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Selected Consolidated Financial Statements of Parent, Guarantors and Non-Guarantors - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidating financial statements
Revenues	$ 1,066,907	$ 1,060,823	$ 2,120,770	$ 2,103,281
Intercompany	0	0	0	0
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	465,102	451,464	926,646	900,185
Intercompany	0	0	0	0
Selling, general and administrative	252,764	252,225	523,323	529,395
Depreciation and amortization	164,331	156,220	326,814	316,798
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(8,405)	(546)	(7,803)	(1,676)
Total Operating Expenses	873,792	859,363	1,768,980	1,744,702
Operating Income (Loss)	193,115	201,460	351,790	358,579
Interest Expense (Income), Net	105,314	102,196	207,750	199,898
Other Expense (Income), Net	(15,192)	(19,056)	18	1,095
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	102,993	118,320	144,022	157,586
Provision (Benefit) for Income Taxes	10,646	26,057	21,199	25,934
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0	0	0
Income (Loss) from Continuing Operations	92,347	92,263	122,823	131,652
Income (Loss) from Discontinued Operations, Net of Tax	128	(360)	104	(822)
Net Income (Loss)	92,475	91,903	122,927	130,830
Less: Net Income (Loss) Attributable to Noncontrolling Interests	34	142	925	610
Net income (loss) attributable to Iron Mountain Incorporated	92,441	91,761	122,002	130,220
Net income (loss)	92,475	91,903	122,927	130,830
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	(5,791)	(139,172)	12,400	(107,521)
Change in Fair Value of Interest Rate Swap Agreements	(4,931)	2,388	(7,605)	2,203
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0	0	0
Total Other Comprehensive (Loss) Income	(10,722)	(136,784)	4,795	(105,318)
Comprehensive Income (Loss)	81,753	(44,881)	127,722	25,512
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	173	(3,274)	1,877	(1,247)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	81,580	(41,607)	125,845	26,759
Eliminations
Consolidating financial statements
Revenues	(5,698)	(5,521)	(11,775)	(11,217)
Intercompany	(5,698)	(5,521)	(11,775)	(11,217)
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0	0	0
Intercompany	(5,698)	(5,521)	(11,775)	(11,217)
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	(5,698)	(5,521)	(11,775)	(11,217)
Operating Income (Loss)	0	0	0	0
Interest Expense (Income), Net	0	0	0	0
Other Expense (Income), 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	212,195	182,980	287,515	261,209
Income (Loss) from Continuing Operations	(212,195)	(182,980)	(287,515)	(261,209)
Income (Loss) from Discontinued Operations, Net of Tax	0	0	0	0
Net Income (Loss)	(212,195)	(182,980)	(287,515)	(261,209)
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Net income (loss) attributable to Iron Mountain Incorporated	(212,195)	(182,980)	(287,515)	(261,209)
Net income (loss)	(212,195)	(182,980)	(287,515)	(261,209)
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	0	0	0	0
Change in Fair Value of Interest Rate Swap Agreements	0	0	0	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	529	275,878	(17,864)	201,810
Total Other Comprehensive (Loss) Income	529	275,878	(17,864)	201,810
Comprehensive Income (Loss)	(211,666)	92,898	(305,379)	(59,399)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(211,666)	92,898	(305,379)	(59,399)
Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0	0	0
Intercompany	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	62	36	149	79
Depreciation and amortization	22	32	45	65
(Gain) Loss on disposal/write-down of property, plant and equipment, net	0	0	0	0
Total Operating Expenses	84	68	194	144
Operating Income (Loss)	(84)	(68)	(194)	(144)
Interest Expense (Income), Net	49,601	50,313	99,226	100,254
Other Expense (Income), Net	359	2,767	541	1,610
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	(50,044)	(53,148)	(99,961)	(102,008)
Provision (Benefit) for Income Taxes	0	0	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(142,485)	(144,909)	(221,963)	(232,228)
Income (Loss) from Continuing Operations	92,441	91,761	122,002	130,220
Income (Loss) from Discontinued Operations, Net of Tax	0	0	0	0
Net Income (Loss)	92,441	91,761	122,002	130,220
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Net income (loss) attributable to Iron Mountain Incorporated	92,441	91,761	122,002	130,220
Net income (loss)	92,441	91,761	122,002	130,220
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	(4,280)	10,257	1,861	4,622
Change in Fair Value of Interest Rate Swap Agreements	(4,931)	2,388	(7,605)	2,203
