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Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation And Qualifying Accounts [Abstract]
Reserve of preferred equity interests	$ 61,000	$ 0	$ 0

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- Definition

Adjustment (reserve) of preferred equity interests.

+ References

No definition available.

+ Details

Name:	ddr_AdjustmentReserveOfPreferredEquityInterests
Namespace Prefix:	ddr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_ValuationAndQualifyingAccountsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration