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Share-Based Compensation Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Feb. 09, 2016
Sep. 30, 2016
Class Of Stock [Line Items]    
Expected vesting percentage   20.00%
Performance Awards [Member]    
Class Of Stock [Line Items]    
Share price for vesting $ 19.58  
Performance Awards [Member] | Minimum [Member]    
Class Of Stock [Line Items]    
Aggregate percentage of performance awards 1.4909%  
2016 VSEP [Member]    
Class Of Stock [Line Items]    
Compensation fully earned and vested description   Awards made under the 2016 VSEP, if earned, may result in the granting of common shares of DDR and time-vested restricted stock units (“RSUs”) to participants on future measurement dates based on a performance period beginning on February 9, 2016, and ending on December 31, 2018 (the “Performance Period”). As a result, in general, the total compensation available to participants under the 2016 VSEP, if any, will be fully earned only after approximately seven years (the Performance Period and the final four-year time-based vesting period for RSUs).
Vesting period 7 years  
Settlement percentage of common shares 20.00%  
Settlement percentage of restricted stock units 80.00%  
Total unrecognized compensation cost granted   $ 3.6
Term of recognition of unrecognized stock option compensation cost   6 years 3 months
2016 VSEP [Member] | Minimum [Member]    
Class Of Stock [Line Items]    
Share price for vesting $ 17.41  
2016 VSEP [Member] | Maximum [Member]    
Class Of Stock [Line Items]    
Share price for vesting $ 25.35  
2016 VSEP [Member] | Time-based Vesting [Member]    
Class Of Stock [Line Items]    
Vesting period 4 years