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Selected Consolidated Financial Statements of Parent, Guarantors and Non-Guarantors - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidating financial statements
Revenues	$ 1,062,224	$ 1,060,991	$ 3,182,994	$ 3,164,272
Intercompany revenues	0	0	0	0
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	451,317	448,018	1,377,963	1,348,203
Intercompany	0	0	0	0
Selling, general and administrative	239,156	259,929	762,479	789,324
Depreciation and amortization	157,561	157,797	484,375	474,595
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(9,284)	(388)	(17,087)	(2,064)
Total Operating Expenses	838,750	865,356	2,607,730	2,610,058
Operating Income (Loss)	223,474	195,635	575,264	554,214
Interest Expense (Income), Net	106,677	103,938	314,427	303,836
Other (Income) Expense, Net	(13,415)	325	(13,397)	1,420
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	130,212	91,372	274,234	248,958
Provision (Benefit) for Income Taxes	21,928	14,023	43,127	39,957
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0	0	0
Income (Loss) from Continuing Operations	108,284	77,349	231,107	209,001
Income (Loss) from Discontinued Operations, Net of Tax	0	(11,605)	104	(12,427)
Net Income (Loss)	108,284	65,744	231,211	196,574
Less: Net Income (Loss) Attributable to Noncontrolling Interests	609	(125)	1,534	485
Net Income (Loss) Attributable to Iron Mountain Incorporated	107,675	65,869	229,677	196,089
Net Income (Loss)	108,284	65,744	231,211	196,574
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	(83,595)	(24,769)	(71,195)	(132,290)
Change in Fair Value of Derivative Instruments	(1,496)	1,980	(9,101)	4,183
Equity in Other Comprehensive (Loss) Income of Subsidiaries	0	0	0	0
Total Other Comprehensive (Loss) Income	(85,091)	(22,789)	(80,296)	(128,107)
Comprehensive Income (Loss)	23,193	42,955	150,915	68,467
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(100)	(2,104)	1,777	(3,351)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	23,293	45,059	149,138	71,818
Eliminations
Consolidating financial statements
Revenues	(6,804)	(5,522)	(18,579)	(16,739)
Intercompany revenues	(6,804)	(5,522)	(18,579)	(16,739)
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0	0	0
Intercompany	(6,804)	(5,522)	(18,579)	(16,739)
Selling, general and administrative	0	0	0	0
Depreciation and amortization	0	0	0	0
(Gain) Loss on disposal/write-down of property, plant and equipment, net	0	0	0	0
Total Operating Expenses	(6,804)	(5,522)	(18,579)	(16,739)
Operating Income (Loss)	0	0	0	0
Interest Expense (Income), Net	0	0	0	0
Other (Income) Expense, Net	0	0	0	0
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	0	0	0	0
Provision (Benefit) for Income Taxes	0	0	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	205,774	141,290	493,289	402,499
Income (Loss) from Continuing Operations	(205,774)	(141,290)	(493,289)	(402,499)
Income (Loss) from Discontinued Operations, Net of Tax	0	0	0	0
Net Income (Loss)	(205,774)	(141,290)	(493,289)	(402,499)
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated	(205,774)	(141,290)	(493,289)	(402,499)
Net Income (Loss)	(205,774)	(141,290)	(493,289)	(402,499)
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	0	0	0	0
Change in Fair Value of Derivative Instruments	0	0	0	0
Equity in Other Comprehensive (Loss) Income of Subsidiaries	177,122	39,372	159,258	241,182
Total Other Comprehensive (Loss) Income	177,122	39,372	159,258	241,182
Comprehensive Income (Loss)	(28,652)	(101,918)	(334,031)	(161,317)
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(28,652)	(101,918)	(334,031)	(161,317)
Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0	0	0
Intercompany revenues	0	0	0	0
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0	0	0
Intercompany	0	0	0	0
Selling, general and administrative	161	(427)	310	(348)
Depreciation and amortization	23	31	68	96
(Gain) Loss on disposal/write-down of property, plant and equipment, net	0	0	0	0
Total Operating Expenses	184	(396)	378	(252)
Operating Income (Loss)	(184)	396	(378)	252
Interest Expense (Income), Net	52,166	49,964	151,392	150,218
Other (Income) Expense, Net	(596)	439	(55)	2,049
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	(51,754)	(50,007)	(151,715)	(152,015)
Provision (Benefit) for Income Taxes	0	0	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(159,429)	(115,876)	(381,392)	(348,104)
Income (Loss) from Continuing Operations	107,675	65,869	229,677	196,089
Income (Loss) from Discontinued Operations, Net of Tax	0	0	0	0
Net Income (Loss)	107,675	65,869	229,677	196,089
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated	107,675	65,869	229,677	196,089
Net Income (Loss)	107,675	65,869	229,677	196,089
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	13,101	2,139	14,962	6,761
Change in Fair Value of Derivative Instruments	(1,496)	1,980	(9,101)	4,183
