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Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 09, 2016 | Mar. 31, 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% |
Performance Awards [Member] | Maximum [Member] |  |
Class Of Stock [Line Items] |  |
Share price for vesting | $ 19.58 |
Aggregate percentage of performance awards | 1.6089% |
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 |  | $ 5
Term of recognition of unrecognized stock option compensation cost |  | 6 years 9 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 |

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