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DEVELOPMENT (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
DEVELOPMENT [Abstract] |  |
Percentage of Property Occupation by Tenants when Development Cost Ceased Being Capitalized | 90.00% | 80.00%
Length of Time After Project Completion When Development Cost are no Longer Capitalized | 1 year | 1 year

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- References No definition available. + Details
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Namespace Prefix: | egp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Length of Time (in years) After Project Completion When Development Cost Ceased Being Capitalized + References No definition available. + Details
Name: | egp_LengthofTimeAfterProjectCompletionWhenDevelopmentCostCeasedBeingCapitalized
Namespace Prefix: | egp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Threshold percentage of occupation by tenants when the development cost on a property is no longer capitalized. + References No definition available. + Details
Name: | egp_PercentageOfOccupationWhenDevelopmentCostCeasedBeingCapitalized
Namespace Prefix: | egp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant