CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 68,111	$ 38,562	$ 391,264	$ 96,341
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment	(91,263)	44,883	(115,075)	(109,742)
Change in Fair Value of Derivative Instruments	14,665	(184)	35,505	(11,507)
Total Other Comprehensive (Loss) Income	(76,598)	44,699	(79,570)	(121,249)
Comprehensive (Loss) Income	(8,487)	83,261	311,694	(24,908)
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(370)	522	1,683	406
Comprehensive (Loss) Income Attributable to Iron Mountain Incorporated	$ (8,117)	$ 82,739	$ 310,011	$ (25,314)