mountain Incorporated Stockholders' Equity and Noncontrolling Interests in the accompanying Consolidated Balance Sheets. The gain or loss on foreign currency transactions, calculated as the difference between the historical exchange rate and the exchange rate at the applicable measurement date, including those related to (1) our previously outstanding 71/4% GBP Senior Subordinated Notes due 2014 (the "71/4% Notes"), (2) our 63/4% Euro Senior Subordinated Notes due 2018 (the "63/4% Notes"), (3) borrowings in certain foreign currencies under our revolving credit facility and (4) certain foreign currency denominated intercompany obligations of our foreign subsidiaries to us and between our foreign subsidiaries, which are not considered permanently invested, are included in other expense (income), net, in the accompanying Consolidated Statements of Operations.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	Goodwill and intangible assets with indefinite lives are not amortized but are reviewed annually for impairment or more frequently if impairment indicators arise. Other than goodwill, we currently have no intangible assets that have indefinite lives and which are not amortized. Separable intangible assets that are not deemed to have indefinite lives are amortized over their useful lives. We annually, or more frequently if events or circumstances warrant, assess whether a change in the lives over which our intangible assets are amortized is necessary.
	We have selected October 1 as our annual goodwill impairment review date. We performed our most recent annual goodwill impairment review as of October 1, 2014 and concluded there was no impairment of goodwill at such date. As of December 31, 2014 and March 31, 2015, no factors were identified that would alter our October 1, 2014 goodwill assessment. In making this assessment, we relied on a number of factors including operating results, business plans, anticipated future cash flows, transactions and marketplace data. There are inherent uncertainties related to these factors and our judgment in applying them to the analysis of goodwill impairment. When changes occur in the composition of one or more reporting units, the goodwill is reassigned to the reporting units affected based on their relative fair values.
	Our reporting units at which level we performed our goodwill impairment analysis as of October 1, 2014 were as follows: (1) North American Records and Information Management; (2) technology escrow services that protect and manage source code (“Intellectual Property Management”); (3) the storage, assembly and detailed reporting of customer marketing literature and delivery to sales offices, trade shows and prospective customers’ sites based on current and prospective customer orders (“Fulfillment Services”); (4) North American Data Management; (5) Emerging Businesses (which primarily relates to our data center business in the United States and which is a component of our Corporate and Other Business segment); (6) the United Kingdom, Ireland, Norway, Austria, Belgium, France, Germany, Netherlands, Spain and Switzerland (“New Western Europe”); (7) the remaining countries in Europe in which we operate, excluding Russia, Ukraine and Denmark (“Emerging Markets - Eastern Europe” (formerly referred to as the "New Emerging Markets" reporting unit)); (8) Latin America; (9) Australia and Singapore; (10) China and Hong Kong (“Greater China”); (11) India; and (12) Russia, Ukraine and Denmark.
Stock-Based Compensation	Stock-Based Compensation
	We record stock-based compensation expense, utilizing the straight-line method, for the cost of stock options, restricted stock, restricted stock units ("RSUs"), performance units ("PUs") and shares of stock issued under our employee stock purchase plan ("ESPP") (together, "Employee Stock-Based Awards").
	Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations for the three months ended March 31, 2014 and 2015 was $7,141 ($5,134 after tax or $0.03 per basic and diluted share) and $6,856 ($4,946 after tax or $0.02 per basic and diluted share), respectively.
	Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations related to continuing operations is as follows:
		Three Months
		Ended
		March 31,
		2014				2015
	Cost of sales (excluding depreciation and amortization)	$	190			$	45
	Selling, general and administrative expenses	6,951				6,811
	Total stock-based compensation	$	7,141			$	6,856
	The benefits associated with the tax deductions in excess of recognized compensation cost are required to be reported as financing activities in the accompanying Consolidated Statements of Cash Flows. This requirement reduces reported operating cash flows and increases reported financing cash flows. As a result, net financing cash flows from continuing operations included $(185) and $231 for the three months ended March 31, 2014 and 2015, respectively, from the (deficiency) benefit of tax deductions compared to recognized compensation cost. The tax benefit of any resulting excess tax deduction increases the Additional Paid-in Capital ("APIC") pool. Any resulting tax deficiency is deducted from the APIC pool.
	Stock Options
	Under our various stock option plans, options are generally granted with exercise prices equal to the market price of the stock on the date of grant; however, in certain limited instances, options are granted at prices greater than the market price of the stock on the date of grant. Certain of the options we issue become exercisable ratably over a period of ten years from the date of grant and have a contractual life of 12 years from the date of grant, unless the holder's employment is terminated sooner. As of March 31, 2015, ten-year vesting options represented 7.2% of total outstanding options. Certain of the options we issue become exercisable ratably over a period of three years from the date of grant and have a contractual life of ten years from the date of grant, unless the holder's employment is terminated sooner. As of March 31, 2015, three-year vesting options represented 45.7% of total outstanding options. Our non-employee directors are considered employees for purposes of our stock option plans and stock option reporting. Options granted to our non-employee directors generally become exercisable one year from the date of grant. The remainder of our options became exercisable ratably over a period of five years from date of grant and generally have a contractual life of ten years from the date of grant, unless the holder's employment is terminated sooner.
	The weighted average fair value of options granted for the three months ended March 31, 2014 and 2015 was $5.60 and $4.99 per share, respectively. These values were estimated on the date of grant using the Black-Scholes option pricing model. The following table summarizes the weighted average assumptions used for grants in the respective period:
			Three Months Ended
			March 31,
	Weighted Average Assumptions		2014			2015
	Expected volatility		33.9	%		28.6	%
	Risk-free interest rate		2.06	%		1.71	%
	Expected dividend yield		4	%		5	%
	Expected life		6.8 years			5.5 years
	Expected volatility is calculated utilizing daily historical volatility over a period that equates to the expected life of the option. The risk-free interest rate was based on the United States Treasury interest rates whose term is consistent with the expected life of the stock options. Expected dividend yield is considered in the option pricing model and represents our current annualized expected per share dividends over the current trade price of our common stock. The expected life (estimated period of time outstanding) of the stock options granted is estimated using the historical exercise behavior of employees.
	A summary of option activity for the three months ended March 31, 2015 is as follows:
		Options			Weighted				Weighted	Average
					Average				Average	Intrinsic
					Exercise				Remaining	Value
					Price				Contractual
									Term (Years)
	Outstanding at December 31, 2014	3,678,246			$	23.37
	Granted	674,620			43.86
	Exercised	(233,791	)		20.93
	Forfeited	(19,119	)		23.97
	Expired	(11,045	)		22.15
	Outstanding at March 31, 2015	4,088,911			$	26.89			5.86	$	44,191
	Options exercisable at March 31, 2015	2,725,000			$	22.74			4.42	$	37,445
	Options expected to vest	1,265,183			$	34.97			8.71	$	6,435
	The following table provides the aggregate intrinsic value of stock options exercised for the three months ended March 31, 2014 and 2015:
		Three Months Ended
		March 31,
		2014				2015
	Aggregate intrinsic value of stock options exercised	$	977			$	4,167
	Restricted Stock and Restricted Stock Units
	Under our various equity compensation plans, we may also grant restricted stock or RSUs. Our restricted stock and RSUs generally have a vesting period of between three and five years from the date of grant. All RSUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of RSUs in cash upon the vesting date of the associated RSU and will be forfeited if the RSU does not vest. We accrued approximately $434 and $670 of cash dividends on RSUs for the three months ended March 31, 2014 and 2015, respectively. We paid approximately $831 and $1,729 of cash dividends on RSUs for the three months ended March 31, 2014 and 2015, respectively. The fair value of restricted stock and RSUs is the excess of the market price of our common stock at the date of grant over the purchase price (which is typically zero).
	A summary of restricted stock and RSU activity for the three months ended March 31, 2015 is as follows:
		Restricted			Weighted-
		Stock and RSUs			Average
					Grant-Date
					Fair Value
	Non-vested at December 31, 2014	1,405,569			$	28.78
	Granted	462,323			38.82
	Vested	(426,901	)		30.49
	Forfeited	(29,265	)		30.43
	Non-vested at March 31, 2015	1,411,726			$	31.52
	No restricted stock vested during each of the three months ended March 31, 2014 and 2015. The total fair value of RSUs vested during the three months ended March 31, 2014 and 2015 was $13,844 and $15,584, respectively.
	Performance Units
	Under our various equity compensation plans, we may also make awards of PUs. For the majority of PUs, the number of PUs earned is determined based on our performance against predefined targets of revenue or revenue growth and return on invested capital ("ROIC"). The number of PUs earned may range from 0% to 150% (for PUs granted prior to 2014) and 0% to 200% (for PUs granted in 2014 and 2015) of the initial award. The number of PUs earned is determined based on our actual performance as compared to the targets at the end of either the one-year performance period (for PUs granted prior to 2014) or the three-year performance period (for PUs granted in 2014 and 2015). Certain PUs granted in 2013, 2014 and 2015 will be earned based on a market condition associated with the total return on our common stock in relation to a subset of the S&P 500 rather than the revenue growth and ROIC targets noted above. The number of PUs earned based on this market condition may range from 0% to 200% of the initial award. All of our PUs will be settled in shares of our common stock and are subject to cliff vesting three years from the date of the original PU grant. For those PUs subject to a one-year performance period, employees who subsequently terminate their employment after the end of the one-year performance period and on or after attaining age 55 and completing 10 years of qualifying service (the "Retirement Criteria") shall immediately and completely vest in any PUs earned based on the actual achievement against the predefined targets as discussed above (but delivery of the shares remains deferred). As a result, PUs subject to a one-year performance period are generally expensed over the shorter of (1) the vesting period, (2) achievement of the Retirement Criteria, which may occur as early as January 1 of the year following the year of grant or (3) a maximum of three years. For those PUs subject to a three-year performance period, employees who terminate their employment during the performance period and on or after meeting the Retirement Criteria are eligible for pro rated vesting, subject to the actual achievement against the predefined targets as discussed above, based on the number of full years of service completed following the grant date (but delivery of the shares remains deferred). As a result, PUs subject to a three-year performance period are generally expensed over the three-year performance period. Outstanding PUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of PUs in cash upon the settlement date of the associated PU and will be forfeited if the PU does not vest. We accrued approximately $150 and $211 of cash dividends on PUs for the three months ended March 31, 2014 and 2015, respectively. We paid approximately $221 and $1,015 of cash dividends on PUs for the three months ended March 31, 2014 and 2015, respectively.
	During the three months ended March 31, 2015, we issued 131,996 PUs. Our PUs are earned based on our performance against revenue or revenue growth and ROIC targets during their applicable performance period; therefore, we forecast the likelihood of achieving the predefined revenue, revenue growth and ROIC targets in order to calculate the expected PUs to be earned. We record a compensation charge based on either the forecasted PUs to be earned (during the applicable performance period) or the actual PUs earned (at the one-year anniversary date for PUs granted prior to 2014, and at the three-year anniversary date for PUs granted in 2014 and 2015) over the vesting period for each of the awards. For PUs earned based on a market condition, we utilized a Monte Carlo simulation to fair value these awards at the date of grant, and such fair value is expensed over the three-year performance period. The total fair value of earned PUs that vested during the three months ended March 31, 2014 and 2015 was $4,030 and $2,063, respectively. As of March 31, 2015, we expected 60% and 100% achievement of the predefined revenue, revenue growth and ROIC targets associated with the awards of PUs made in 2014 and 2015, respectively.
	A summary of PU activity for the three months ended March 31, 2015 is as follows:
		Original			PU Adjustment(1)			Total		Weighted-
		PU Awards						PU Awards		Average
										Grant-Date
										Fair Value
	Non-vested at December 31, 2014	461,666			(82,609	)		379,057		$	30.8
Granted	131,996			—			131,996		40.58
Vested	(78,311	)		(4,769	)		(83,080	)	29.47
Forfeited	(19,038	)		—			(19,038	)	30.96
Non-vested at March 31, 2015	496,313			(87,378	)		408,935		$	34.22
_______________________________________________________________________________
-1	Represents an increase or decrease in the number of original PUs awarded based on either (a) the final performance criteria achievement at the end of the defined performance period of such PUs or (b) a change in estimated awards based on the forecasted performance against the predefined targets.
Employee Stock Purchase Plan
We offer an ESPP in which participation is available to substantially all United States and Canadian employees who meet certain service eligibility requirements. The ESPP provides a way for our eligible employees to become stockholders on favorable terms. The ESPP provides for the purchase of our common stock by eligible employees through successive offering periods. We have historically had two six-month offering periods per year, the first of which generally runs from June 1 through November 30 and the second of which generally runs from December 1 through May 31. During each offering period, participating employees accumulate after-tax payroll contributions, up to a maximum of 15% of their compensation, to pay the purchase price at the end of the offering. Participating employees may withdraw from an offering before the purchase date and obtain a refund of the amounts withheld as payroll deductions. At the end of the offering period, outstanding options under the ESPP are exercised, and each employee's accumulated contributions are used to purchase our common stock. The price for shares purchased under the ESPP is 95% of the fair market price at the end of the offering period, without a look-back feature. As a result, we do not recognize compensation expense for the ESPP shares purchased. In the three months ended March 31, 2014 and 2015, there were no offering periods which ended under the ESPP, and no shares were issued. As of March 31, 2015, we have 960,638 shares available under the ESPP.
_______________________________________________________________________________
As of March 31, 2015, unrecognized compensation cost related to the unvested portion of our Employee Stock-Based Awards was $53,880 and is expected to be recognized over a weighted-average period of 2.3 years.
We generally issue shares of our common stock for the exercises of stock options, restricted stock, RSUs, PUs and shares of our common stock under our ESPP from unissued reserved shares.
Income (Loss) Per Share-Basic and Diluted	Income (Loss) Per Share—Basic and Diluted
	Basic income (loss) per common share is calculated by dividing income (loss) by the weighted average number of common shares outstanding. The calculation of diluted income (loss) per share is consistent with that of basic income (loss) per share but gives effect to all potential common shares (that is, securities such as options, warrants or convertible securities) that were outstanding during the period, unless the effect is antidilutive.
	The following table presents the calculation of basic and diluted income (loss) per share:
		Three Months Ended
		March 31,
		2014				2015
	Income (loss) from continuing operations	$	42,721			$	41,739
	Total (loss) income from discontinued operations	$	(612	)		$	—
	Net income (loss) attributable to Iron Mountain Incorporated	$	41,667			$	41,096
	Weighted-average shares—basic	191,879,000				210,237,000
	Effect of dilutive potential stock options	682,801				1,223,330
	Effect of dilutive potential restricted stock, RSUs and PUs	507,219				788,758
	Weighted-average shares—diluted	193,069,020				212,249,088
	Earnings (losses) per share—basic:
	Income (loss) from continuing operations	$	0.22			$	0.2
	Total (loss) income from discontinued operations	$	—			$	—
	Net income (loss) attributable to Iron Mountain Incorporated—basic	$	0.22			$	0.2
	Earnings (losses) per share—diluted:
	Income (loss) from continuing operations	$	0.22			$	0.2
	Total (loss) income from discontinued operations	$	—			$	—
	Net income (loss) attributable to Iron Mountain Incorporated—diluted	$	0.22			$	0.19
	Antidilutive stock options, RSUs and PUs, excluded from the calculation	1,380,962				358,233
Revenues	Revenues
	Our revenues consist of storage rental revenues as well as service revenues and are reflected net of sales and value added taxes. Storage rental revenues, which are considered a key driver of financial performance for the storage and information management services industry, consist primarily of recurring periodic rental charges related to the storage of materials or data (generally on a per unit basis). Service revenues include charges for related service activities, which include: (1) the handling of records, including the addition of new records, temporary removal of records from storage, refiling of removed records and the destruction of records; (2) courier operations, consisting primarily of the pickup and delivery of records upon customer request; (3) secure shredding of sensitive documents and the related sale of recycled paper, the price of which can fluctuate from period to period; (4) other services, including the scanning, imaging and document conversion services of active and inactive records, or Document Management Solutions ("DMS"), which relate to physical and digital records, and project revenues; (5) customer termination and permanent withdrawal fees; (6) data restoration projects; (7) special project work; (8) Fulfillment Services; (9) consulting services; and (10) Intellectual Property Management and other technology services and product sales (including specially designed storage containers and related supplies).
	We recognize revenue when the following criteria are met: persuasive evidence of an arrangement exists, services have been rendered, the sales price is fixed or determinable and collectability of the resulting receivable is reasonably assured. Storage rental and service revenues are recognized in the month the respective storage rental or service is provided, and customers are generally billed on a monthly basis on contractually agreed-upon terms. Amounts related to future storage rental or prepaid service contracts for customers where storage rental fees or services are billed in advance are accounted for as deferred revenue and recognized ratably over the period the applicable storage rental or service is provided or performed. Revenues from the sales of products, which are included as a component of service revenues, are recognized when products are shipped and title has passed to the customer. Revenues from the sales of products have historically not been significant.
Allowance for Doubtful Accounts and Credit Memo Reserves	Allowance for Doubtful Accounts and Credit Memo Reserves
	We maintain an allowance for doubtful accounts and credit memos for estimated losses resulting from the potential inability of our customers to make required payments and potential disputes regarding billing and service issues. When calculating the allowance, we consider our past loss experience, current and prior trends in our aged receivables and credit memo activity, current economic conditions and specific circumstances of individual receivable balances. If the financial condition of our customers were to significantly change, resulting in a significant improvement or impairment of their ability to make payments, an adjustment of the allowance may be required. We charge-off uncollectible balances as circumstances warrant, generally, no later than one year past due.
Income Taxes	Income Taxes
	As noted previously, we have been organized and operating as a REIT for federal income tax purposes effective for our taxable year beginning January 1, 2014. As a REIT, we are generally permitted to deduct from our federal taxable income the dividends we pay to our stockholders. The income represented by such dividends is not subject to federal taxation at the entity level but is taxed, if at all, at the stockholder level. The income of our domestic taxable REIT subsidiaries (“TRSs”), which hold our domestic operations that may not be REIT‑compliant as currently operated and structured, is subject, as applicable, to federal and state corporate income tax. In addition, we and our subsidiaries continue to be subject to foreign income taxes in jurisdictions in which they hold assets or conduct operations, regardless of whether held or conducted through subsidiaries disregarded for federal tax purposes or TRSs. We will also be subject to a separate corporate income tax on any gains recognized during a specified period (generally ten years) following the REIT conversion that are attributable to “built‑in” gains with respect to the assets that we owned on January 1, 2014; this built‑in gains tax will also be imposed on our depreciation recapture recognized into income in 2014 and subsequent taxable years as a result of accounting method changes commenced in our pre‑REIT period. If we fail to remain qualified for taxation as a REIT, we will be subject to federal income tax at regular corporate tax rates. Even if we remain qualified for taxation as a REIT, we may be subject to some federal, state, local and foreign taxes on our income and property in addition to taxes owed with respect to our TRS operations. In particular, while state income tax regimes often parallel the federal income tax regime for REITs, many states do not completely follow federal rules and some do not follow them at all.
	We provide for income taxes during interim periods based on our estimate of the effective tax rate for the year. Discrete items and changes in our estimate of the annual effective tax rate are recorded in the period they occur. Our effective tax rate is subject to variability in the future due to, among other items: (1) changes in the mix of income between our qualified REIT subsidiaries and our TRSs; (2) tax law changes; (3) volatility in foreign exchange gains (losses); (4) the timing of the establishment and reversal of tax reserves; and (5) our ability to utilize net operating losses that we generate. We are subject to income taxes in the United States and numerous foreign jurisdictions. We are subject to examination by various tax authorities in jurisdictions in which we have business operations or a taxable presence. We regularly assess the likelihood of additional assessments by tax authorities and provide for these matters as appropriate. Although we believe our tax estimates are appropriate, the final determination of tax audits and any related litigation could result in changes in our estimates.
	Accounting for income taxes requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the tax and financial reporting bases of assets and liabilities and for loss and credit carryforwards. Valuation allowances are provided when recovery of deferred tax assets does not meet the more likely than not standard as defined in GAAP.
	We have elected to recognize interest and penalties associated with uncertain tax positions as a component of the provision (benefit) for income taxes in the accompanying Consolidated Statements of Operations. We recorded an increase of $966 and $942 for gross interest and penalties for the three months ended March 31, 2014 and 2015, respectively. We had $5,884 and $6,167 accrued for the payment of interest and penalties as of December 31, 2014 and March 31, 2015, respectively.
	Our effective tax rate for the three months ended March 31, 2014 and 2015 was 45.8% and 27.6%, respectively. The primary reconciling items between the federal statutory rate of 35% and our overall effective tax rate in the three months ended March 31, 2014 were differences in the rates of tax at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates and state income taxes (net of federal tax benefit). During the three months ended March 31, 2014, there were foreign currency losses recorded in jurisdictions with tax rates lower than the federal statutory rate of 35% associated with our marking-to-market of intercompany loans, which increased our first quarter 2014 effective tax rate by 1.1%. In addition, the controlled foreign corporation look-through rule, which provided for the exception of certain foreign earnings from United States federal taxation as Subpart F income, expired on December 31, 2013 and as a result, our first quarter 2014 effective tax rate increased by 1.3%. The primary reconciling item between the federal statutory tax rate of 35% and our overall effective tax rate in the three months ended March 31, 2015 was due to differences in the rates of tax at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates.
	As a REIT, we are entitled to a deduction for dividends paid, resulting in a substantial reduction of federal income tax expense. As a REIT, substantially all of our income tax expense will be incurred based on the earnings generated by our foreign subsidiaries and our domestic TRSs.
Fair Value Measurements	Fair Value Measurements
	Entities are permitted under GAAP to elect to measure many financial instruments and certain other items at either fair value or cost. We did not elect the fair value measurement option.
	Our financial assets or liabilities that are carried at fair value are required to be measured using inputs from the three levels of the fair value hierarchy. A financial asset or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.
	The three levels of the fair value hierarchy are as follows:
	Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access at the measurement date.
	Level 2—Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).
	Level 3—Unobservable inputs that reflect our assumptions about the assumptions that market participants would use in pricing the asset or liability.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires us to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities at the date of the financial statements and for the period then ended. On an ongoing basis, we evaluate the estimates used. We base our estimates on historical experience, actuarial estimates, current conditions and various other assumptions that we believe to be reasonable under the circumstances. These estimates form the basis for making judgments about the carrying values of assets and liabilities and are not readily apparent from other sources. Actual results may differ from these estimates.
Property, Plant and Equipment and Long-Lived Assets	Property, Plant and Equipment and Long-Lived Assets
	We develop various software applications for internal use. Computer software costs associated with internal use software are expensed as incurred until certain capitalization criteria are met. Payroll and related costs for employees directly associated with, and devoting time to, the development of internal use computer software projects (to the extent time is spent directly on the project) are capitalized. During the three months ended March 31, 2014 and 2015, we capitalized $4,897 and $6,040 of costs, respectively, associated with the development of internal use computer software projects. Capitalization begins when the design stage of the application has been completed and it is probable that the project will be completed and used to perform the function intended. Capitalization ends when the asset is ready for its intended use. Depreciation begins when the software is placed in service. Computer software costs that are capitalized are periodically evaluated for impairment.
	We review long-lived assets and all amortizable intangible assets for impairment whenever events or changes in circumstances indicate the carrying amount of such assets may not be recoverable. Recoverability of these assets is determined by comparing the forecasted undiscounted net cash flows of the operation to which the assets relate to their carrying amount. The operations are generally distinguished by the business segment and geographic region in which they operate. If the operation is determined to be unable to recover the carrying amount of its assets, the long-lived assets are written down, on a pro rata basis, to fair value. Fair value is determined based on discounted cash flows or appraised values, depending upon the nature of the assets.
	As a result of our conversion to a REIT and in accordance with SEC rules applicable to REITs, we no longer report (gain) loss on the sale of real estate as a component of operating income, but we report it as a component of income (loss) from continuing operations. We report the (gain) loss on sale of property, plant and equipment (excluding real estate), along with any impairment, write-downs or involuntary conversions related to real estate, as a component of operating income. Previously reported amounts have been reclassified to conform to this presentation.
	Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $333 for the three months ended March 31, 2015 and consisted primarily of the write-off of certain property associated with our North American Records and Information Management Business segment. Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $1,152 for the three months ended March 31, 2014 and consisted primarily of losses associated with the write-off of certain software associated with our North American Records and Information Management Business segment.
	Consolidated gain on sale of real estate was $7,468, net of tax of $1,991, for the three months ended March 31, 2014 associated with the sale of two buildings in the United Kingdom.
Recent Accounting Pronouncements	Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"). ASU 2014-09 provides additional guidance for management to reassess revenue recognition as it relates to: (1) transfer of control, (2) variable consideration, (3) allocation of transaction price based on relative standalone selling price, (3) licenses, (4) time value of money and (5) contract costs. Further disclosures will be required to provide a better understanding of revenue that has been recognized and revenue that is expected to be recognized in the future from existing contracts. ASU 2014-09 is effective for us on January 1, 2017, with no early adoption permitted. In April 2015, the FASB tentatively decided to defer the effective date of ASU 2014-09 for one year to January 1, 2018, with early adoption permitted as of January 1, 2017. We are currently evaluating the impact ASU 2014-09 will have on our consolidated financial statements.
	In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements Going Concern (Subtopic 205-40) (“ASU 2014-15”). ASU 2014-15 requires management to assess an entity’s ability to continue as a going concern by incorporating and expanding upon certain principles of current United States auditing standards. Specifically, the amendments (1) provide a definition of the term “substantial doubt”, (2) require an evaluation every reporting period, including interim periods, (3) provide principles for considering the mitigating effect of management’s plans, (4) require certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) require an express statement and other disclosures when substantial doubt is still present, and (6) require an assessment for a period of one year after the date that the financial statements are issued (or available to be issued). ASU 2014‑15 is effective for us on January 1, 2017, with early adoption permitted. We do not believe that this pronouncement will have an impact on our consolidated financial statements.
	In February 2015, the FASB issued ASU No. 2015‑02, Consolidation (Topic 810): Amendments to the Consolidation Analysis (“ASU 2015‑02”). ASU 2015‑02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015‑02 is effective for us on January 1, 2016, with early adoption permitted. We do not believe that this pronouncement will have an impact on our consolidated financial statements.
	In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”).  The amendments in ASU 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts.  The recognition and measurement guidance for debt issuance costs are not affected by the amendments in ASU 2015-03.  ASU 2015‑03 is effective for us on January 1, 2016, with early adoption permitted.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Schedule of carrying value of goodwill, net for each of the reporting units	The carrying value of goodwill, net for each of our reporting units as of March 31, 2015 is as follows:
		Carrying Value
		as of
		March 31, 2015
	North American Records and Information Management(1)(2)	$	1,384,736
	North American Secure Shredding(1)(2)	40,788
	North American Data Management(3)	372,482
	Emerging Businesses(4)	—
	UKI(1)(5)	258,695
	Continental Western Europe(1)(5)	71,379
	Emerging Markets - Eastern Europe(6)	81,458
	Latin America(6)	92,993
	Australia and Singapore(6)	51,957
	Greater China(6)	3,518
	India(6)	—
	Russia, Ukraine and Denmark(6)	555
	Total	$	2,358,561
	The carrying value of goodwill, net for each of our reporting units as of December 31, 2014 was as follows:
		Carrying Value
		as of
		31-Dec-14
	North American Records and Information Management(1)	$	1,397,484
	Intellectual Property Management(1)	38,491
	Fulfillment Services(1)	3,247
	North American Data Management(2)	375,957
	Emerging Businesses(3)	—
	New Western Europe(4)	354,049
	Emerging Markets - Eastern Europe(5)	87,408
	Latin America(5)	107,240
	Australia and Singapore(5)	55,779
	Greater China(5)	3,500
	India(5)	—
	Russia, Ukraine and Denmark(5)	628
	Total	$	2,423,783
Schedule of changes in the carrying value of goodwill attributable to each reportable operating segment	The changes in the carrying value of goodwill attributable to each reportable operating segment for the three months ended March 31, 2015 are as follows:
		North American				North American				Western				Other International Business				Total
		Records and Information				Data				European Business								Consolidated
		Management				Management
		Business				Business
	Gross Balance as of December 31, 2014	$	1,645,209			$	429,982			$	412,322			$	254,706			$	2,742,219
	Non-deductible goodwill acquired during the year	—				—				1,546				—				1,546
	Fair value and other adjustments(1)	185				—				57				(395		)		(153		)
	Currency effects	(14,575		)		(3,648		)		(26,385		)		(23,684		)		(68,292		)
	Gross Balance as of March 31, 2015	$	1,630,819			$	426,334			$	387,540			$	230,627			$	2,675,320
	Accumulated Amortization Balance as of December 31, 2014	$	205,987			$	54,025			$	58,273			$	151			$	318,436
	Currency effects	(692		)		(173		)		(807		)		(5		)		(1,677		)
	Accumulated Amortization Balance as of March 31, 2015	$	205,295			$	53,852			$	57,466			$	146			$	316,759
	Net Balance as of December 31, 2014	$	1,439,222			$	375,957			$	354,049			$	254,555			$	2,423,783
	Net Balance as of March 31, 2015	$	1,425,524			$	372,482			$	330,074			$	230,481			$	2,358,561
	Accumulated Goodwill Impairment Balance as of December 31, 2014	$	85,909			$	—			$	46,500			$	—			$	132,409
	Accumulated Goodwill Impairment Balance as of March 31, 2015	$	85,909			$	—			$	46,500			$	—			$	132,409
	_______________________________________________________________________________
	-1	Total fair value and other adjustments primarily include $531 in net adjustments to deferred income taxes and $(4,619) related to customer relationships and acquisition costs and other assumed liabilities, as well as $3,935 of cash paid related to certain 2014 acquisitions.
Components of amortizable intangible assets	The components of our amortizable intangible assets as of December 31, 2014 and March 31, 2015 are as follows:
		31-Dec-14												31-Mar-15
		Gross Carrying				Accumulated				Net Carrying				Gross Carrying				Accumulated			Net Carrying
		Amount				Amortization				Amount				Amount				Amortization			Amount
	Customer Relationships and Acquisition Costs	$	904,866			$	(297,029	)		$	607,837			$	880,221			$	(299,780	)	$	580,441
	Core Technology(1)	3,568				(3,540		)		28				3,349				(3,315		)	34
	Trademarks and Non-Compete Agreements(1)	7,062				(5,068		)		1,994				6,469				(4,874		)	1,595
	Deferred Financing Costs	63,033				(15,956		)		47,077				62,892				(17,831		)	45,061
	Total	$	978,529			$	(321,593	)		$	656,936			$	952,931			$	(325,800	)	$	627,131
	_______________________________________________________________________________
	-1	Included in Other Assets, net in the accompanying Consolidated Balance Sheets.
Stock-based compensation expense for Employee Stock-Based Awards related to continuing operations	Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations related to continuing operations is as follows:
		Three Months
		Ended
		March 31,
		2014				2015
	Cost of sales (excluding depreciation and amortization)	$	190			$	45
	Selling, general and administrative expenses	6,951				6,811
	Total stock-based compensation	$	7,141			$	6,856
Summary of the weighted average assumptions used for stock option grants	The following table summarizes the weighted average assumptions used for grants in the respective period:
			Three Months Ended
			March 31,
	Weighted Average Assumptions		2014			2015
	Expected volatility		33.9	%		28.6	%
	Risk-free interest rate		2.06	%		1.71	%
	Expected dividend yield		4	%		5	%
	Expected life		6.8 years			5.5 years
Summary of stock option activity	A summary of option activity for the three months ended March 31, 2015 is as follows:
		Options			Weighted				Weighted		Average
					Average				Average		Intrinsic
					Exercise				Remaining		Value
					Price				Contractual
									Term (Years)
	Outstanding at December 31, 2014	3,678,246			$	23.37
	Granted	674,620			43.86
	Exercised	(233,791	)		20.93
	Forfeited	(19,119	)		23.97
	Expired	(11,045	)		22.15
	Outstanding at March 31, 2015	4,088,911			$	26.89			5.86		$	44,191
	Options exercisable at March 31, 2015	2,725,000			$	22.74			4.42		$	37,445
	Options expected to vest	1,265,183			$	34.97			8.71		$	6,435
Aggregate intrinsic value of stock options exercised	The following table provides the aggregate intrinsic value of stock options exercised for the three months ended March 31, 2014 and 2015:
		Three Months Ended
		March 31,
		2014				2015
	Aggregate intrinsic value of stock options exercised	$	977			$	4,167
Summary of restricted stock and RSU activity	A summary of restricted stock and RSU activity for the three months ended March 31, 2015 is as follows:
		Restricted			Weighted-
		Stock and RSUs			Average
					Grant-Date
					Fair Value
	Non-vested at December 31, 2014	1,405,569			$	28.78
	Granted	462,323			38.82
	Vested	(426,901	)		30.49
	Forfeited	(29,265	)		30.43
	Non-vested at March 31, 2015	1,411,726			$	31.52
Summary of Performance Unit (PU) activity	A summary of PU activity for the three months ended March 31, 2015 is as follows:
		Original			PU Adjustment(1)			Total			Weighted-
		PU Awards						PU Awards			Average
											Grant-Date
											Fair Value
	Non-vested at December 31, 2014	461,666			(82,609	)		379,057			$	30.8
	Granted	131,996			—			131,996			40.58
	Vested	(78,311	)		(4,769	)		(83,080	)		29.47
	Forfeited	(19,038	)		—			(19,038	)		30.96
	Non-vested at March 31, 2015	496,313			(87,378	)		408,935			$	34.22
	_______________________________________________________________________________
	-1	Represents an increase or decrease in the number of original PUs awarded based on either (a) the final performance criteria achievement at the end of the defined performance period of such PUs or (b) a change in estimated awards based on the forecasted performance against the predefined targets.
Calculation of basic and diluted net income (loss) per share attributable to the entity	The following table presents the calculation of basic and diluted income (loss) per share:
		Three Months Ended
		March 31,
		2014				2015
	Income (loss) from continuing operations	$	42,721			$	41,739
	Total (loss) income from discontinued operations	$	(612	)		$	—
	Net income (loss) attributable to Iron Mountain Incorporated	$	41,667			$	41,096
	Weighted-average shares—basic	191,879,000				210,237,000
	Effect of dilutive potential stock options	682,801				1,223,330
	Effect of dilutive potential restricted stock, RSUs and PUs	507,219				788,758
	Weighted-average shares—diluted	193,069,020				212,249,088
	Earnings (losses) per share—basic:
	Income (loss) from continuing operations	$	0.22			$	0.2
	Total (loss) income from discontinued operations	$	—			$	—
	Net income (loss) attributable to Iron Mountain Incorporated—basic	$	0.22			$	0.2
	Earnings (losses) per share—diluted:
	Income (loss) from continuing operations	$	0.22			$	0.2
	Total (loss) income from discontinued operations	$	—			$	—
	Net income (loss) attributable to Iron Mountain Incorporated—diluted	$	0.22			$	0.19
	Antidilutive stock options, RSUs and PUs, excluded from the calculation	1,380,962				358,233
Assets and liabilities carried at fair value measured on a recurring basis	The following tables provide the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2014 and March 31, 2015, respectively:
							Fair Value Measurements at
							December 31, 2014 Using
	Description		Total Carrying				Quoted prices						Significant other						Significant
			Value at				in active						observable						unobservable
			December 31,				markets						inputs						inputs
			2014				(Level 1)						(Level 2)						(Level 3)
	Money Market Funds(1)		$	36,828			$	—					$	36,828					$	—
	Time Deposits(1)		16,204				—						16,204						—
	Trading Securities		13,172				12,428				-2		744				-1		—
	Derivative Liabilities(3)		2,411				—						2,411						—
							Fair Value Measurements at
							March 31, 2015 Using
	Description		Total Carrying				Quoted prices						Significant other						Significant
			Value at				in active						observable						unobservable
			March 31,				markets						inputs						inputs
			2015				(Level 1)						(Level 2)						(Level 3)
	Money Market Funds(1)		$	20,000			$	—					$	20,000					$	—
	Time Deposits(1)		13,909				—						13,909						—
	Trading Securities		10,743				9,892				-2		851				-1		—
	Derivative Liabilities(3)		7,756				—						7,756						—
	_______________________________________________________________________________
	-1	Money market funds and time deposits (including certain trading securities) are measured based on quoted prices for similar assets and/or subsequent transactions.
	-2	Securities are measured at fair value using quoted market prices.
	-3	Derivative liabilities relate to short-term (six months or less) foreign currency contracts that we have entered into to hedge certain of our intercompany exposures, as more fully disclosed at Note 3. We calculate the value of such forward contracts by adjusting the spot rate utilized at the balance sheet date for translation purposes by an estimate of the forward points observed in active markets.
Schedule of changes in accumulated other comprehensive items, net	The changes in accumulated other comprehensive items, net for the three months ended March 31, 2014 and 2015, respectively, are as follows:
		Foreign				Market Value				Total
		Currency				Adjustments for
		Translation				Securities
		Adjustments
	Balance as of December 31, 2013	$	(9,586	)		$	926			$	(8,660	)
	Other comprehensive income (loss):
	Foreign currency translation adjustments	1,677				—				1,677
	Total other comprehensive income (loss)	1,677				—				1,677
	Balance as of March 31, 2014	$	(7,909	)		$	926			$	(6,983	)
		Foreign				Market Value				Total
		Currency				Adjustments for
		Translation				Securities
		Adjustments
	Balance as of December 31, 2014	$	(76,010	)		$	979			$	(75,031	)
	Other comprehensive income (loss):
	Foreign currency translation adjustments	(56,074		)		—				(56,074		)
	Market value adjustments for securities	—				23				23
	Total other comprehensive income (loss)	(56,074		)		23				(56,051		)
	Balance as of March 31, 2015	$	(132,084	)		$	1,002			$	(131,082	)
Other expense (income), net	Other expense, net consists of the following:
		Three Months Ended
		March 31,
		2014				2015
	Foreign currency transaction losses, net	$	6,438			$	22,266
	Other, net	(1,121		)		83
		$	5,317			$	22,349

