Other Assets, Net - Components of Other Assets (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Other Assets [Abstract]
Amortization expense	$ 16.6	$ 19.5

Amortization of intangible assets excluding above and below market leases.

No definition available.

Name:	ddr_AmortizationOfIntangibleAssetsExcludingAboveAndBelowMarketLeases
Namespace Prefix:	ddr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration