Discontinued Operations and Assets Held for Sale (Aggregate Balance Sheet of Properties Held for Sale Included in Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 buildings	Dec. 31, 2013
Discontinued Operations
Discontinued Operation, Number of Real Estate Properties Held for Sale	1	11
Continuing Operations, Number of In-service Properties Held for Sale	1
Land and Land Improvements Held-for-Sale	$ 26,614dre_LandandLandImprovementsHeldforSale	$ 8,603dre_LandandLandImprovementsHeldforSale
Buildings and Tenant Improvements Held-for-Sale	47,782	53,324
Inventory, Land Held-for-sale	12,443us-gaap_InventoryLandHeldForSale	0us-gaap_InventoryLandHeldForSale
Accumulated Depreciation of Assets Held-for-Sale	(24,552)	(14,351)
Lease Related Assets, Held for Sale	7,642dre_LeaseRelatedAssetsHeldforSale	6,435dre_LeaseRelatedAssetsHeldforSale
Other assets	1,596	3,455
Total assets held-for-sale	71,525	57,466
Accrued expenses	428	1,481
Other liabilities	575	594
Total liabilities held-for-sale	$ 1,003	$ 2,075

Accumulated Depreciation of Assets Held-for-Sale

No definition available.

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- Definition

Buildings and Tenant Improvements Held-for-Sale

+ References

No definition available.

+ Details

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- Definition

Continuing Operations, Number of In-service Properties Held for Sale

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Total number of real estate properties, classified as held for sale at most recent balance sheet date, classified within discontinued operations

+ References

No definition available.

+ Details

Name:	dre_DiscontinuedOperationNumberOfRealEstatePropertiesHeldForSale
Namespace Prefix:	dre_
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- Definition

Land and Land Improvements Held-for-Sale

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

This element represents the following, for assets held for sale, all net of accumulated amortization: (i) the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property; (ii) costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that result directly from and are essential to acquire that lease and would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction; (iii) the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

+ References

+ Details

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Period Type:	instant

- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying value of obligations incurred and payable pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include interest, rent, salaries, and utilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified.

+ References

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- Definition

For the disposal group, including a component of the entity (discontinued operation), obligations not otherwise itemized.

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- Definition

Carrying amount as of the balance sheet date of parcels of land held for sale, and on which the entity has no intention or no further intention to perform construction activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

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