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of derivative instruments	The following table provides the fair value of our derivative instruments as of December 31, 2014 and March 31, 2015 and their gains and losses for the three months ended March 31, 2014 and 2015:
		Liability Derivatives
		31-Dec-14						31-Mar-15
	Derivatives Not Designated as	Balance Sheet		Fair				Balance Sheet		Fair
	Hedging Instruments	Location		Value				Location		Value
	Foreign exchange contracts	Accrued expenses		$	2,411			Accrued expenses		$	7,756
	Total			$	2,411					$	7,756
Fair value of derivative instruments, amount of (gain) loss recognized in income
					Amount of (Gain)
					Loss
					Recognized in
					Income
					on Derivatives
					Three Months Ended March 31,
	Derivatives Not Designated as	Location of (Gain) Loss			2014				2015
	Hedging Instruments	Recognized in Income
		on Derivative
	Foreign exchange contracts	Other expense (income), net			$	2,922			$	28,533
	Total				$	2,922			$	28,533
Foreign exchange gains related to currency translation adjustments	As a result, we recorded the following foreign exchange gains (losses), net of tax, related to the change in fair value of such debt due to the currency translation adjustments, which is a component of accumulated other comprehensive items, net:
		Three Months Ended March 31,
		2014				2015
	Foreign exchange gains (losses)	$	145			$	4,930
	Tax expense (benefit) on foreign exchange gains (losses)	57				—
	Foreign exchange gains (losses), net of tax	$	88			$	4,930

