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Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidating financial statements
Revenues	$ 1,060,991	$ 965,661	$ 3,164,272	$ 2,854,343
Intercompany	0	0	0	0
Cost of sales (excluding depreciation and amortization) and Selling, general and administrative	706,488	660,684	2,126,729	1,979,286
Intercompany	0	0	0	0
Income (loss) from discontinued operations, net of tax	(11,605)	(1,058)	(12,427)	(3,421)
Operating Expenses:
Selling, General and Administrative	258,470	242,357	778,526	719,968
Depreciation and Amortization	157,797	128,513	474,595	381,319
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	960	(292)	(716)	(967)
Total Operating Expenses	865,245	788,905	2,600,608	2,359,638
Operating Income (Loss)	195,746	176,756	563,664	494,705
Interest Expense (Income), Net	103,841	88,989	303,574	265,010
Other (Income) Expense, Net	325	59,479	1,420	33,749
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes and Gain on Sale of Real Estate	91,580	28,288	258,670	195,946
Provision (Benefit) for Income Taxes	14,300	2,268	41,873	29,497
Gain on Sale of Real Estate, Net of Tax	(1,348)	638	(1,348)	(925)
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0	0	0
Income (Loss) from Continuing Operations	78,628	25,382	218,145	167,374
Net income (loss)	67,023	24,324	205,718	163,953
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(125)	(21)	485	2,853
Net income (loss) attributable to Iron Mountain Incorporated	67,148	24,345	205,233	161,100
Net income (loss)	67,023	24,324	205,718	163,953
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	(24,769)	37,541	(132,290)	95,863
Change in Fair Value of Interest Rate Swap Agreements	1,980	0	4,183	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0	0	0
Total Other Comprehensive Income (Loss)	(22,789)	37,541	(128,107)	95,863
Comprehensive Income (Loss)	44,234	61,865	77,611	259,816
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(2,104)	(727)	(3,351)	1,486
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	46,338	62,592	80,962	258,330
Eliminations
Consolidating financial statements
Revenues	(5,522)	(6,169)	(16,739)	(21,603)
Intercompany	(5,522)	(6,169)	(16,739)	(21,603)
Cost of sales (excluding depreciation and amortization) and Selling, general and administrative	0	0	0	0
Intercompany	(5,522)	(6,169)	(16,739)	(21,603)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Operating Expenses:
Depreciation and Amortization	0	0	0	0
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	0	0	0
Total Operating Expenses	(5,522)	(6,169)	(16,739)	(21,603)
Operating Income (Loss)	0	0	0	0
Interest Expense (Income), Net	0	0	0	0
Other (Income) Expense, Net	0	0	0	0
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes and Gain on Sale of Real Estate	0	0	0	0
Provision (Benefit) for Income Taxes	0	0	0	0
Gain on Sale of Real Estate, Net of Tax	0	0	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	143,848	124,833	420,787	398,985
Income (Loss) from Continuing Operations	(143,848)	(124,833)	(420,787)	(398,985)
Net income (loss)	(143,848)	(124,833)	(420,787)	(398,985)
Less: Net (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Net income (loss) attributable to Iron Mountain Incorporated	(143,848)	(124,833)	(420,787)	(398,985)
Net income (loss)	(143,848)	(124,833)	(420,787)	(398,985)
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	0	0	0	0
Change in Fair Value of Interest Rate Swap Agreements	0		0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	39,372	(73,262)	241,182	(180,146)
Total Other Comprehensive Income (Loss)	39,372	(73,262)	241,182	(180,146)
Comprehensive Income (Loss)	(104,476)	(198,095)	(179,605)	(579,131)
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(104,476)	(198,095)	(179,605)	(579,131)
Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0	0	0
Intercompany	0	0	0	0
Cost of sales (excluding depreciation and amortization) and Selling, general and administrative	(427)	(203)	(348)	149
Intercompany	0	0	0	0
Income (loss) from discontinued operations, net of tax	0	0	0	0
Operating Expenses:
Depreciation and Amortization	31	45	96	134
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	0	0	0
Total Operating Expenses	(396)	(158)	(252)	283
Operating Income (Loss)	396	158	252	(283)
Interest Expense (Income), Net	49,964	41,369	150,218	124,530
Other (Income) Expense, Net	439	43,258	2,049	43,678
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes and Gain on Sale of Real Estate	(50,007)	(84,469)	(152,015)	(168,491)
Provision (Benefit) for Income Taxes	0	0	0	0
Gain on Sale of Real Estate, Net of Tax	0	0	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(117,155)	(108,814)	(357,248)	(329,591)
Income (Loss) from Continuing Operations	67,148	24,345	205,233	161,100
Net income (loss)	67,148	24,345	205,233	161,100
Less: Net (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Net income (loss) attributable to Iron Mountain Incorporated	67,148	24,345	205,233	161,100
Net income (loss)	67,148	24,345	205,233	161,100
