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Merger and Portfolio Acquisition (DFT Merger) (Details)
$ in Thousands, € in Millions
9 Months Ended 12 Months Ended
Sep. 14, 2017
USD ($)
Aug. 01, 2016
USD ($)
Aug. 01, 2016
EUR (€)
Jul. 05, 2016
USD ($)
Sep. 29, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]              
Land           $ 87,610  
Goodwill           3,389,595 $ 752,970
DFT Company              
Business Acquisition [Line Items]              
Land $ 312,579            
Buildings and improvements 3,677,497            
Cash and cash equivalents 20,650            
Accounts and other receivables 10,978            
Goodwill 2,592,181         $ 2,592,146 0
Acquired below-market leases (185,543)            
Accounts payable and other accrued liabilities (248,259)            
Other working capital, net (22,640)            
Total consideration of assets and liabilities acquired 6,209,633            
Equinix              
Business Acquisition [Line Items]              
Total consideration of assets and liabilities acquired   $ 212,000 € 190 $ 818,900      
Above Market Leases              
Business Acquisition [Line Items]              
Weighted average remaining intangible amortization life (in months)           65 months  
Above Market Leases | DFT Company              
Business Acquisition [Line Items]              
Acquired above-market leases $ 162,333            
Weighted average remaining intangible amortization life (in months) 47 months            
Customer-Related Intangible Assets | DFT Company              
Business Acquisition [Line Items]              
Acquired above-market leases $ 980,267            
Weighted average remaining intangible amortization life (in months) 220 months            
Customer-Related Intangible Assets | Equinix              
Business Acquisition [Line Items]              
Acquired above-market leases       249,070      
Goodwill       442,975      
Acquired In-Place Lease Value              
Business Acquisition [Line Items]              
Weighted average remaining intangible amortization life (in months)           81 months  
Acquired In-Place Lease Value | DFT Company              
Business Acquisition [Line Items]              
Acquired above-market leases $ 557,128            
Weighted average remaining intangible amortization life (in months) 70 months            
Acquired In-Place Lease Value | Equinix              
Business Acquisition [Line Items]              
Acquired above-market leases       $ 18,807      
Tenant Origination Costs | DFT Company              
Business Acquisition [Line Items]              
Acquired above-market leases $ 44,990            
Weighted average remaining intangible amortization life (in months) 80 months            
Off-Market Favorable Lease              
Business Acquisition [Line Items]              
Weighted average remaining intangible amortization life (in months)           80 months  
Off-Market Favorable Lease | DFT Company              
Business Acquisition [Line Items]              
Weighted average remaining intangible amortization life (in months) 137 months            
Global revolving credit facility | DFT Company              
Business Acquisition [Line Items]              
Long term debt $ (450,697)            
Unsecured Debt | DFT Company              
Business Acquisition [Line Items]              
Long term debt (250,000)            
Senior notes | DFT Company              
Business Acquisition [Line Items]              
Long term debt (886,831)            
Debt paid off at closing of merger         $ 621,000    
Mortgage loans | DFT Company              
Business Acquisition [Line Items]              
Long term debt (105,000)            
Digital Realty Trust, L.P.              
Business Acquisition [Line Items]              
Goodwill           $ 3,389,595 $ 752,970
Digital Realty Trust, L.P. | DFT Company              
Business Acquisition [Line Items]              
Land 312,579            
Buildings and improvements 3,677,497            
Cash and cash equivalents 20,650            
Accounts and other receivables 10,978            
Goodwill 2,592,181            
Acquired below-market leases (185,543)            
Accounts payable and other accrued liabilities (248,259)            
Other working capital, net (22,640)            
Digital Realty Trust, L.P. | Above Market Leases | DFT Company              
Business Acquisition [Line Items]              
Acquired above-market leases 162,333            
Digital Realty Trust, L.P. | Senior notes | DFT Company              
Business Acquisition [Line Items]              
Long term debt (886,831)            
Digital Realty Trust, L.P. | Mortgage loans | DFT Company              
Business Acquisition [Line Items]              
Long term debt $ (105,000)