Equity in Other Comprehensive (Loss) Income of Subsidiaries	(95,987)	(24,929)	(86,400)	(135,215)
Total Other Comprehensive (Loss) Income	(84,382)	(20,810)	(80,539)	(124,271)
Comprehensive Income (Loss)	23,293	45,059	149,138	71,818
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	23,293	45,059	149,138	71,818
Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	663,724	656,060	1,972,085	1,931,563
Intercompany revenues	1,173	1,192	3,485	3,613
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	262,183	254,068	788,864	753,837
Intercompany	5,631	4,330	15,094	13,126
Selling, general and administrative	162,052	177,777	523,844	531,507
Depreciation and amortization	100,023	100,210	308,284	299,372
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(8,922)	(1,669)	18,436	(2,491)
Total Operating Expenses	520,967	534,716	1,654,522	1,595,351
Operating Income (Loss)	142,757	121,344	317,563	336,212
Interest Expense (Income), Net	6,074	3,151	19,128	4,863
Other (Income) Expense, Net	11,577	4,155	16,636	12,323
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	125,106	114,038	281,799	319,026
Provision (Benefit) for Income Taxes	12,814	9,012	15,268	14,810
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(46,345)	(25,414)	(111,897)	(54,395)
Income (Loss) from Continuing Operations	158,637	130,440	378,428	358,611
Income (Loss) from Discontinued Operations, Net of Tax	0	(11,588)	120	(12,283)
Net Income (Loss)	158,637	118,852	378,548	346,328
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated	158,637	118,852	378,548	346,328
Net Income (Loss)	158,637	118,852	378,548	346,328
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	0	0	0	0
Change in Fair Value of Derivative Instruments	0	0	0	0
Equity in Other Comprehensive (Loss) Income of Subsidiaries	(81,135)	(14,443)	(72,858)	(105,967)
Total Other Comprehensive (Loss) Income	(81,135)	(14,443)	(72,858)	(105,967)
Comprehensive Income (Loss)	77,502	104,409	305,690	240,361
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	77,502	104,409	305,690	240,361
Non- Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	405,304	410,453	1,229,488	1,249,448
Intercompany revenues	5,631	4,330	15,094	13,126
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	189,134	193,950	589,099	594,366
Intercompany	1,173	1,192	3,485	3,613
Selling, general and administrative	76,943	82,579	238,325	258,165
Depreciation and amortization	57,515	57,556	176,023	175,127
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(362)	1,281	(35,523)	427
Total Operating Expenses	324,403	336,558	971,409	1,031,698
Operating Income (Loss)	80,901	73,895	258,079	217,750
Interest Expense (Income), Net	48,437	50,823	143,907	148,755
Other (Income) Expense, Net	(24,396)	(4,269)	(29,978)	(12,952)
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	56,860	27,341	144,150	81,947
Provision (Benefit) for Income Taxes	9,114	5,011	27,859	25,147
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0	0	0
Income (Loss) from Continuing Operations	47,746	22,330	116,291	56,800
Income (Loss) from Discontinued Operations, Net of Tax	0	(17)	(16)	(144)
Net Income (Loss)	47,746	22,313	116,275	56,656
Less: Net Income (Loss) Attributable to Noncontrolling Interests	609	(125)	1,534	485
Net Income (Loss) Attributable to Iron Mountain Incorporated	47,137	22,438	114,741	56,171
Net Income (Loss)	47,746	22,313	116,275	56,656
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	(96,696)	(26,908)	(86,157)	(139,051)
Change in Fair Value of Derivative Instruments	0	0	0	0
Equity in Other Comprehensive (Loss) Income of Subsidiaries	0	0	0	0
Total Other Comprehensive (Loss) Income	(96,696)	(26,908)	(86,157)	(139,051)
Comprehensive Income (Loss)	(48,950)	(4,595)	30,118	(82,395)
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(100)	(2,104)	1,777	(3,351)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(48,850)	(2,491)	28,341	(79,044)
Storage rental
Consolidating financial statements
Revenues	673,318	656,973	2,005,580	1,963,561
Storage rental | Eliminations
Consolidating financial statements
Revenues	0	0	0	0
Storage rental | Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0	0	0
Storage rental | Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	416,967	404,397	1,235,353	1,201,035
Storage rental | Non- Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	256,351	252,576	770,227	762,526
Service
Consolidating financial statements
Revenues	388,906	404,018	1,177,414	1,200,711
Service | Eliminations
Consolidating financial statements
Revenues	0	0	0	0
Service | Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0	0	0
Service | Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	245,584	250,471	733,247	726,915
Service | Non- Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	$ 143,322	$ 153,547	$ 444,167	$ 473,796

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