CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 276,522	$ (7,113)	$ 323,153	$ 57,779
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	42,543	69,027	(23,812)	(154,625)
Change in Fair Value of Derivative Instruments	5,634	(2,961)	20,840	(11,323)
Total Other Comprehensive Income (Loss)	48,177	66,066	(2,972)	(165,948)
Comprehensive Income (Loss)	324,699	58,953	320,181	(108,169)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	1,156	314	2,053	(116)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 323,543	$ 58,639	$ 318,128	$ (108,053)