CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 152,254	$ 183,666	$ 187,263
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	210,750	(195,368)	80,657
Change in fair value of derivative instruments	(7,518)	(1,767)	(2,454)
Reclassifications from Accumulated Other Comprehensive Items, net	(1,618)	(2,528)	(7,580)
Total Other Comprehensive Income (Loss)	201,614	(199,663)	70,623
Comprehensive Income (Loss)	353,868	(15,997)	257,886
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	8,333	2,643	2,805
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 345,535	$ (18,640)	$ 255,081