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of carrying amount and fair value of long-term debt instruments	Long-term debt comprised the following:
		31-Dec-14					31-Mar-15
		Carrying			Fair		Carrying			Fair
		Amount			Value		Amount			Value
	Revolving Credit Facility(1)	$	883,428		$	883,428	$	823,881		$	823,881
	Term Loan(1)	249,375			249,375		248,750			248,750
	63/4% Euro Senior Subordinated Notes due 2018 (the "63/4% Notes")(2)(3)	308,616			309,634		273,760			274,369
	73/4% Senior Subordinated Notes due 2019 (the "73/4% Notes")(2)(3)	400,000			429,000		400,000			425,750
	83/8% Senior Subordinated Notes due 2021 (the "83/8% Notes")(2)(3)	106,030			110,500		106,038			109,836
	61/8% CAD Senior Notes due 2021 (the "CAD Notes")(2)(4)	172,420			175,437		157,470			162,194
	61/8% GBP Senior Notes due 2022 (the "GBP Notes")(2)(5)	622,960			639,282		592,160			620,998
	6% Senior Notes due 2023 (the "6% Notes")(2)(3)	600,000			625,500		600,000			631,500
	53/4% Senior Subordinated Notes due 2024 (the "53/4% Notes")(2)(3)	1,000,000			1,005,000		1,000,000			1,005,000
	Accounts Receivable Securitization Program(6)(7)	—			—		220,800			220,800
	Real Estate Mortgages, Capital Leases and Other(7)	320,702			320,702		298,983			298,983
	Total Long-term Debt	4,663,531					4,721,842
	Less Current Portion	(52,095		)			(54,483		)
	Long-term Debt, Net of Current Portion	$	4,611,436				$	4,667,359
	______________________________________________________________________________
	-1	The capital stock or other equity interests of most of our United States subsidiaries, and up to 66% of the capital stock or other equity interests of our first-tier foreign subsidiaries, are pledged to secure these debt instruments, together with all intercompany obligations (including promissory notes) of subsidiaries owed to us or to one of our United States subsidiary guarantors. In addition, Iron Mountain Canada Operations ULC ("Canada Company") has pledged 66% of the capital stock of its subsidiaries, and all intercompany obligations (including promissory notes) owed to or held by it, to secure the Canadian dollar subfacility under the Revolving Credit Facility (defined below). The fair value (Level 3 of fair value hierarchy described at Note 2.k.) of these debt instruments approximates the carrying value (as borrowings under these debt instruments are based on current variable market interest rates (plus a margin that is subject to change based on our consolidated leverage ratio)), as of both December 31, 2014 and March 31, 2015.
	-2	The fair values (Level 1 of fair value hierarchy described at Note 2.k.) of these debt instruments are based on quoted market prices for these notes on December 31, 2014 and March 31, 2015, respectively.
	-3	Collectively, the "Parent Notes." IMI is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior or senior subordinated basis, as the case may be, by most of its direct and indirect 100% owned United States subsidiaries (the "Guarantors"). These guarantees are joint and several obligations of the Guarantors. Canada Company, Iron Mountain Europe PLC ("IME"), the Special Purpose Subsidiaries (as defined below) and the remainder of our subsidiaries do not guarantee the Parent Notes.
	-4	Canada Company is the direct obligor on the CAD Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI and the Guarantors. These guarantees are joint and several obligations of IMI and the Guarantors. See Note 5 to Notes to Consolidated Financial Statements.
	-5	IME is the direct obligor on the GBP Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI and the Guarantors. These guarantees are joint and several obligations of IMI and the Guarantors. See Note 5 to Notes to Consolidated Financial Statements.
	-6	The Special Purpose Subsidiaries are the obligors under this program.
	-7	We believe the fair value (Level 3 of fair value hierarchy described at Note 2.k.) of this debt approximates its carrying
	value

