Summary of Significant Accounting Policies - Summary of Estimated Net Future Amortization Income Associated with Above and Below-Market Leases (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Above And Below Market Lease Future Amortization Income [Abstract]
2015	$ 1.4ddr_FutureAmortizationIncomeYearOne
2016	2.7ddr_FutureAmortizationIncomeYearTwo
2017	4.0ddr_FutureAmortizationIncomeYearThree
2018	5.7ddr_FutureAmortizationIncomeYearFour
2019	$ 6.6ddr_FutureAmortizationIncomeYearFive

- Details

Name:	ddr_AboveAndBelowMarketLeaseFutureAmortizationIncomeAbstract
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- Definition

The amount of amortization income, net associated with above and below market leases expected to be recognized during year five of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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

- Definition

The amount of amortization income, net associated with above and below market leases expected to be recognized during year four of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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

- Definition

The amount of amortization income, net associated with above and below market leases expected to be recognized during year one of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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

- Definition

The amount of amortization income, net associated with above and below market leases expected to be recognized during year three of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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

- Definition

The amount of amortization income, net associated with above and below market leases expected to be recognized during year two of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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