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	2,139	(4,211)	6,761	(12,359)
Change in Fair Value of Interest Rate Swap Agreements	1,980		4,183
Equity in Other Comprehensive Income (Loss) of Subsidiaries	(24,929)	42,458	(135,215)	109,589
Total Other Comprehensive Income (Loss)	(20,810)	38,247	(124,271)	97,230
Comprehensive Income (Loss)	46,338	62,592	80,962	258,330
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	46,338	62,592	80,962	258,330
Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	653,614	574,274	1,924,593	1,718,283
Intercompany	1,192	1,148	3,613	3,386
Cost of sales (excluding depreciation and amortization) and Selling, general and administrative	430,179	391,847	1,280,789	1,183,560
Intercompany	4,330	5,021	13,126	18,217
Income (loss) from discontinued operations, net of tax	(11,588)	(678)	(12,283)	(1,635)
Operating Expenses:
Depreciation and Amortization	99,949	74,470	298,565	225,760
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	(321)	(385)	(1,139)	(1,179)
Total Operating Expenses	534,137	470,953	1,591,341	1,426,358
Operating Income (Loss)	119,477	103,321	333,252	291,925
Interest Expense (Income), Net	3,041	(1,705)	4,538	10,653
Other (Income) Expense, Net	3,792	5,547	11,927	8,609
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes and Gain on Sale of Real Estate	112,644	99,479	316,787	272,663
Provision (Benefit) for Income Taxes	8,287	6,138	14,084	19,318
Gain on Sale of Real Estate, Net of Tax	(1,348)	0	(1,348)	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(26,693)	(16,019)	(63,539)	(69,394)
Income (Loss) from Continuing Operations	132,398	109,360	367,590	322,739
Net income (loss)	120,810	108,682	355,307	321,104
Less: Net (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Net income (loss) attributable to Iron Mountain Incorporated	120,810	108,682	355,307	321,104
Net income (loss)	120,810	108,682	355,307	321,104
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	0	0	0	0
Change in Fair Value of Interest Rate Swap Agreements	0		0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	(14,443)	30,804	(105,967)	70,557
Total Other Comprehensive Income (Loss)	(14,443)	30,804	(105,967)	70,557
Comprehensive Income (Loss)	106,367	139,486	249,340	391,661
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0		0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	106,367	139,486	249,340	391,661
Non-Guarantor Subsidiaries including Canada Company [Member] | Reportable legal entities
Consolidating financial statements
Revenues	412,899	397,556	1,256,418	1,157,663
Intercompany	4,330	5,021	13,126	18,217
Cost of sales (excluding depreciation and amortization) and Selling, general and administrative	276,736	269,040	846,288	795,577
Intercompany	1,192	1,148	3,613	3,386
Income (loss) from discontinued operations, net of tax	(17)	(380)	(144)	(1,786)
Operating Expenses:
Depreciation and Amortization	57,817	53,998	175,934	155,425
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	1,281	93	423	212
Total Operating Expenses	337,026	324,279	1,026,258	954,600
Operating Income (Loss)	75,873	73,277	230,160	203,063
Interest Expense (Income), Net	50,836	49,325	148,818	129,827
Other (Income) Expense, Net	(3,906)	10,674	(12,556)	(18,538)
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes and Gain on Sale of Real Estate	28,943	13,278	93,898	91,774
Provision (Benefit) for Income Taxes	6,013	(3,870)	27,789	10,179
Gain on Sale of Real Estate, Net of Tax	0	638	0	(925)
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0	0	0
Income (Loss) from Continuing Operations	22,930	16,510	66,109	82,520
Net income (loss)	22,913	16,130	65,965	80,734
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(125)	(21)	485	2,853
Net income (loss) attributable to Iron Mountain Incorporated	23,038	16,151	65,480	77,881
Net income (loss)	22,913	16,130	65,965	80,734
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	(26,908)	41,752	(139,051)	108,222
Change in Fair Value of Interest Rate Swap Agreements	0		0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0	0	0
Total Other Comprehensive Income (Loss)	(26,908)	41,752	(139,051)	108,222
Comprehensive Income (Loss)	(3,995)	57,882	(73,086)	188,956
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(2,104)	(727)	(3,351)	1,486
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(1,891)	58,609	(69,735)	187,470
Storage Rental And Service [Member]
Consolidating financial statements
Revenues	1,060,991	965,661	3,164,272	2,854,343
Storage Rental And Service [Member] | Eliminations
Consolidating financial statements
Revenues	0	0	0	0
Storage Rental And Service [Member] | Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0	0	0
Storage Rental And Service [Member] | Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	652,422	573,126	1,920,980	1,714,897
Storage Rental And Service [Member] | Non-Guarantor Subsidiaries including Canada Company [Member] | Reportable legal entities
Consolidating financial statements
Revenues	$ 408,569	$ 392,535	$ 1,243,292	$ 1,139,446

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