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Divestments - Additional Information (Details) $ in Thousands, $ in Thousands		3 Months Ended	12 Months Ended
	May 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 28, 2018 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 AUD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposition			$ 0	$ 0	$ 16,838
Gain on divestiture			0	38,869	0
Fair value of previously held equity interests			$ 0	18,000	0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Australia Divestment Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposition					15,417
Divestiture cash consideration received							$ 53,200	$ 70,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Iron Mountain Canadian Divestments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposition					$ 1,421
Disposal Group, Disposed of by Sale, Not Discontinued Operations | IMFS
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture cash consideration received						$ 3,000
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest after disposal	25.00%
Gain on divestiture		$ 38,869		38,869
Cumulative translation adjustment	$ 29,100			$ 29,100
Carrying value of net assets excluding goodwill	4,716
Goodwill	3,515
Other Assets | Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair value of previously held equity interests	18,000
Equity method investments	$ 20,869

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