Selected_Consolidated_Financia1

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors (Tables)	3 Months Ended
	Mar. 31, 2015
Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors
Schedule of selected consolidated Balance sheet statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONSOLIDATED BALANCE SHEETS
		31-Dec-14
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Assets
	Current Assets:
	Cash and Cash Equivalents	$	2,399		$	4,713		$	4,979		$	113,842		$	—		$	125,933
	Restricted Cash	33,860			—			—			—			—			33,860
	Accounts Receivable	—			361,330			37,137			205,798			—			604,265
	Intercompany Receivable	—			586,725			—			—			(586,725		)	—
	Other Current Assets	153			88,709			2,925			61,908			(34		)	153,661
	Total Current Assets	36,412			1,041,477			45,041			381,548			(586,759		)	917,719
	Property, Plant and Equipment, Net	840			1,580,337			160,977			808,573			—			2,550,727
	Other Assets, Net:
	Long-term Notes Receivable from Affiliates and Intercompany Receivable	2,851,651			245			2,448			—			(2,854,344		)	—
	Investment in Subsidiaries	917,170			656,877			30,751			93,355			(1,698,153		)	—
	Goodwill	—			1,611,957			180,342			631,484			—			2,423,783
	Other	31,108			375,082			26,672			245,251			—			678,113
	Total Other Assets, Net	3,799,929			2,644,161			240,213			970,090			(4,552,497		)	3,101,896
	Total Assets	$	3,837,181		$	5,265,975		$	446,231		$	2,160,211		$	(5,139,256	)	$	6,570,342
	Liabilities and Equity
	Intercompany Payable	$	505,083		$	—		$	3,564		$	78,078		$	(586,725	)	$	—
	Current Portion of Long-term Debt	—			24,955			—			27,174			(34		)	52,095
	Total Other Current Liabilities	60,097			470,122			35,142			239,280			—			804,641
	Long-term Debt, Net of Current Portion	2,414,646			908,431			245,861			1,042,498			—			4,611,436
	Long-term Notes Payable to Affiliates and Intercompany Payable	1,000			2,851,384			—			1,960			(2,854,344		)	—
	Other Long-term Liabilities	—			115,789			37,558			78,868			—			232,215
	Commitments and Contingencies (See Note 7)
	Total Iron Mountain Incorporated Stockholders' Equity	856,355			895,294			124,106			678,753			(1,698,153		)	856,355
	Noncontrolling Interests	—			—			—			13,600			—			13,600
	Total Equity	856,355			895,294			124,106			692,353			(1,698,153		)	869,955
	Total Liabilities and Equity	$	3,837,181		$	5,265,975		$	446,231		$	2,160,211		$	(5,139,256	)	$	6,570,342
	CONSOLIDATED BALANCE SHEETS (Continued)
		31-Mar-15
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Assets
	Current Assets:
	Cash and Cash Equivalents	$	—		$	7,395		$	7,120		$	105,090		$	—		$	119,605
	Restricted Cash	20,000			—			—			—			—			20,000
	Accounts Receivable	—			14,842			33,975			541,209			—			590,026
	Intercompany Receivable	—			857,050			—			—			(857,050		)	—
	Other Current Assets	573			93,214			3,043			61,041			(29		)	157,842
	Total Current Assets	20,573			972,501			44,138			707,340			(857,079		)	887,473
	Property, Plant and Equipment, Net	795			1,580,203			147,886			747,918			—			2,476,802
	Other Assets, Net:
	Long-term Notes Receivable from Affiliates and Intercompany Receivable	2,919,207			1,000			2,234			—			(2,922,441		)	—
	Investment in Subsidiaries	867,150			607,661			28,066			91,633			(1,594,510		)	—
	Goodwill	—			1,612,151			165,582			580,828			—			2,358,561
	Other	30,145			375,615			24,370			218,488			—			648,618
	Total Other Assets, Net	3,816,502			2,596,427			220,252			890,949			(4,516,951		)	3,007,179
	Total Assets	$	3,837,870		$	5,149,131		$	412,276		$	2,346,207		$	(5,374,030	)	$	6,371,454
	Liabilities and Equity
	Intercompany Payable	$	658,287		$	—		$	3,292		$	195,471		$	(857,050	)	$	—
	Current Portion of Long-term Debt	—			23,254			—			31,258			(29		)	54,483
	Total Other Current Liabilities	55,930			394,054			26,613			189,251			—			665,848
	Long-term Debt, Net of Current Portion	2,379,798			846,299			227,442			1,213,820			—			4,667,359
	Long-term Notes Payable to Affiliates and Intercompany Payable	1,000			2,921,441			—			—			(2,922,441		)	—
	Other Long-term Liabilities	—			118,005			35,230			74,027			—			227,262
	Commitments and Contingencies (See Note 7)
	Total Iron Mountain Incorporated Stockholders' Equity	742,855			846,078			119,699			628,733			(1,594,510		)	742,855
	Noncontrolling Interests	—			—			—			13,647			—			13,647
	Total Equity	742,855			846,078			119,699			642,380			(1,594,510		)	756,502
	Total Liabilities and Equity	$	3,837,870		$	5,149,131		$	412,276		$	2,346,207		$	(5,374,030	)	$	6,371,454
Schedule of selected consolidated Income statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONSOLIDATED STATEMENTS OF OPERATIONS
		Three Months Ended March 31, 2014
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Revenues:
	Storage Rental	$	—		$	300,329		$	30,411		$	128,149		$	—		$	458,889
	Service	—			186,430			16,150			108,657			—			311,237
	Intercompany Service	—			—			—			17,358			(17,358		)	—
	Total Revenues	—			486,759			46,561			254,164			(17,358		)	770,126
	Operating Expenses:
	Cost of Sales (Excluding Depreciation and Amortization)	—			202,920			6,242			125,983			—			335,145
	Intercompany Service Cost of Sales	—			—			17,358			—			(17,358		)	—
	Selling, General and Administrative	28			146,578			3,753			64,421			—			214,780
	Depreciation and Amortization	77			52,640			2,999			30,717			—			86,433
	Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	—			929			1			222			—			1,152
	Total Operating Expenses	105			403,067			30,353			221,343			(17,358		)	637,510
	Operating (Loss) Income	(105		)	83,692			16,208			32,821			—			132,616
	Interest Expense (Income), Net	48,165			(4,852		)	9,547			9,452			—			62,312
	Other (Income) Expense, Net	(1,280		)	1,507			(20		)	5,110			—			5,317
	(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	(46,990		)	87,037			6,681			18,259			—			64,987
	Provision (Benefit) for Income Taxes	—			23,803			2,538			3,393			—			29,734
	(Gain) Loss on Sale of Real Estate, Net of Tax	—			(197		)	—			(7,271		)	—			(7,468		)
	Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(88,657		)	(24,826		)	(1,954		)	(4,143		)	119,580			—
	Income (Loss) from Continuing Operations	41,667			88,257			6,097			26,280			(119,580		)	42,721
	(Loss) Income from Discontinued Operations, Net of Tax	—			(625		)	—			13			—			(612		)
	Net Income (Loss)	41,667			87,632			6,097			26,293			(119,580		)	42,109
	Less: Net Income (Loss) Attributable to Noncontrolling Interest	—			—			—			442			—			442
	Net Income (Loss) Attributable to Iron Mountain Incorporated	$	41,667		$	87,632		$	6,097		$	25,851		$	(119,580	)	$	41,667
	Net Income (Loss)	$	41,667		$	87,632		$	6,097		$	26,293		$	(119,580	)	$	42,109
	Other Comprehensive Income (Loss):
	Foreign Currency Translation Adjustments	88			741			(2,618		)	3,577			—			1,788
	Equity in Other Comprehensive Income (Loss) of Subsidiaries	1,589			(71		)	(1,160		)	(2,618		)	2,260			—
	Total Other Comprehensive Income (Loss)	1,677			670			(3,778		)	959			2,260			1,788
	Comprehensive Income (Loss)	43,344			88,302			2,319			27,252			(117,320		)	43,897
	Comprehensive Income (Loss) Attributable to Noncontrolling Interests	—			—			—			553			—			553
	Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$	43,344		$	88,302		$	2,319		$	26,699		$	(117,320	)	$	43,344
	CONSOLIDATED STATEMENTS OF OPERATIONS (Continued)
		Three Months Ended March 31, 2015
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Revenues:
	Storage Rental	$	—		$	304,592		$	30,868		$	123,412		$	—		$	458,872
	Service	—			180,865			16,557			92,992			—			290,414
	Intercompany Service	—			352			—			16,419			(16,771		)	—
	Total Revenues	—			485,809			47,425			232,823			(16,771		)	749,286
	Operating Expenses:
	Cost of Sales (Excluding Depreciation and Amortization)	—			196,661			7,165			117,828			—			321,654
	Intercompany Service Cost of Sales	—			—			16,419			352			(16,771		)	—
	Selling, General and Administrative	73			132,192			4,167			59,982			—			196,414
	Depreciation and Amortization	46			55,403			3,052			27,450			—			85,951
	Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	—			322			—			11			—			333
	Total Operating Expenses	119			384,578			30,803			205,623			(16,771		)	604,352
	Operating (Loss) Income	(119		)	101,231			16,622			27,200			—			144,934
	Interest Expense (Income), Net	39,170			(6,677		)	8,203			24,202			—			64,898
	Other (Income) Expense, Net	(2,038		)	1,383			(127		)	23,131			—			22,349
	(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	(37,251		)	106,525			8,546			(20,133		)	—			57,687
	Provision (Benefit) for Income Taxes	—			9,702			3,063			3,183			—			15,948
	Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(78,347		)	18,740			(1,059		)	(5,483		)	66,149			—
	Net Income (Loss)	41,096			78,083			6,542			(17,833		)	(66,149		)	41,739
	Less: Net Income (Loss) Attributable to Noncontrolling Interests	—			—			—			643			—			643
	Net Income (Loss) Attributable to Iron Mountain Incorporated	$	41,096		$	78,083		$	6,542		$	(18,476	)	$	(66,149	)	$	41,096
	Net Income (Loss)	$	41,096		$	78,083		$	6,542		$	(17,833	)	$	(66,149	)	$	41,739
	Other Comprehensive Income (Loss):
	Foreign Currency Translation Adjustments	4,930			—			(7,940		)	(53,165		)	—			(56,175		)
Market Value Adjustments for Securities	—			23			—			—			—			23
Equity in Other Comprehensive (Loss) Income of Subsidiaries	(60,981		)	(60,896		)	(3,007		)	(7,940		)	132,824			—
Total Other Comprehensive (Loss) Income	(56,051		)	(60,873		)	(10,947		)	(61,105		)	132,824			(56,152		)
Comprehensive (Loss) Income	(14,955		)	17,210			(4,405		)	(78,938		)	66,675			(14,413		)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	—			—			—			542			—			542
Comprehensive (Loss) Income Attributable to Iron Mountain Incorporated	$	(14,955	)	$	17,210		$	(4,405	)	$	(79,480	)	$	66,675		$	(14,955	)
Schedule of selected consolidated cash flow statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONSOLIDATED STATEMENTS OF CASH FLOWS
		Three Months Ended March 31, 2014
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Cash Flows from Operating Activities:
	Cash Flows from Operating Activities—Continuing Operations	$	(68,972	)	$	79,555		$	10,421		$	34,637		$	—		$	55,641
	Cash Flows from Investing Activities:
	Capital expenditures	—			(71,520		)	(2,865		)	(33,471		)	—			(107,856		)
	Cash paid for acquisitions, net of cash acquired	—			916			—			(31,697		)	—			(30,781		)
	Intercompany loans to subsidiaries	377,202			61,895			—			—			(439,097		)	—
	Investment in subsidiaries	(11,695		)	(11,695		)	—			—			23,390			—
	Additions to customer relationship and acquisition costs	—			(7,341		)	(280		)	(537		)	—			(8,158		)
	Proceeds from sales of property and equipment and other, net (including real estate)	—			1,441			64			16,387			—			17,892
	Cash Flows from Investing Activities—Continuing Operations	365,507			(26,304		)	(3,081		)	(49,318		)	(415,707		)	(128,903		)
	Cash Flows from Financing Activities:
	Repayment of revolving credit and term loan facilities and other debt	—			(2,171,941		)	(252,107		)	(30,643		)	—			(2,454,691		)
	Proceeds from revolving credit and term loan facilities and other debt	—			2,480,901			242,480			152,666			—			2,876,047
	Early retirement of senior subordinated notes	(247,275		)	—			—			—			—			(247,275		)
	Debt (repayment to) financing and equity contribution from (distribution to) noncontrolling interests, net	—			—			—			(2,317		)	—			(2,317		)
	Intercompany loans from parent	—			(376,788		)	8,640			(70,949		)	439,097			—
	Equity contribution from parent	—			11,695			—			11,695			(23,390		)	—
	Parent cash dividends	(52,735		)	—			—			—			—			(52,735		)
	Proceeds from exercise of stock options and employee stock purchase plan	2,417			—			—			—			—			2,417
	Excess tax (deficiency) benefits from stock-based compensation	(185		)	—			—			—			—			(185		)
	Payment of debt financing costs and stock issuance costs	—			—			(12		)	(410		)	—			(422		)
	Cash Flows from Financing Activities—Continuing Operations	(297,778		)	(56,133		)	(999		)	60,042			415,707			120,839
	Effect of exchange rates on cash and cash equivalents	—			—			136			1,667			—			1,803
	(Decrease) Increase in cash and cash equivalents	(1,243		)	(2,882		)	6,477			47,028			—			49,380
	Cash and cash equivalents, beginning of period	1,243			10,366			1,094			107,823			—			120,526
	Cash and cash equivalents, end of period	$	—		$	7,484		$	7,571		$	154,851		$	—		$	169,906
	CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)
		Three Months Ended March 31, 2015
		Parent			Guarantors			Canada			Non-			Eliminations			Consolidated
								Company			Guarantors
	Cash Flows from Operating Activities:
	Cash Flows from Operating Activities—Continuing Operations	$	(45,978	)	$	44,864		$	3,636		$	2,990		$	—		$	5,512
	Cash Flows from Investing Activities:
	Capital expenditures	—			(46,452		)	(3,774		)	(24,550		)	—			(74,776		)
	Cash paid for acquisitions, net of cash acquired	—			(684		)	106			(5,853		)	—			(6,431		)
	Intercompany loans to subsidiaries	132,692			79,946			—			—			(212,638		)	—
	Investment in subsidiaries	(5,000		)	(5,000		)	—			—			10,000			—
	Increase in restricted cash	13,860			—			—			—			—			13,860
	Additions to customer relationship and acquisition costs	—			(7,990		)	(668		)	(585		)	—			(9,243		)
	Proceeds from sales of property and equipment and other, net (including real estate)	—			160			6			244			—			410
	Cash Flows from Investing Activities—Continuing Operations	141,552			19,980			(4,330		)	(30,744		)	(202,638		)	(76,180		)
	Cash Flows from Financing Activities:
	Repayment of revolving credit and term loan facilities and other debt	—			(1,894,836		)	(159,145		)	(228,280		)	—			(2,282,261		)
	Proceeds from revolving credit and term loan facilities and other debt	—			1,823,900			161,962			464,541			—			2,450,403
	Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	—			—			—			(388		)	—			(388		)
	Intercompany loans from parent	—			4,638			79			(217,355		)	212,638			—
	Equity contribution from parent	—			5,000			—			5,000			(10,000		)	—
	Parent cash dividends	(102,539		)	—			—			—			—			(102,539		)
	Proceeds from exercise of stock options and employee stock purchase plan	4,364			—			—			—			—			4,364
	Excess tax benefits (deficiency) from stock-based compensation	231			—			—			—			—			231
	Payment of debt financing costs and stock issuance costs	(29		)	(864		)	—			(54		)	—			(947		)
	Cash Flows from Financing Activities—Continuing Operations	(97,973		)	(62,162		)	2,896			23,464			202,638			68,863
	Effect of exchange rates on cash and cash equivalents	—			—			(61		)	(4,462		)	—			(4,523		)
	(Decrease) Increase in cash and cash equivalents	(2,399		)	2,682			2,141			(8,752		)	—			(6,328		)
	Cash and cash equivalents, beginning of period	2,399			4,713			4,979			113,842			—			125,933
	Cash and cash equivalents, end of period	$	—		$	7,395		$	7,120		$	105,090		$	—		$	119,605

