Summary of Significant Accounting Policies (Basic and Diluted Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ (3,011)	$ 61,533	$ 127,688	$ 18,683	$ 69,574	$ (6,067)	$ 61,494	$ 28,043	$ 204,893	$ 153,044	$ (126,145)
Participating Securities, Distributed and Undistributed Earnings									(2,588)	(2,678)	(3,075)
Net Income Loss Attributable To Common Stockholders Basic									202,305	150,366	(129,220)
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable									2,627	2,094	0
Net Income (Loss) Available to Common Stockholders, Diluted									204,932	152,460	(129,220)
Weighted Average Number of Shares Outstanding, Basic	342,853	341,165	331,753	327,106	326,059	324,895	322,489	314,936	335,777	322,133	267,900
Weighted Average Limited Partnership Units Outstanding, Basic									4,308	4,392	0
Weighted Average Number Diluted Shares Outstanding Adjustment									361	187	0
Weighted Average Number of Shares Outstanding, Diluted	342,853	345,826	336,414	331,716	330,834	324,895	327,098	319,571	340,446	326,712	267,900
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	(3,122)	62,328	129,381	18,933	70,526	(6,159)	62,336	28,435	207,520	155,138	(128,418)
Participating Securities, Distributed and Undistributed Earnings									(2,588)	(2,678)	(3,075)
Net Income Loss Attributable To Common Stockholders Basic									$ 204,932	$ 152,460	$ (131,493)
Weighted Average Number of Shares Outstanding, Basic	346,934	345,545	336,139	331,493	330,446	329,283	326,877	319,341	340,085	326,525	272,729
Weighted Average Number Diluted Shares Outstanding Adjustment									361	187	0
Weighted Average Number of Shares Outstanding, Diluted	346,934	345,826	336,414	331,716	330,834	329,283	327,098	319,571	340,446	326,712	272,729