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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 158,831	$ 67,023	$ 93,543	$ 45,152	$ 21,479	$ 24,324	$ 81,122	$ 58,507	$ 364,549	$ 185,432	$ 107,233
Other Comprehensive (Loss) Income:
Foreign Currency Translation Adjustment									(164,107)	108,564	(35,641)
Market Value Adjustments for Securities									0	0	(734)
Change in Fair Value of Interest Rate Swap Agreements									(973)	0	0
Total Other Comprehensive (Loss) Income									(165,080)	108,564	(36,375)
Comprehensive Income (Loss)									199,469	293,996	70,858
Comprehensive Income (Loss) Attributable to Noncontrolling Interests									(2,207)	1,591	3,690
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated									$ 201,676	$ 292,405	$ 67,168