Summary of Significant Accounting Policies (Basic and Diluted Income) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ 47,755	$ 112,014	$ 109,067	$ 43,307	$ 24,252	$ 76,434	$ 449,380	$ 65,244	$ 312,143	$ 615,310	$ 204,893
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(2,356)	(3,081)	(2,588)
Net Income Loss Attributable To Common Stockholders Basic									309,787	612,229	202,305
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted									2,356	3,081	0
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable									3,089	6,404	2,627
Net Income (Loss) Available to Common Stockholders, Diluted									$ 315,232	$ 621,714	$ 204,932
Weighted Average Number of Shares Outstanding, Basic	354,711	351,856	347,464	345,665	345,267	345,256	345,098	344,597	349,942	345,057	335,777
Weighted Average Limited Partnership Units Outstanding, Basic									3,481	3,582	4,308
Weighted Average Number Diluted Shares Outstanding Adjustment									3,653	3,558	361
Weighted Average Number of Shares Outstanding, Diluted	359,024	358,981	354,433	349,674	349,532	352,150	349,161	348,653	357,076	352,197	340,446
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ 48,174	$ 113,145	$ 110,168	$ 43,745	$ 24,444	$ 77,185	$ 454,142	$ 65,943	$ 315,232	$ 621,714	$ 207,520
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(2,356)	(3,081)	(2,588)
Net Income Loss Attributable To Common Unitholders Basic									312,876	618,633	204,932
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted									2,356	3,081	0
Diluted Net Income Loss Attributable To Common Unitholders									$ 315,232	$ 621,714	$ 204,932
Weighted Average Number of Shares Outstanding, Basic	358,135	355,351	350,968	349,163	348,769	348,760	348,728	348,292	353,423	348,639	340,085
Weighted Average Number Diluted Shares Outstanding Adjustment									3,653	3,558	361
Weighted Average Number of Shares Outstanding, Diluted	359,024	358,981	354,433	349,674	349,532	352,150	349,161	348,653	357,076	352,197	340,446