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Summary of Significant Accounting Policies - Other Expense (Income), Net (including Foreign Currency) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Foreign currency transaction losses (gains), net |  | $ (15,567) | $ 43,248 | $ 20,413
Debt extinguishment expense, net |  | 0 | 78,368 | 9,283
Other, net |  | 3,875 | (42,187) | 14,604
Other (Income) Expense, Net |  | (11,692) | 79,429 | 44,300
Loss on disposition |  | 0 | 0 | 16,838
Gain on divestiture |  | $ 0 | 38,869 | 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
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, Not Discontinued Operations | Russia and Ukraine Divestment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on divestiture | $ 38,869 |  | $ 38,869 |

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