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of analysis of business segment information and reconciliation	An analysis of our business segment information and reconciliation to the accompanying Consolidated Financial Statements is as follows:
			North American				North American			Western European Business		Other International Business		Corporate			Total
			Records and				Data							and Other			Consolidated
			Information				Management							Business
			Management				Business
			Business
	Three Months Ended March 31, 2014
	Total Revenues		$	446,132			$	96,724		$	117,131	$	107,299	$	2,840		$	770,126
	Depreciation and Amortization		45,506				5,030			14,340		14,419		7,138			86,433
	Depreciation		40,821				4,965			12,014		9,775		7,138			74,713
	Amortization		4,685				65			2,326		4,644		—			11,720
	Adjusted OIBDA		169,209				54,668			34,563		24,200		(54,116		)	228,524
	Total Assets (1)		3,632,489				666,188			1,131,454		994,657		281,829			6,706,617
	Expenditures for Segment Assets		49,266				5,507			10,787		54,154		27,081			146,795
	Capital Expenditures		42,561				5,507			9,974		22,733		27,081			107,856
	Cash Paid for Acquisitions, Net of Cash Acquired		(916		)		—			296		31,401		—			30,781
	Additions to Customer Relationship and Acquisition Costs		7,621				—			517		20		—			8,158
	Three Months Ended March 31, 2015
	Total Revenues		442,687				97,235			100,812		103,991		4,561			749,286
	Depreciation and Amortization		45,303				5,344			11,439		14,265		9,600			85,951
	Depreciation		40,336				5,284			9,986		9,632		9,553			74,791
	Amortization		4,967				60			1,453		4,633		47			11,160
	Adjusted OIBDA		181,480				51,288			29,453		20,835		(51,838		)	231,218
	Total Assets (1)		3,623,905				648,507			896,380		911,481		291,181			6,371,454
	Expenditures for Segment Assets		42,375				4,949			7,588		22,548		12,990			90,450
	Capital Expenditures		33,180				4,907			4,410		19,289		12,990			74,776
	Cash Paid for Acquisitions, Net of Cash Acquired		600				(21		)	2,819		3,033		—			6,431
	Additions to Customer Relationship and Acquisition Costs		8,595				63			359		226		—			9,243
	_______________________________________________________________________________
	-1	Excludes all intercompany receivables or payables and investment in subsidiary balances.
Schedule of reconciliation of Adjusted OIBDA to income from continuing operations before provision (benefit) for income taxes on a consolidated basis	A reconciliation of Adjusted OIBDA to income (loss) from continuing operations before provision (benefit) for income taxes and (gain) loss on sale of real estate on a consolidated basis is as follows:
		Three Months Ended
		March 31,
		2014				2015
	Adjusted OIBDA	$	228,524			$	231,218
	Less: Depreciation and Amortization	86,433				85,951
	Loss on Disposal/Write-Down of Property, Plant and Equipment (Excluding Real Estate), Net	1,152				333
	REIT Costs(1)	8,323				—
	Interest Expense, Net	62,312				64,898
	Other Expense, Net	5,317				22,349
	Income from Continuing Operations before Provision for Income Taxes and Gain on Sale of Real Estate	$	64,987			$	57,687
	_______________________________________________________________________________
	-1	Includes costs associated with our conversion to a REIT, excluding REIT compliance costs beginning January 1, 2014 which we expect to recur in future periods ("REIT Costs").

Stockholders_Equity_Matters_Ta

Stockholders' Equity Matters (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of dividend declared and payments	In fiscal year 2014 and in the first quarter of 2015, our board of directors declared the following dividends:
	Declaration Date	Dividend		Record Date	Total		Payment Date
		Per Share			Amount
	14-Mar-14	$	0.27	March 25, 2014	$	51,812	April 15, 2014
	28-May-14	0.27		June 25, 2014	52,033		July 15, 2014
	15-Sep-14	0.475		September 25, 2014	91,993		October 15, 2014
	September 15, 2014 (1)	3.6144		30-Sep-14	700,000		4-Nov-14
	November 17, 2014 (2)	0.255		28-Nov-14	53,450		15-Dec-14
	17-Nov-14	0.475		5-Dec-14	99,617		22-Dec-14
	19-Feb-15	0.475		6-Mar-15	99,795		20-Mar-15
	_______________________________________________________________________________
	(1) Represents Special Distribution.
	(2) Represents Catch-Up Distribution.

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Cash and Cash Equivalents and Foreign Currency (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Cash and Cash Equivalents and Restricted Cash [Abstract]
Restricted cash	$20,000		$33,860
Foreign Currency
Foreign currency transaction gains (loss)	$22,266	$6,438
The 7 1/4% Notes
Foreign Currency
Stated interest rate (as a percent)	7.25%		7.25%
6 3/4% Notes
Foreign Currency
Stated interest rate (as a percent)	6.75%		6.75%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Goodwill (Details) (USD $)	0 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Oct. 01, 2014	Mar. 31, 2015
		segment
Goodwill
Goodwill impairment charge	$0
North American Records and Information Management business
Goodwill
Number of reporting units		2
Western Europe
Goodwill
Number of reporting units		2

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Schedule of Carrying Value of Goodwill, by Reporting Unit (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill
Goodwill	$2,358,561	$2,423,783
North American Records and Information Management business
Goodwill
Goodwill	1,425,524	1,439,222
North American Records and Information Management business | North American Records And Information Management
Goodwill
Goodwill	1,384,736	1,397,484
North American Records and Information Management business | Intellectual Property Management
Goodwill
Goodwill		38,491
North American Records and Information Management business | Fulfillment Services
Goodwill
Goodwill		3,247
North American Records and Information Management business | North American Secure Shredding
Goodwill
Goodwill	40,788
North American Data Management Business
Goodwill
Goodwill	372,482	375,957
Corporate and Other | Emerging Businesses
Goodwill
Goodwill	0	0
Western European Business | United Kingdom, Ireland, Norway
Goodwill
Goodwill	258,695
Western European Business | Continental Western Europe
Goodwill
Goodwill	71,379
Other International Business | Western Europe
Goodwill
Goodwill		354,049
Other International Business | Emerging Markets - Eastern Europe
Goodwill
Goodwill	81,458	87,408
Other International Business | Latin America
Goodwill
Goodwill	92,993	107,240
Other International Business | Australia Singapore
Goodwill
Goodwill	51,957	55,779
Other International Business | Greater China
Goodwill
Goodwill	3,518	3,500
Other International Business | INDIA
Goodwill
Goodwill	0	0
Other International Business | Russia, Ukraine and Denmark
Goodwill
Goodwill	$555	$628

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Schedule of Changes in Carrying Value of Goodwill, by Reportable Operating Segment (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Gross amount of goodwill [Roll Forward]
Beginning balance	$2,742,219
Non-deductible goodwill acquired during the year	1,546
Fair value and other adjustments	-153
Currency effects	-68,292
Ending balance	2,675,320
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	318,436
Currency effects	-1,677
Accumulated amortization. ending balance	316,759
Net goodwill, beginning balance	2,423,783
Net goodwill, ending balance	2,358,561
Accumulated goodwill impairment, beginning balance	132,409
Accumulated goodwill impairment, ending balance	132,409
Fair value and other adjustments related to deferred income taxes	531
Fair value and other adjustments related to customer relationships	-4,619
Cash paid related to goodwill to acquire prior year acquisitions	3,935
North American Records and Information Management Business
Gross amount of goodwill [Roll Forward]
Beginning balance	1,645,209
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	185
Currency effects	-14,575
Ending balance	1,630,819
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	205,987
Currency effects	-692
Accumulated amortization. ending balance	205,295
Net goodwill, beginning balance	1,439,222
Net goodwill, ending balance	1,425,524
Accumulated goodwill impairment, beginning balance	85,909
Accumulated goodwill impairment, ending balance	85,909
North American Data Management Business
Gross amount of goodwill [Roll Forward]
Beginning balance	429,982
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	0
Currency effects	-3,648
Ending balance	426,334
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	54,025
Currency effects	-173
Accumulated amortization. ending balance	53,852
Net goodwill, beginning balance	375,957
Net goodwill, ending balance	372,482
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Western European Business
Gross amount of goodwill [Roll Forward]
Beginning balance	412,322
Non-deductible goodwill acquired during the year	1,546
Fair value and other adjustments	57
Currency effects	-26,385
Ending balance	387,540
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	58,273
Currency effects	-807
Accumulated amortization. ending balance	57,466
Net goodwill, beginning balance	354,049
Net goodwill, ending balance	330,074
Accumulated goodwill impairment, beginning balance	46,500
Accumulated goodwill impairment, ending balance	46,500
Other International Business
Gross amount of goodwill [Roll Forward]
Beginning balance	254,706
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	-395
Currency effects	-23,684
Ending balance	230,627
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	151
Currency effects	-5
Accumulated amortization. ending balance	146
Net goodwill, beginning balance	254,555
Net goodwill, ending balance	230,481
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	$0

Summary_of_Significant_Account7

Summary of Significant Accounting Policies - Schedule of Components of Amortizable Intangible Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Amortizable intangible assets
Gross carrying amount	$952,931		$978,529
Accumulated amortization	-325,800		-321,593
Net carrying amount	627,131		656,936
Amortization of other deferred charges	13,252	13,626
Customer Relationships and Acquisition Costs
Amortizable intangible assets
Gross carrying amount	880,221		904,866
Accumulated amortization	-299,780		-297,029
Net carrying amount	580,441		607,837
Core Technology
Amortizable intangible assets
Gross carrying amount	3,349		3,568
Accumulated amortization	-3,315		-3,540
Net carrying amount	34		28
Trademarks and Non-Compete Agreements
Amortizable intangible assets
Gross carrying amount	6,469		7,062
Accumulated amortization	-4,874		-5,068
Net carrying amount	1,595		1,994
Deferred Financing Costs
Amortizable intangible assets
Gross carrying amount	62,892		63,033
Accumulated amortization	-17,831		-15,956
Net carrying amount	$45,061		$47,077

