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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
	Mar. 31, 2018	Mar. 31, 2017
Class of Stock [Line Items]
Net income available to common unitholders	$ 86,298	$ 66,145
Weighted average shares/units outstanding-basic (shares/units)	205,714,173	159,297,027
Potentially dilutive common units:
Stock options (units)	0	4
Unvested incentive units (units)	302,016	237,336
Forward equity offering (units)	0	283,388
Market performance-based awards (units)	491,287	603,900
Weighted average shares/units outstanding-diluted (shares/units)	206,507,476	160,421,655
Income per share:
Basic (in dollars per share/unit)	$ 0.42	$ 0.42
Diluted (in dollars per share/unit)	$ 0.42	$ 0.41
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Net income available to common unitholders	$ 89,778	$ 67,049
Weighted average shares/units outstanding-basic (shares/units)	214,009,460	161,474,901
Potentially dilutive common units:
Stock options (units)	0	4
Unvested incentive units (units)	302,016	237,336
Forward equity offering (units)	0	283,388
Market performance-based awards (units)	491,287	603,900
Weighted average shares/units outstanding-diluted (shares/units)	214,802,763	162,599,529
Income per share:
Basic (in dollars per share/unit)	$ 0.42	$ 0.42
Diluted (in dollars per share/unit)	$ 0.42	$ 0.41

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