CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 30,452	$ 45,152
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	18,191	31,651
Change in Fair Value of Interest Rate Swap Agreements	(2,674)	(185)
Total Other Comprehensive Income (Loss)	15,517	31,466
Comprehensive Income (Loss)	45,969	76,618
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	1,704	2,027
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 44,265	$ 74,591