Summary_of_Significant_Account8

Summary of Significant Accounting Policies - Stock-Based Compensation (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee stock-based awards
Stock-based compensation	$6,856	$7,141
Stock-based compensation expense (income), net of tax	4,946	5,134
Stock-based compensation expense per basic and diluted share (in dollars per share)	$0.02	$0.03
Excess tax (deficiency) benefit from stock-based compensation	231	-185
Share-Based Compensation, aggregate disclosures
Employee stock-based awards, unrecognized compensation costs on nonvested awards	53,880
Employee stock-based awards, unrecognized compensation costs on nonvested awards, weighted average period of recognition	2 years 3 months 18 days
Stock Options
Employee stock-based awards
Certain options as a percentage of total outstanding options	45.70%
Weighted average fair value of options granted (in dollars per share)	$4.99	$5.60
Weighted average assumptions used for grants
Expected volatility (as a percent)	28.60%	33.90%
Risk-free interest rate (as a percent)	1.71%	2.06%
Expected dividend yield (as a percent)	5.00%	4.00%
Expected life of the option	5 years 6 months	6 years 9 months 18 days
Summary of option activity
Options outstanding balance, beginning of period (in shares)	3,678,246
Options granted (in shares)	674,620
Options exercised (in shares)	-233,791
Options forfeited (in shares)	-19,119
Options expired (in shares)	-11,045
Options outstanding balance, end of period (in shares)	4,088,911
Options exercisable balance (in shares)	2,725,000
Options expected to vest (in shares)	1,265,183
Weighted Average Exercise Price
Weighted average exercise price, options outstanding balance beginning of period (in dollars per share)	$23.37
Weighted average exercise price, options granted (in dollars per share)	$43.86
Weighted average exercise price, options exercised (in dollars per share)	$20.93
Weighted average exercise price, options forfeited (in dollars per share)	$23.97
Weighted average exercise price, options expired (in dollars per share)	$22.15
Weighted average exercise price, options outstanding balance end of period (in dollars per share)	$26.89
Weighted average exercise price, options exercisable (in dollars per share)	$22.74
Weighted average exercise price, options expected to vest (in dollars per share)	$34.97
Weighted average remaining contractual term
Weighted average remaining contractual term, options outstanding	5 years 10 months 10 days
Weighted average remaining contractual term, options exercisable	4 years 5 months 1 day
Weighted average remaining contractual term, options expected to vest	8 years 8 months 16 days
Aggregate intrinsic value
Aggregate intrinsic value, options outstanding	44,191
Aggregate intrinsic value, options exercisable	37,445
Aggregate intrinsic value, options expected to vest	6,435
Aggregate intrinsic value of stock options exercised
Aggregate intrinsic value of stock options exercised	4,167	977
Stock Options | Non-Employee Directors
Employee stock-based awards
Award vesting period	1 year
Certain options
Employee stock-based awards
Award vesting period	10 years
Contractual term of awards	12 years
Certain options as a percentage of total outstanding options	7.20%
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Employee stock purchase plan, number of offering periods	2
Employee stock purchase plan, duration of offering periods	6 months
Employee stock purchase plan, maximum employee subscription rate percent	15.00%
Percentage of market price for the purchase of shares	95.00%
Employee stock purchase plan, shares available for grant	960,638
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	1,405,569
Granted (in shares)	462,323
Vested (in shares)	-426,901
Forfeited (in shares)	-29,265
Non-vested at the end of the period (in shares)	1,411,726
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share)	$28.78
Weighted average grant date fair value, granted (in dollars per share)	$38.82
Weighted average grant date fair value, vested (in dollars per share)	$30.49
Weighted average grant date fair value, forfeited (in dollars per share)	$30.43
Weighted average grant date fair value, non-vested, end of period (in dollars per share)	$31.52
Restricted Stock and Restricted Stock Units | Minimum
Employee stock-based awards
Award vesting period	3 years
Restricted Stock and Restricted Stock Units | Maximum
Employee stock-based awards
Award vesting period	5 years
Performance units
Dividends accrued
Accrued cash dividends	211	150
Cash dividends paid	1,015	221
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	379,057
Granted (in shares)	131,996
Vested (in shares)	-83,080
Forfeited (in shares)	-19,038
Non-vested at the end of the period (in shares)	408,935
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share)	$30.80
Weighted average grant date fair value, granted (in dollars per share)	$40.58
Weighted average grant date fair value, vested (in dollars per share)	$29.47
Weighted average grant date fair value, forfeited (in dollars per share)	$30.96
Weighted average grant date fair value, non-vested, end of period (in dollars per share)	$34.22
Total fair value of shares or units vested	2,063	4,030
Performance units disclosure
Period of anniversary from the date of grant	1 year
Qualifying age for grant of performance units	55 years
Qualifying service period	10 years
Percentage of achievement of the predefined revenue and ROIC targets	100.00%	60.00%
Performance units | Revenue or revenue growth and return on invested capital | PUs granted prior to 2014
Performance units disclosure
Performance period	1 year
Performance units | Revenue or revenue growth and return on invested capital | PUs granted in 2014
Performance units disclosure
Performance period	3 years
Performance units | Market condition associated with shareholder return of common stock
Performance units disclosure
Performance period	3 years
Performance units | Minimum | Revenue or revenue growth and return on invested capital | PUs granted prior to 2014
Performance units disclosure
Percentage payout rate	0.00%
Performance units | Minimum | Revenue or revenue growth and return on invested capital | PUs granted in 2014
Performance units disclosure
Percentage payout rate	0.00%
Performance units | Minimum | Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	0.00%
Performance units | Maximum | Revenue or revenue growth and return on invested capital | PUs granted prior to 2014
Performance units disclosure
Percentage payout rate	150.00%
Performance units | Maximum | Revenue or revenue growth and return on invested capital | PUs granted in 2014
Performance units disclosure
Percentage payout rate	200.00%
Performance units | Maximum | Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	200.00%
Original PU Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	461,666
Granted (in shares)	131,996
Vested (in shares)	-78,311
Forfeited (in shares)	-19,038
Non-vested at the end of the period (in shares)	496,313
PUs Adjustment
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	-82,609
Granted (in shares)	0
Vested (in shares)	-4,769
Forfeited (in shares)	0
Non-vested at the end of the period (in shares)	-87,378
Restricted Stock Units
Dividends accrued
Accrued cash dividends	670	434
Cash dividends paid	1,729	831
Weighted average grant date fair value
Total fair value of shares or units vested	15,584	13,844
Continuing Operations
Employee stock-based awards
Stock-based compensation	6,856	7,141
Continuing Operations | Cost of sales (excluding depreciation and amortization)
Employee stock-based awards
Stock-based compensation	45	190
Continuing Operations | Selling, general and administrative expenses
Employee stock-based awards
Stock-based compensation	$6,811	$6,951

Summary_of_Significant_Account9

Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubful Accounts, Income Taxes, and Concentration of Credit Risk (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	bank		fund
	fund		bank
Income (Loss) Per Share-Basic and Diluted
Income (loss) from continuing operations	$41,739,000	$42,721,000
Total (loss) income from discontinued operations	0	-612,000
Net income (loss) attributable to Iron Mountain Incorporated	41,096,000	41,667,000
Weighted-average shares—basic	210,237,000	191,879,000
Effect of dilutive potential stock options (in shares)	1,223,330	682,801
Effect of dilutive potential restricted stock, RSUs and PUs (in shares)	788,758	507,219
Weighted-average shares—diluted	212,249,088	193,069,020
Earnings (Losses) per share-basic:
Income (Loss) from continuing operations (in dollars per share)	$0.20	$0.22
Total (loss) income income discontinued operations (see Note 9) (in dollars per share)	$0	$0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)	$0.20	$0.22
Earnings (Losses) per share-diluted:
Income (Loss) from continuing operations (in dollars per share)	$0.20	$0.22
Total (loss) income from discontinued operations (see Note 9) (in dollars per share)	$0	$0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)	$0.19	$0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares)	358,233	1,380,962
Allowance for Doubtful Accounts and Credit Memo Reserves
The general period to charge-off uncollectible balances of receivable, as circumstances warrant, is no later than this period of time past due	1 year
Income Taxes:
Period of time subject to a separate corporate income tax	10 years
Increase (decrease) in gross interest and penalties recorded	942,000	966,000
Accrued interest and penalties recorded	6,167,000		5,884,000
Effective tax rates (as a percent)	27.60%	45.80%
Federal statutory tax rate (as a percent)		35.00%
Effective tax rate increase (decrease) (as a percent)		1.10%
FX impact on increase (decrease) in effective income tax rate (as a percent)		1.30%
Concentrations of Credit Risk
Number of global banks with cash, cash equivalent and restricted cash held on deposit	3		3
Number of "Triple A" rated money market funds with cash, cash equivalent and restricted cash held on deposit	1		2
Maximum investment limit in any one mutual fund	50,000,000
Maximum investment limit in any one financial institution	75,000,000
Cash, cash equivalent and restricted cash	139,605,000		159,793,000
Money market funds and time deposits	$33,909,000		$53,032,000

Recovered_Sheet1

Summary of Significant Accounting Policies - Fair Value Measurements (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Foreign Currency Cash Flow Hedges
Maximum Length of Time Hedged in Foreign Currency Cash Flow Hedge	6 months
Fair value measured on recurring basis | Quoted prices in active markets (Level 1)
Assets and liabilities carried at fair value measured on a recurring basis
Money market funds	0	$0
Time deposits	0	0
Trading securities	9,892	12,428
Derivative liabilities	0	0
Fair value measured on recurring basis | Significant other observable inputs (Level 2)
Assets and liabilities carried at fair value measured on a recurring basis
Money market funds	20,000	36,828
Time deposits	13,909	16,204
Trading securities	851	744
Derivative liabilities	7,756	2,411
Fair value measured on recurring basis | Significant unobservable inputs (Level 3)
Assets and liabilities carried at fair value measured on a recurring basis
Money market funds	0	0
Time deposits	0	0
Trading securities	0	0
Derivative liabilities	0	0
Estimate of Fair Value Measurement [Member] | Fair value measured on recurring basis
Assets and liabilities carried at fair value measured on a recurring basis
Money market funds	20,000	36,828
Time deposits	13,909	16,204
Trading securities	10,743	13,172
Derivative liabilities	7,756	$2,411

Recovered_Sheet2

Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Changes in accumulated other comprehensive items
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	($75,031)	($8,660)
Other comprehensive loss:
Foreign currency translation adjustments	-56,074	1,677
Market value adjustments for securities	23
Total Other comprehensive (loss) income	-56,051	1,677
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	-131,082	-6,983
Other Expense (Income), Net:
Foreign currency transaction losses (gains), net	22,266	6,438
Other, net	83	-1,121
Other Expense, Net	22,349	5,317
Foreign currency translation adjustments
Changes in accumulated other comprehensive items
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	-76,010	-9,586
Other comprehensive loss:
Foreign currency translation adjustments	-56,074	1,677
Market value adjustments for securities	0
Total Other comprehensive (loss) income	-56,074	1,677
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	-132,084	-7,909
Market value adjustments for securities
Changes in accumulated other comprehensive items
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	979	926
Other comprehensive loss:
Foreign currency translation adjustments	0	0
Market value adjustments for securities	23
Total Other comprehensive (loss) income	23	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$1,002	$926

Recovered_Sheet3

Summary of Significant Accounting Policies - Property, Plant and Equipment and Long-Lived Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Capitalization of internal use computer software	$6,040	$4,897
Gain (loss) on disposal/write-down of property, plant and equipment (excluding real estate)	333	1,152
Gain on Sale of Real Estate, Net of Tax	0	7,468
Income tax expense on gain of real estate		$1,991

Derivative_Instruments_and_Hed2

Derivative Instruments and Hedging Activities (Details)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2015
In Thousands, unless otherwise specified	derivative	derivative	6 3/4% Notes	6 3/4% Notes	6 3/4% Notes	Foreign exchange contracts	Foreign exchange contracts	Forward contracts	Forward contracts
			Net Investment Hedging [Member]	Net Investment Hedging [Member]	Net Investment Hedging [Member]	USD ($)	USD ($)	Purchases	Sales
			Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]	Designated as Hedging Instrument [Member]			Euros : U.S. dollars	Euros : U.S. dollars
			USD ($)	EUR (€)	EUR (€)			EUR (€)	USD ($)
Derivative instruments
Targeted percentage of debt portfolio to be fixed with interest rates	75.00%
Number of derivative instrument with contingent features of credit risk	0	0
Notional amount of derivatives				€ 36,000	€ 64,208			€ 206,000	$229,845
Net cash payments from foreign currency forward contracts						16,820	7,199
Derivatives used in Net Investment Hedge, Net of Tax			$18,742

Derivative_Instruments_and_Hed3

Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details) (Derivatives Not Designated as Hedging Instruments, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair value of derivative instruments
Liability Derivatives	$7,756	$2,411
Foreign exchange contracts | Other Liabilities [Member]
Fair value of derivative instruments
Liability Derivatives	$7,756	$2,411

Derivative_Instruments_and_Hed4

Derivative Instruments and Hedging Activities - Amount of (Gain) Loss in Income on Derivatives (Details) (Derivatives Not Designated as Hedging Instruments, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Gains and losses on derivative instruments
Amount of (Gain) Loss Recognized in Income on Derivatives	$28,533	$2,922
Foreign exchange contracts | Other (income) expense, net
Gains and losses on derivative instruments
Amount of (Gain) Loss Recognized in Income on Derivatives	$28,533	$2,922

Derivative_Instruments_and_Hed5

Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Schedule of Foreign Exchange Gains Related to Fair of Debt (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign exchange gains (losses)	$4,930	$145
Tax expense (benefit) on foreign exchange gains (losses)	0	57
Foreign exchange gains (losses), net of tax	$4,930	$88

Debt_Schedule_of_Long_Term_Deb

Debt Schedule of Long Term Debt (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Carrying amount on long-term debt	$4,721,842	$4,663,531
Current portion of long-term debt	-54,483	-52,095
Long-term Debt, net of current portion	4,667,359	4,611,436
Revolving Credit Facility
Debt Instrument [Line Items]
Carrying amount on long-term debt	823,881	883,428
Fair Value	823,881	883,428
Term Loan Facility
Debt Instrument [Line Items]
Carrying amount on long-term debt	248,750	249,375
Fair Value	248,750	249,375
6 3/4% Notes
Debt Instrument [Line Items]
Carrying amount on long-term debt	273,760	308,616
Fair Value	274,369	309,634
Stated interest rate (as a percent)	6.75%	6.75%
The 7 3/4% Notes
Debt Instrument [Line Items]
Carrying amount on long-term debt	400,000	400,000
Fair Value	425,750	429,000
Stated interest rate (as a percent)	7.75%	7.75%
The 8 3/8% Notes
Debt Instrument [Line Items]
Carrying amount on long-term debt	106,038	106,030
Fair Value	109,836	110,500
Stated interest rate (as a percent)	8.38%	8.38%
Senior Subsidiary Notes
Debt Instrument [Line Items]
Carrying amount on long-term debt	157,470	172,420
Fair Value	162,194	175,437
Stated interest rate (as a percent)	6.13%	6.13%
GBP Senior Notes 6.125 Percent, Due 2022
Debt Instrument [Line Items]
Carrying amount on long-term debt	592,160	622,960
Fair Value	620,998	639,282
Stated interest rate (as a percent)	6.13%
6% Notes
Debt Instrument [Line Items]
Carrying amount on long-term debt	600,000	600,000
Fair Value	631,500	625,500
Stated interest rate (as a percent)	6.00%	6.00%
The 5 3/4% Notes
Debt Instrument [Line Items]
Carrying amount on long-term debt	1,000,000	1,000,000
Fair Value	1,005,000	1,005,000
Stated interest rate (as a percent)	5.75%	5.75%
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Carrying amount on long-term debt	220,800	0
Fair Value	220,800	0
Real Estate Mortgages, Capital Leases and Other
Debt Instrument [Line Items]
Carrying amount on long-term debt	298,983	320,702
Fair Value	$298,983	$320,702

Debt_Details

Debt (Details)

Mar. 31, 2015

Dec. 31, 2014

Mar. 06, 2015

Mar. 31, 2015

Mar. 06, 2015

Aug. 07, 2013

Mar. 31, 2015

Dec. 31, 2014

Mar. 31, 2015

Mar. 31, 2015

Dec. 31, 2014

Mar. 31, 2015

Dec. 31, 2014

Mar. 31, 2015

Mar. 31, 2014

Dec. 31, 2014

Aug. 07, 2013

Mar. 31, 2015

Mar. 31, 2015

Mar. 31, 2015

Mar. 31, 2015

Mar. 31, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 24, 2014

Mar. 31, 2015

Dec. 31, 2014

Sep. 24, 2014

USD ($)

USD ($)

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Credit Agreement

Credit Agreement

Credit Agreement

Credit Agreement

Credit Agreement

Credit Agreement

Credit Agreement

Credit Agreement

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Term Loan Facility

Term Loan Facility

Term Loan Facility

Term Loan Facility

Term Loan Facility

Accounts Receivable Securitization Program

Accounts Receivable Securitization Program

Accounts Receivable Securitization Program

USD ($)

CAD

Minimum

Minimum

Maximum

Maximum

USD ($)

USD ($)

USD ($)

USD ($)

USD

EUR

CAD

AUD

Minimum

Maximum

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Canada Company

USD ($)

EUR (€)

Debt

Capital stock of subsidiaries pledged to secure debt (as a percent)

66.00%

66.00%

66.00%

Ownership in U.S. subsidiaries that are considered guarantor (as a percent)

100.00%

Maximum borrowing capacity

$250,000,000

$1,500,000,000

Optional additional commitments

500,000,000

250,000,000

Principal amount of notes

250,000,000

Debt Instrument, Frequency of Periodic Payment

quarterly

Amount of quarterly installments based on the original principal (as a percentage)

