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Summary of Significant Accounting Policies - Long Lived Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(Gain) Loss on disposal/write-down of property, plant and equipment, net $ 63,824 $ 73,622 $ 766
Sale and sale-leaseback transactions 67,800    
Loss on disposal/write-down of property, plant and equipment (63,824) (74,134) $ (766)
Iron Mountain Iron Cloud      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on disposal/write-down of property, plant and equipment 25,000    
United Kingdom      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of real estate, net of tax   $ 63,800  
United States      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Write down of property 15,700    
Disposed of by sale | United Kingdom      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of real estate, net of tax $ 36,000