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Debt of the Operating Partnership (4.750% Notes Due 2023) (Narrative) (Details)
$ in Thousands
12 Months Ended
Apr. 01, 2014
USD ($)
$ / £
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 01, 2014
GBP (£)
$ / £
Unsecured senior notes        
Debt Instrument [Line Items]        
Deferred financing costs, net   $ 25,400 $ 26,000  
Digital Realty Trust, L.P.        
Debt Instrument [Line Items]        
Unamortized discount   15,649    
Digital Realty Trust, L.P. | Unsecured senior notes        
Debt Instrument [Line Items]        
Unamortized discount   15,649 17,914  
Deferred financing costs, net   $ 25,374 $ 26,037  
Digital Realty Trust, L.P. | 4.750% notes due 2023 | Unsecured senior notes        
Debt Instrument [Line Items]        
Debt face amount $ 498,900     £ 300,000,000.0
Interest rate 4.75% 4.75%   4.75%
Unamortized discount $ 3,000      
Deferred financing costs, net 5,000      
Proceeds form debt, net of issuance costs $ 490,900      
Secured debt ratio percentage   40.00%    
Interest coverage ratio   1.50    
Unencumbered assets to unsecured debt   150.00%    
Digital Realty Trust, L.P. | 4.750% notes due 2023 | British pound sterling (£) | Unsecured senior notes        
Debt Instrument [Line Items]        
Derivative forward exchange rate (in dollars per share) | $ / £ 1.66     1.66
Digital Realty Trust, L.P. | 4.750% notes due 2023 | Maximum | Unsecured senior notes        
Debt Instrument [Line Items]        
Leverage ratio   60.00%