625

Commitment fee (as a percent)

0.40%

0.30%

0.50%

Carrying amount on long-term debt

4,721,842,000

4,663,531,000

823,881,000

883,428,000

632,250,000

67,750,000

81,200,000

71,600,000

248,750,000

249,375,000

Fair Value

823,881,000

883,428,000

248,750,000

249,375,000

Letters of credit outstanding

12,219,000

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

663,900,000

Average interest rate (as a percent)

2.80%

2.90%

2.40%

Effective interest rate (as a percent)

1.10%

2.30%

5.10%

Commitment fees and letters of credit fees

867,000

658,000

Accounts Receivable from Securitization

$220,800,000

Debt covenants

Net total lease adjusted leverage ratio

5.5

5.4

6.5

6.5

Net secured debt lease adjusted leverage ratio

2.7

2.6

4

4

Bond leverage ratio, per indentures

5.6

5.7

6.5

6.5

Fixed charge coverage ratio

2.4

2.5

1.5

1.5

Selected_Consolidated_Financia2

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Balance Sheets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Consolidating financial statements
Percentage of subsidiaries owned	100.00%
Current Assets:
Cash and Cash Equivalents	$119,605	$125,933	$169,906	$120,526
Restricted Cash	20,000	33,860
Accounts Receivable	590,026	604,265
Intercompany Receivable	0	0
Other Current Assets	157,842	153,661
Total Current Assets	887,473	917,719
Property, Plant and Equipment, Net	2,476,802	2,550,727
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0	0
Investment in Subsidiaries	0	0
Goodwill	2,358,561	2,423,783
Other	648,618	678,113
Total Other Assets, net	3,007,179	3,101,896
Total Assets	6,371,454	6,570,342	6,706,617
Liabilities and Equity
Intercompany Payable	0	0
Current Portion of Long-term Debt	54,483	52,095
Total Other Current Liabilities	665,848	804,641
Long-term Debt, Net of Current Portion	4,667,359	4,611,436
Long-term Notes Payable to Affiliates and Intercompany Payable	0	0
Other Long-term Liabilities	227,262	232,215
Commitments and Contingencies (see Note 7)
Total Iron Mountain Incorporated Stockholders' Equity	742,855	856,355
Noncontrolling Interests	13,647	13,600
Total Equity	756,502	869,955	1,045,071	1,051,734
Total Liabilities and Equity	6,371,454	6,570,342
Eliminations
Current Assets:
Cash and Cash Equivalents	0	0	0	0
Restricted Cash	0	0
Accounts Receivable	0	0
Intercompany Receivable	-857,050	-586,725
Other Current Assets	-29	-34
Total Current Assets	-857,079	-586,759
Property, Plant and Equipment, Net	0	0
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	-2,922,441	-2,854,344
Investment in Subsidiaries	-1,594,510	-1,698,153
Goodwill	0	0
Other	0	0
Total Other Assets, net	-4,516,951	-4,552,497
Total Assets	-5,374,030	-5,139,256
Liabilities and Equity
Intercompany Payable	-857,050	-586,725
Current Portion of Long-term Debt	-29	-34
Total Other Current Liabilities	0	0
Long-term Debt, Net of Current Portion	0	0
Long-term Notes Payable to Affiliates and Intercompany Payable	-2,922,441	-2,854,344
Other Long-term Liabilities	0	0
Total Iron Mountain Incorporated Stockholders' Equity	-1,594,510	-1,698,153
Noncontrolling Interests	0	0
Total Equity	-1,594,510	-1,698,153
Total Liabilities and Equity	-5,374,030	-5,139,256
Parent | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	0	2,399	0	1,243
Restricted Cash	20,000	33,860
Accounts Receivable	0	0
Intercompany Receivable	0	0
Other Current Assets	573	153
Total Current Assets	20,573	36,412
Property, Plant and Equipment, Net	795	840
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	2,919,207	2,851,651
Investment in Subsidiaries	867,150	917,170
Goodwill	0	0
Other	30,145	31,108
Total Other Assets, net	3,816,502	3,799,929
Total Assets	3,837,870	3,837,181
Liabilities and Equity
Intercompany Payable	658,287	505,083
Current Portion of Long-term Debt	0	0
Total Other Current Liabilities	55,930	60,097
Long-term Debt, Net of Current Portion	2,379,798	2,414,646
Long-term Notes Payable to Affiliates and Intercompany Payable	1,000	1,000
Other Long-term Liabilities	0	0
Total Iron Mountain Incorporated Stockholders' Equity	742,855	856,355
Noncontrolling Interests	0	0
Total Equity	742,855	856,355
Total Liabilities and Equity	3,837,870	3,837,181
Guarantors | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	7,395	4,713	7,484	10,366
Restricted Cash	0	0
Accounts Receivable	14,842	361,330
Intercompany Receivable	857,050	586,725
Other Current Assets	93,214	88,709
Total Current Assets	972,501	1,041,477
Property, Plant and Equipment, Net	1,580,203	1,580,337
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	1,000	245
Investment in Subsidiaries	607,661	656,877
Goodwill	1,612,151	1,611,957
Other	375,615	375,082
Total Other Assets, net	2,596,427	2,644,161
Total Assets	5,149,131	5,265,975
Liabilities and Equity
Intercompany Payable	0	0
Current Portion of Long-term Debt	23,254	24,955
Total Other Current Liabilities	394,054	470,122
Long-term Debt, Net of Current Portion	846,299	908,431
Long-term Notes Payable to Affiliates and Intercompany Payable	2,921,441	2,851,384
Other Long-term Liabilities	118,005	115,789
Total Iron Mountain Incorporated Stockholders' Equity	846,078	895,294
Noncontrolling Interests	0	0
Total Equity	846,078	895,294
Total Liabilities and Equity	5,149,131	5,265,975
Canada Company | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	7,120	4,979	7,571	1,094
Restricted Cash	0	0
Accounts Receivable	33,975	37,137
Intercompany Receivable	0	0
Other Current Assets	3,043	2,925
Total Current Assets	44,138	45,041
Property, Plant and Equipment, Net	147,886	160,977
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	2,234	2,448
Investment in Subsidiaries	28,066	30,751
Goodwill	165,582	180,342
Other	24,370	26,672
Total Other Assets, net	220,252	240,213
Total Assets	412,276	446,231
Liabilities and Equity
Intercompany Payable	3,292	3,564
Current Portion of Long-term Debt	0	0
Total Other Current Liabilities	26,613	35,142
Long-term Debt, Net of Current Portion	227,442	245,861
Long-term Notes Payable to Affiliates and Intercompany Payable	0	0
Other Long-term Liabilities	35,230	37,558
Total Iron Mountain Incorporated Stockholders' Equity	119,699	124,106
Noncontrolling Interests	0	0
Total Equity	119,699	124,106
Total Liabilities and Equity	412,276	446,231
Non-Guarantors | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	105,090	113,842	154,851	107,823
Restricted Cash	0	0
Accounts Receivable	541,209	205,798
Intercompany Receivable	0	0
Other Current Assets	61,041	61,908
Total Current Assets	707,340	381,548
Property, Plant and Equipment, Net	747,918	808,573
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0	0
Investment in Subsidiaries	91,633	93,355
Goodwill	580,828	631,484
Other	218,488	245,251
Total Other Assets, net	890,949	970,090
Total Assets	2,346,207	2,160,211
Liabilities and Equity
Intercompany Payable	195,471	78,078
Current Portion of Long-term Debt	31,258	27,174
Total Other Current Liabilities	189,251	239,280
Long-term Debt, Net of Current Portion	1,213,820	1,042,498
Long-term Notes Payable to Affiliates and Intercompany Payable	0	1,960
Other Long-term Liabilities	74,027	78,868
Total Iron Mountain Incorporated Stockholders' Equity	628,733	678,753
Noncontrolling Interests	13,647	13,600
Total Equity	642,380	692,353
Total Liabilities and Equity	$2,346,207	$2,160,211

Selected_Consolidated_Financia3

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Statements of Operations (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Storage Rental	$458,872	$458,889
Service	290,414	311,237
Intercompany Service	0	0
Total Revenues	749,286	770,126
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	321,654	335,145
Intercompany Service Cost of Sales	0	0
Selling, General and Administrative	196,414	214,780
Depreciation and Amortization	85,951	86,433
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	333	1,152
Total Operating Expenses	604,352	637,510
Operating (Loss) Income	144,934	132,616
Interest Expense (Income), Net	64,898	62,312
Other (Income) Expense, Net	22,349	5,317
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	57,687	64,987
Provision for Income Taxes	15,948	29,734
Gain on Sale of Real Estate, Net of Tax	0	-7,468
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0
Income from Continuing Operations	41,739	42,721
(Loss) Income from Discontinued Operations, Net of Tax	0	-612
Net Income (loss)	41,739	42,109
Less: Net Income Attributable to Noncontrolling Interests	643	442
Net income (loss) attributable to Iron Mountain Incorporated	41,096	41,667
Net Income	41,739	42,109
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	-56,175	1,788
Market Value Adjustments for Securities	23	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0
Total Other Comprehensive Income (Loss)	-56,152	1,788
Comprehensive Income (Loss)	-14,413	43,897
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	542	553
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	-14,955	43,344
Eliminations
Revenues:
Storage Rental	0	0
Service	0	0
Intercompany Service	-16,771	-17,358
Total Revenues	-16,771	-17,358
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0
Intercompany Service Cost of Sales	-16,771	-17,358
Selling, General and Administrative	0	0
Depreciation and Amortization	0	0
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	0
Total Operating Expenses	-16,771	-17,358
Operating (Loss) Income	0	0
Interest Expense (Income), Net	0	0
Other (Income) Expense, Net	0	0
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	0	0
Provision for Income Taxes	0	0
Gain on Sale of Real Estate, Net of Tax		0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	66,149	119,580
Income from Continuing Operations		-119,580
(Loss) Income from Discontinued Operations, Net of Tax		0
Net Income (loss)	-66,149	-119,580
Less: Net Income Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	-66,149	-119,580
Net Income	-66,149	-119,580
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	0	0
Market Value Adjustments for Securities	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	132,824	2,260
Total Other Comprehensive Income (Loss)	132,824	2,260
Comprehensive Income (Loss)	66,675	-117,320
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	66,675	-117,320
Parent | Reportable legal entities
Revenues:
Storage Rental	0	0
Service	0	0
Intercompany Service	0	0
Total Revenues	0	0
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0
Intercompany Service Cost of Sales	0	0
Selling, General and Administrative	73	28
Depreciation and Amortization	46	77
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	0
Total Operating Expenses	119	105
Operating (Loss) Income	-119	-105
Interest Expense (Income), Net	39,170	48,165
Other (Income) Expense, Net	-2,038	-1,280
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	-37,251	-46,990
Provision for Income Taxes	0	0
Gain on Sale of Real Estate, Net of Tax		0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	-78,347	-88,657
Income from Continuing Operations		41,667
(Loss) Income from Discontinued Operations, Net of Tax		0
Net Income (loss)	41,096	41,667
Less: Net Income Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	41,096	41,667
Net Income	41,096	41,667
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	4,930	88
Market Value Adjustments for Securities	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	-60,981	1,589
Total Other Comprehensive Income (Loss)	-56,051	1,677
Comprehensive Income (Loss)	-14,955	43,344
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	-14,955	43,344
Guarantors | Reportable legal entities
Revenues:
Storage Rental	304,592	300,329
Service	180,865	186,430
Intercompany Service	352	0
Total Revenues	485,809	486,759
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	196,661	202,920
Intercompany Service Cost of Sales	0	0
Selling, General and Administrative	132,192	146,578
Depreciation and Amortization	55,403	52,640
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	322	929
Total Operating Expenses	384,578	403,067
Operating (Loss) Income	101,231	83,692
Interest Expense (Income), Net	-6,677	-4,852
Other (Income) Expense, Net	1,383	1,507
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	106,525	87,037
Provision for Income Taxes	9,702	23,803
Gain on Sale of Real Estate, Net of Tax		-197
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	18,740	-24,826
Income from Continuing Operations		88,257
(Loss) Income from Discontinued Operations, Net of Tax		-625
Net Income (loss)	78,083	87,632
Less: Net Income Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	78,083	87,632
Net Income	78,083	87,632
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	0	741
Market Value Adjustments for Securities	23
Equity in Other Comprehensive Income (Loss) of Subsidiaries	-60,896	-71
Total Other Comprehensive Income (Loss)	-60,873	670
Comprehensive Income (Loss)	17,210	88,302
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	17,210	88,302
Canada Company | Reportable legal entities
Revenues:
Storage Rental	30,868	30,411
Service	16,557	16,150
Intercompany Service	0	0
Total Revenues	47,425	46,561
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	7,165	6,242
Intercompany Service Cost of Sales	16,419	17,358
Selling, General and Administrative	4,167	3,753
Depreciation and Amortization	3,052	2,999
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	1
Total Operating Expenses	30,803	30,353
Operating (Loss) Income	16,622	16,208
Interest Expense (Income), Net	8,203	9,547
Other (Income) Expense, Net	-127	-20
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	8,546	6,681
Provision for Income Taxes	3,063	2,538
Gain on Sale of Real Estate, Net of Tax		0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	-1,059	-1,954
Income from Continuing Operations		6,097
(Loss) Income from Discontinued Operations, Net of Tax		0
Net Income (loss)	6,542	6,097
Less: Net Income Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	6,542	6,097
Net Income	6,542	6,097
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	-7,940	-2,618
Market Value Adjustments for Securities	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	-3,007	-1,160
Total Other Comprehensive Income (Loss)	-10,947	-3,778
Comprehensive Income (Loss)	-4,405	2,319
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	-4,405	2,319
Non-Guarantors | Reportable legal entities
Revenues:
Storage Rental	123,412	128,149
Service	92,992	108,657
Intercompany Service	16,419	17,358
Total Revenues	232,823	254,164
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	117,828	125,983
Intercompany Service Cost of Sales	352	0
Selling, General and Administrative	59,982	64,421
Depreciation and Amortization	27,450	30,717
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	11	222
Total Operating Expenses	205,623	221,343
Operating (Loss) Income	27,200	32,821
Interest Expense (Income), Net	24,202	9,452
Other (Income) Expense, Net	23,131	5,110
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes and (Gain) Loss on Sale of Real Estate	-20,133	18,259
Provision for Income Taxes	3,183	3,393
Gain on Sale of Real Estate, Net of Tax		-7,271
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	-5,483	-4,143
Income from Continuing Operations		26,280
(Loss) Income from Discontinued Operations, Net of Tax		13
Net Income (loss)	-17,833	26,293
Less: Net Income Attributable to Noncontrolling Interests	643	442
Net income (loss) attributable to Iron Mountain Incorporated	-18,476	25,851
Net Income	-17,833	26,293
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	-53,165	3,577
Market Value Adjustments for Securities	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	-7,940	-2,618
Total Other Comprehensive Income (Loss)	-61,105	959
Comprehensive Income (Loss)	-78,938	27,252
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	542	553
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	($79,480)	$26,699