Equity in Other Comprehensive Income (Loss) of Subsidiaries	(1,650)	(146,018)	9,587	(110,286)
Total Other Comprehensive (Loss) Income	(10,861)	(133,373)	3,843	(103,461)
Comprehensive Income (Loss)	81,580	(41,612)	125,845	26,759
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	81,580	(41,612)	125,845	26,759
Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	658,407	643,068	1,302,995	1,270,979
Intercompany	1,158	1,216	2,312	2,421
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	260,675	251,360	523,812	497,523
Intercompany	4,540	4,305	9,463	8,796
Selling, general and administrative	173,443	167,739	361,265	353,087
Depreciation and amortization	104,594	96,170	207,548	198,616
(Gain) Loss on disposal/write-down of property, plant and equipment, net	26,786	(462)	27,360	(818)
Total Operating Expenses	570,038	519,112	1,129,448	1,057,204
Operating Income (Loss)	88,369	123,956	173,547	213,775
Interest Expense (Income), Net	8,640	3,005	12,697	1,497
Other Expense (Income), Net	4,487	6,575	5,014	8,135
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	75,242	114,376	155,836	204,143
Provision (Benefit) for Income Taxes	1,153	12,509	2,454	5,797
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(69,710)	(38,071)	(65,552)	(28,981)
Income (Loss) from Continuing Operations	143,799	139,938	218,934	227,327
Income (Loss) from Discontinued Operations, Net of Tax	144	(273)	120	(695)
Net Income (Loss)	143,943	139,665	219,054	226,632
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Net income (loss) attributable to Iron Mountain Incorporated	143,943	139,665	219,054	226,632
Net income (loss)	143,943	139,665	219,054	226,632
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	0	0	0	0
Change in Fair Value of Interest Rate Swap Agreements	0	0	0	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	1,121	(129,860)	8,277	(91,524)
Total Other Comprehensive (Loss) Income	1,121	(129,860)	8,277	(91,524)
Comprehensive Income (Loss)	145,064	9,805	227,331	135,108
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	145,064	9,805	227,331	135,108
Non- Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	414,198	423,276	829,550	843,519
Intercompany	4,540	4,305	9,463	8,796
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	204,427	200,104	402,834	402,662
Intercompany	1,158	1,216	2,312	2,421
Selling, general and administrative	79,259	84,450	161,909	176,229
Depreciation and amortization	59,715	60,018	119,221	118,117
(Gain) Loss on disposal/write-down of property, plant and equipment, net	(35,191)	(84)	(35,163)	(858)
Total Operating Expenses	309,368	345,704	651,113	698,571
Operating Income (Loss)	104,830	77,572	178,437	144,948
Interest Expense (Income), Net	47,073	48,878	95,827	98,147
Other Expense (Income), Net	(20,038)	(28,398)	(5,537)	(8,650)
(Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes	77,795	57,092	88,147	55,451
Provision (Benefit) for Income Taxes	9,493	13,548	18,745	20,137
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0	0	0
Income (Loss) from Continuing Operations	68,302	43,544	69,402	35,314
Income (Loss) from Discontinued Operations, Net of Tax	(16)	(87)	(16)	(127)
Net Income (Loss)	68,286	43,457	69,386	35,187
Less: Net Income (Loss) Attributable to Noncontrolling Interests	34	142	925	610
Net income (loss) attributable to Iron Mountain Incorporated	68,252	43,315	68,461	34,577
Net income (loss)	68,286	43,457	69,386	35,187
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	(1,511)	(149,429)	10,539	(112,143)
Change in Fair Value of Interest Rate Swap Agreements	0	0	0	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0	0	0
Total Other Comprehensive (Loss) Income	(1,511)	(149,429)	10,539	(112,143)
Comprehensive Income (Loss)	66,775	(105,972)	79,925	(76,956)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	173	(3,274)	1,877	(1,247)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	66,602	(102,698)	78,048	(75,709)
Storage rental
Consolidating financial statements
Revenues	669,288	655,439	1,332,262	1,306,588
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	411,159	397,449	814,900	793,925
Storage rental | Non- Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	258,129	257,990	517,362	512,663
Service
Consolidating financial statements
Revenues	397,619	405,384	788,508	796,693
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	246,090	244,403	485,783	474,633
Service | Non- Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	$ 151,529	$ 160,981	$ 302,725	$ 322,060

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