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Debt of the Operating Partnership (4.25% Notes Due 2025) (Narrative) (Details)
$ in Thousands
12 Months Ended
Jan. 18, 2013
USD ($)
$ / £
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 18, 2013
GBP (£)
$ / £
Debt Instrument [Line Items]          
Borrowings of unsecured senior notes   $ 0 $ 0 $ 264,690  
Digital Realty Trust, L.P.          
Debt Instrument [Line Items]          
Unamortized discount   17,914      
Borrowings of unsecured senior notes   $ 0 0 $ 264,690  
Digital Realty Trust, L.P. | 4.25% notes due 2025          
Debt Instrument [Line Items]          
Debt face amount $ 634,800       £ 400,000,000
Exchange rate (in usd per gbp) | $ / £ 1.59       1.59
Interest rate (as a percent) 4.25%       4.25%
Unamortized discount $ 4,800        
Debt issuance cost 5,800        
Borrowings of unsecured senior notes $ 624,200        
Leverage ratio percentage   60.00%      
Secured debt ratio percentage   40.00%      
Interest coverage ratio   1.50      
Unencumbered assets to unsecured debt (as a percent)   150.00%      
Senior Notes | 4.25% notes due 2025          
Debt Instrument [Line Items]          
Interest rate (as a percent)   4.25%      
Senior Notes | Digital Realty Trust, L.P.          
Debt Instrument [Line Items]          
Unamortized discount   $ 17,914 $ 15,632    
Senior Notes | Digital Realty Trust, L.P. | 4.25% notes due 2025          
Debt Instrument [Line Items]          
Interest rate (as a percent)   4.25%