Selected_Consolidated_Financia4

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Statements of Cash Flows (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	$5,512	$55,641
Cash Flows from Investing Activities:
Capital expenditures	-74,776	-107,856
Cash paid for acquisitions, net of cash acquired	-6,431	-30,781
Intercompany loans to subsidiaries	0	0
Investment in subsidiaries	0	0
Increase in restricted cash	13,860	0
Additions to customer relationship and acquisition costs	-9,243	-8,158
Proceeds from sales of property and equipment and other, net (including real estate)	410	17,892
Cash Flows from Investing Activities—Continuing Operations	-76,180	-128,903
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	-2,282,261	-2,454,691
Proceeds from revolving credit and term loan facilities and other debt	2,450,403	2,876,047
Early retirement of senior subordinated notes	0	-247,275
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	-388	-2,317
Intercompany loans from parent	0	0
Equity contribution from parent	0	0
Parent cash dividends	-102,539	-52,735
Proceeds from exercise of stock options and employee stock purchase plan	4,364	2,417
Excess tax (deficiency) benefit from stock-based compensation	231	-185
Payment of debt financing and stock issuance costs	-947	-422
Cash Flows from Financing Activities—Continuing Operations	68,863	120,839
Effect of exchange rates on cash and cash equivalents	-4,523	1,803
(Decrease) Increase in cash and cash equivalents	-6,328	49,380
Cash and cash equivalents, beginning of period	125,933	120,526
Cash and cash equivalents, end of period	119,605	169,906
Eliminations
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	0	0
Cash Flows from Investing Activities:
Capital expenditures	0	0
Cash paid for acquisitions, net of cash acquired	0	0
Intercompany loans to subsidiaries	-212,638	-439,097
Investment in subsidiaries	10,000	23,390
Increase in restricted cash	0
Additions to customer relationship and acquisition costs	0	0
Proceeds from sales of property and equipment and other, net (including real estate)	0	0
Cash Flows from Investing Activities—Continuing Operations	-202,638	-415,707
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	0	0
Proceeds from revolving credit and term loan facilities and other debt	0	0
Early retirement of senior subordinated notes		0
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	0	0
Intercompany loans from parent	212,638	439,097
Equity contribution from parent	-10,000	-23,390
Parent cash dividends	0	0
Proceeds from exercise of stock options and employee stock purchase plan	0	0
Excess tax (deficiency) benefit from stock-based compensation	0	0
Payment of debt financing and stock issuance costs	0	0
Cash Flows from Financing Activities—Continuing Operations	202,638	415,707
Effect of exchange rates on cash and cash equivalents	0	0
(Decrease) Increase in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Parent | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	-45,978	-68,972
Cash Flows from Investing Activities:
Capital expenditures	0	0
Cash paid for acquisitions, net of cash acquired	0	0
Intercompany loans to subsidiaries	132,692	377,202
Investment in subsidiaries	-5,000	-11,695
Increase in restricted cash	13,860
Additions to customer relationship and acquisition costs	0	0
Proceeds from sales of property and equipment and other, net (including real estate)	0	0
Cash Flows from Investing Activities—Continuing Operations	141,552	365,507
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	0	0
Proceeds from revolving credit and term loan facilities and other debt	0	0
Early retirement of senior subordinated notes		-247,275
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	0	0
Intercompany loans from parent	0	0
Equity contribution from parent	0	0
Parent cash dividends	-102,539	-52,735
Proceeds from exercise of stock options and employee stock purchase plan	4,364	2,417
Excess tax (deficiency) benefit from stock-based compensation	231	-185
Payment of debt financing and stock issuance costs	-29	0
Cash Flows from Financing Activities—Continuing Operations	-97,973	-297,778
Effect of exchange rates on cash and cash equivalents	0	0
(Decrease) Increase in cash and cash equivalents	-2,399	-1,243
Cash and cash equivalents, beginning of period	2,399	1,243
Cash and cash equivalents, end of period	0	0
Guarantors | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	44,864	79,555
Cash Flows from Investing Activities:
Capital expenditures	-46,452	-71,520
Cash paid for acquisitions, net of cash acquired	-684	916
Intercompany loans to subsidiaries	79,946	61,895
Investment in subsidiaries	-5,000	-11,695
Increase in restricted cash	0
Additions to customer relationship and acquisition costs	-7,990	-7,341
Proceeds from sales of property and equipment and other, net (including real estate)	160	1,441
Cash Flows from Investing Activities—Continuing Operations	19,980	-26,304
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	-1,894,836	-2,171,941
Proceeds from revolving credit and term loan facilities and other debt	1,823,900	2,480,901
Early retirement of senior subordinated notes		0
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	0	0
Intercompany loans from parent	4,638	-376,788
Equity contribution from parent	5,000	11,695
Parent cash dividends	0	0
Proceeds from exercise of stock options and employee stock purchase plan	0	0
Excess tax (deficiency) benefit from stock-based compensation	0	0
Payment of debt financing and stock issuance costs	-864	0
Cash Flows from Financing Activities—Continuing Operations	-62,162	-56,133
Effect of exchange rates on cash and cash equivalents	0	0
(Decrease) Increase in cash and cash equivalents	2,682	-2,882
Cash and cash equivalents, beginning of period	4,713	10,366
Cash and cash equivalents, end of period	7,395	7,484
Canada Company | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	3,636	10,421
Cash Flows from Investing Activities:
Capital expenditures	-3,774	-2,865
Cash paid for acquisitions, net of cash acquired	106	0
Intercompany loans to subsidiaries	0	0
Investment in subsidiaries	0	0
Increase in restricted cash	0
Additions to customer relationship and acquisition costs	-668	-280
Proceeds from sales of property and equipment and other, net (including real estate)	6	64
Cash Flows from Investing Activities—Continuing Operations	-4,330	-3,081
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	-159,145	-252,107
Proceeds from revolving credit and term loan facilities and other debt	161,962	242,480
Early retirement of senior subordinated notes		0
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	0	0
Intercompany loans from parent	79	8,640
Equity contribution from parent	0	0
Parent cash dividends	0	0
Proceeds from exercise of stock options and employee stock purchase plan	0	0
Excess tax (deficiency) benefit from stock-based compensation	0	0
Payment of debt financing and stock issuance costs	0	-12
Cash Flows from Financing Activities—Continuing Operations	2,896	-999
Effect of exchange rates on cash and cash equivalents	-61	136
(Decrease) Increase in cash and cash equivalents	2,141	6,477
Cash and cash equivalents, beginning of period	4,979	1,094
Cash and cash equivalents, end of period	7,120	7,571
Non-Guarantors | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	2,990	34,637
Cash Flows from Investing Activities:
Capital expenditures	-24,550	-33,471
Cash paid for acquisitions, net of cash acquired	-5,853	-31,697
Intercompany loans to subsidiaries	0	0
Investment in subsidiaries	0	0
Increase in restricted cash	0
Additions to customer relationship and acquisition costs	-585	-537
Proceeds from sales of property and equipment and other, net (including real estate)	244	16,387
Cash Flows from Investing Activities—Continuing Operations	-30,744	-49,318
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	-228,280	-30,643
Proceeds from revolving credit and term loan facilities and other debt	464,541	152,666
Early retirement of senior subordinated notes		0
Debt (repayment to) financing and equity (distribution to) contribution from noncontrolling interests, net	-388	-2,317
Intercompany loans from parent	-217,355	-70,949
Equity contribution from parent	5,000	11,695
Parent cash dividends	0	0
Proceeds from exercise of stock options and employee stock purchase plan	0	0
Excess tax (deficiency) benefit from stock-based compensation	0	0
Payment of debt financing and stock issuance costs	-54	-410
Cash Flows from Financing Activities—Continuing Operations	23,464	60,042
Effect of exchange rates on cash and cash equivalents	-4,462	1,667
(Decrease) Increase in cash and cash equivalents	-8,752	47,028
Cash and cash equivalents, beginning of period	113,842	107,823
Cash and cash equivalents, end of period	$105,090	$154,851

Segment_Information_Additional

Segment Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 2015
	segment
Segment Reporting [Abstract]
Number of operating segments	5

Segment_Information_Segment_Re

Segment Information - Segment Reporting Information by Segment (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment information
Total Revenues	$749,286	$770,126
Depreciation and Amortization	85,951	86,433
Depreciation	74,791	74,713
Amortization	11,160	11,720
Adjusted OIBDA	231,218	228,524
Total Assets	6,371,454	6,706,617	6,570,342
Expenditures for Segment Assets	90,450	146,795
Capital Expenditures	74,776	107,856
Cash Paid for Acquisitions, Net of Cash Acquired	6,431	30,781
Additions to Customer Relationship and Acquisition Costs	9,243	8,158
North American Records and Information Management business
Segment information
Total Revenues	442,687	446,132
Depreciation and Amortization	45,303	45,506
Depreciation	40,336	40,821
Amortization	4,967	4,685
Adjusted OIBDA	181,480	169,209
Total Assets	3,623,905	3,632,489
Expenditures for Segment Assets	42,375	49,266
Capital Expenditures	33,180	42,561
Cash Paid for Acquisitions, Net of Cash Acquired	600	-916
Additions to Customer Relationship and Acquisition Costs	8,595	7,621
North American Data Management Business
Segment information
Total Revenues	97,235	96,724
Depreciation and Amortization	5,344	5,030
Depreciation	5,284	4,965
Amortization	60	65
Adjusted OIBDA	51,288	54,668
Total Assets	648,507	666,188
Expenditures for Segment Assets	4,949	5,507
Capital Expenditures	4,907	5,507
Cash Paid for Acquisitions, Net of Cash Acquired	-21	0
Additions to Customer Relationship and Acquisition Costs	63	0
Western European Business
Segment information
Total Revenues	100,812	117,131
Depreciation and Amortization	11,439	14,340
Depreciation	9,986	12,014
Amortization	1,453	2,326
Adjusted OIBDA	29,453	34,563
Total Assets	896,380	1,131,454
Expenditures for Segment Assets	7,588	10,787
Capital Expenditures	4,410	9,974
Cash Paid for Acquisitions, Net of Cash Acquired	2,819	296
Additions to Customer Relationship and Acquisition Costs	359	517
Other International Business
Segment information
Total Revenues	103,991	107,299
Depreciation and Amortization	14,265	14,419
Depreciation	9,632	9,775
Amortization	4,633	4,644
Adjusted OIBDA	20,835	24,200
Total Assets	911,481	994,657
Expenditures for Segment Assets	22,548	54,154
Capital Expenditures	19,289	22,733
Cash Paid for Acquisitions, Net of Cash Acquired	3,033	31,401
Additions to Customer Relationship and Acquisition Costs	226	20
Corporate and Other
Segment information
Total Revenues	4,561	2,840
Depreciation and Amortization	9,600	7,138
Depreciation	9,553	7,138
Amortization	47	0
Adjusted OIBDA	-51,838	-54,116
Total Assets	291,181	281,829
Expenditures for Segment Assets	12,990	27,081
Capital Expenditures	12,990	27,081
Cash Paid for Acquisitions, Net of Cash Acquired	0	0
Additions to Customer Relationship and Acquisition Costs	$0	$0

Segment_Information_Reconcilia

Segment Information - Reconciliation to Income Before Provision for Income Taxes (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of Adjusted OIBDA to income from continuing operations before provision (benefit) for income taxes on a consolidated basis
Adjusted OIBDA	$231,218	$228,524
Less: Depreciation and Amortization	85,951	86,433
Loss on disposal/write-down of property, plant and equipment (excluding real estate), net	333	1,152
REIT Costs	0	8,323
Interest Income (Expense), Net	64,898	62,312
Other Expense, Net	22,349	5,317
Income from Continuing Operations Before Provision for Income Taxes and Gain on Sale of Real Estate	$57,687	$64,987

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Nov. 30, 2011	Mar. 31, 2015
	customer	claim
Buenos Aires, Argentina
Commitments and Contingencies
Maximum facility revenue as a percentage of consolidated revenues		0.50%
Insurance Settlement [Member]
Commitments and Contingencies
Reasonably possible additional losses		4,000
Italy Fire
Commitments and Contingencies
Number of customer lawsuits	4
Number of customer lawsuits settled		3

Stockholders_Equity_Matters_De

Stockholders' Equity Matters (Details) (USD $)	0 Months Ended			1 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Nov. 17, 2014	Nov. 04, 2014	Sep. 15, 2014	Nov. 30, 2012	Nov. 04, 2014
Equity [Abstract]
Special distribution declared		$700,000,000	$700,000,000
Special distribution paid				700,000,000
Maximum amount the special distribution can be in cash			140,000,000
Maximum amount the special distribution can be in cash as a percent of the total special distribution			20.00%
Cash portion of special distribution		$140,000,000
Number of trading days used for value of special dividend		3 days
Average closing price on the three trading days following October 24, 2014					$35.55
Common stock issued in special dividend (in shares)		15,750
Catch-Up Dividends per Common Share (in dollars per share)	$0.26

Stockholders_Equity_Matters_Di

Stockholders' Equity Matters - Dividends Declared (Details) (USD $)	0 Months Ended												3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 20, 2015	Feb. 19, 2015	Dec. 22, 2014	Dec. 15, 2014	Nov. 17, 2014	Nov. 04, 2014	Oct. 15, 2014	Sep. 15, 2014	Jul. 15, 2014	28-May-14	Apr. 15, 2014	Mar. 14, 2014	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Dividends Declared per Common Share (in dollars per share)		$0.48			$0.48			$0.48		$0.27		$0.27	$0.47	$0.27
Special Dividends Declared per Common Share (in dollars per share)								$3.61
Catch-Up Dividends per Common Share (in dollars per share)					$0.26
Dividends, Common Stock	$99,795		$99,617				$91,993		$52,033		$51,812		$100,539	$52,290
Special distribution paid						700,000		700,000
Catch Up Distribution, Common Stock				$53,450

Subsequent_Events_Details

Subsequent Events (Details) (Recall, Subsequent event, AUD)	0 Months Ended
	Apr. 28, 2015
Recall | Subsequent event
Subsequent events
Common stock issuable per Recall common share	0.1722
Consideration transferable per Recall common share (per share)	8.5
Consideration transferable cap	225,000,000