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Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |
Less: Mortgage debt assumed at fair value | $ (293,300)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | $ (969,700)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | $ (271,600)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Shopping Centers Acquired [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Land | 147,559 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 402,289 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Buildings | 399,274 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 1,338,851 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Tenant improvements | 9,625 ddr_BusinessAcquisitionPurchasePriceAllocationTenantImprovements / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 35,334 ddr_BusinessAcquisitionPurchasePriceAllocationTenantImprovements / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Construction in progress | 76,214 ddr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConstructionInProcess / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 0 ddr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConstructionInProcess / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Other assets | 4,402 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 19,536 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Assets acquired | 732,586 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 2,139,370 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Less: Mortgage debt assumed at fair value | (293,288)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | (969,734)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Less: Below-market leases | (28,115)us-gaap_BelowMarketLeaseAcquired / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | (79,499)us-gaap_BelowMarketLeaseAcquired / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Less: Other liabilities assumed | (3,478)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | (26,456)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Net assets acquired | 407,705 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember | 1,063,681 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember |
Shopping Centers Acquired [Member] | In-Place Leases (Including Lease Origination Costs and Fair Market Value of Leases) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired | 59,684 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember | 186,370 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |
Weighted Average Amortization Period | 7 years 1 month 6 days | 5 years 2 months 12 days |
Shopping Centers Acquired [Member] | Tenant Relations [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired | $ 35,828 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddr_TenantRelationsMember | $ 156,990 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = ddr_ShoppingCentersAcquiredMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddr_TenantRelationsMember |
Weighted Average Amortization Period | 7 years 8 months 12 days | 5 years 7 months 6 days |
Shopping Centers Acquired [Member] | Below-Market Leases [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted Average Amortization Period | 19 years 1 month 6 days | 15 years 10 months 24 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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