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Income per Unit (Summary of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]                      
Net income available to common unitholders $ 53,306 $ (4,140) $ 57,837 $ 66,145 $ 77,682 $ 187,330 $ 27,951 $ 39,125 $ 173,148 $ 332,088 $ 217,266
Weighted average units outstanding—basic (in shares)                 174,059,386 149,953,662 138,247,606
Potentially dilutive common units:                      
Stock options (in shares)                 0 9,726 20,424
Unvested incentive units (in shares)                 141,136 71,031 95,746
Forward equity offering (in units)                 124,527 3,990 0
Market performance-based awards (in shares)                 570,049 641,279 501,645
Weighted average units outstanding—diluted (in shares)                 174,895,098 150,679,688 138,865,421
Income per unit:                      
Basic (in dollars per share) $ 0.26 $ (0.02) $ 0.36 $ 0.42 $ 0.49 $ 1.27 $ 0.19 $ 0.27 $ 0.99 $ 2.21 $ 1.57
Diluted (in dollars per share) $ 0.26 $ (0.02) $ 0.36 $ 0.41 $ 0.49 $ 1.25 $ 0.19 $ 0.27 $ 0.99 $ 2.20 $ 1.56
Digital Realty Trust, L.P.                      
Class of Stock [Line Items]                      
Net income available to common unitholders $ 55,444 $ (4,219) $ 58,644 $ 67,049 $ 78,836 $ 190,354 $ 28,408 $ 39,788 $ 176,918 $ 337,386 $ 220,343
Weighted average units outstanding—basic (in shares)                 178,055,936 152,359,680 140,905,897
Potentially dilutive common units:                      
Stock options (in shares)                 0 9,726 20,424
Unvested incentive units (in shares)                 141,136 71,031 95,746
Forward equity offering (in units)                 124,527 3,990 0
Market performance-based awards (in shares)                 570,049 641,279 501,645
Weighted average units outstanding—diluted (in shares)                 178,891,648 153,085,706 141,523,712
Income per unit:                      
Basic (in dollars per share) $ 0.26 $ (0.02) $ 0.36 $ 0.42 $ 0.49 $ 1.27 $ 0.19 $ 0.27 $ 0.99 $ 2.21 $ 1.56
Diluted (in dollars per share) $ 0.26 $ (0.02) $ 0.36 $ 0.41 $ 0.49 $ 1.25 $ 0.19 $ 0.27 $ 0.99 $ 2.20 $ 1.55