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SCHEDULE III SCHEDULE III (Details2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at beginning of year $ 1,927,326,000us-gaap_RealEstateGrossAtCarryingValue [1] $ 1,768,032,000us-gaap_RealEstateGrossAtCarryingValue [1] $ 1,662,593,000us-gaap_RealEstateGrossAtCarryingValue
Purchases of real estate properties 47,477,000us-gaap_RealEstateOtherAcquisitions 65,387,000us-gaap_RealEstateOtherAcquisitions 48,934,000us-gaap_RealEstateOtherAcquisitions
Development of real estate properties 97,696,000us-gaap_RealEstateOtherAdditions 76,240,000us-gaap_RealEstateOtherAdditions 55,404,000us-gaap_RealEstateOtherAdditions
Improvements to real estate properties 19,862,000us-gaap_RealEstateImprovements 21,438,000us-gaap_RealEstateImprovements 18,164,000us-gaap_RealEstateImprovements
Carrying amount of investments sold (17,049,000)us-gaap_RealEstateCostOfRealEstateSold (3,475,000)us-gaap_RealEstateCostOfRealEstateSold (16,756,000)us-gaap_RealEstateCostOfRealEstateSold
Write-off of improvements (366,000)us-gaap_RealEstateOtherDeductions (296,000)us-gaap_RealEstateOtherDeductions (307,000)us-gaap_RealEstateOtherDeductions
Balance at end of year 2,074,946,000us-gaap_RealEstateGrossAtCarryingValue [1],[2],[3] 1,927,326,000us-gaap_RealEstateGrossAtCarryingValue [1] 1,768,032,000us-gaap_RealEstateGrossAtCarryingValue [1]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at beginning of year 550,113,000us-gaap_RealEstateAccumulatedDepreciation 496,247,000us-gaap_RealEstateAccumulatedDepreciation 451,805,000us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense 57,303,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 54,284,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 51,564,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Accumulated depreciation on assets sold (6,525,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold (126,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold (6,819,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Other (365,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions (292,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions (303,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Balance at end of year 600,526,000us-gaap_RealEstateAccumulatedDepreciation [2],[3] 550,113,000us-gaap_RealEstateAccumulatedDepreciation 496,247,000us-gaap_RealEstateAccumulatedDepreciation
Estimated aggregate cost of real estate properties for federal income tax purposes 2,044,327,000us-gaap_RealEstateFederalIncomeTaxBasis    
Estimated accumulated tax depreciation 385,355,000egp_EstimatedAccumulatedTaxDepreciation    
Percentage of Occupation When Development Cost Ceased Being Capitalized 80.00%egp_PercentageOfOccupationWhenDevelopmentCostCeasedBeingCapitalized    
Length of Time After Project Completion When Development Cost Ceased Being Capitalized 1 year    
Secured debt 453,776,000us-gaap_SecuredDebt 499,793,000us-gaap_SecuredDebt  
Recourse liability 5,000,000egp_RecourseLiability    
Castilian Research Center [Member]      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Noncontrolling Interests (in hundreths) 20.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= egp_CastilianResearchCenterMember		    
Noncontrolling Interests 1,794,000us-gaap_MinorityInterestPreferredStockAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= egp_CastilianResearchCenterMember		 1,794,000us-gaap_MinorityInterestPreferredStockAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= egp_CastilianResearchCenterMember		  
University Business Center [Member]      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Noncontrolling Interests (in hundreths) 20.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= egp_UniversityBusinessCenterMember		    
Noncontrolling Interests 6,536,000us-gaap_MinorityInterestPreferredStockAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= egp_UniversityBusinessCenterMember		 6,496,000us-gaap_MinorityInterestPreferredStockAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= egp_UniversityBusinessCenterMember		  
Buildings [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Estimated useful life (in years) 40 years    
Minimum [Member] | Improvements and Personal Property [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Estimated useful life (in years) 3 years    
Maximum [Member] | Improvements and Personal Property [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Estimated useful life (in years) 15 years    
Dominguez, Industry I and III, Kingsview, Shaw, Walnut and Washington [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 56,970,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_DominguezIndustryIAndIiiKingsviewShawWalnutAndWashingtonMember		 [4] 59,087,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_DominguezIndustryIAndIiiKingsviewShawWalnutAndWashingtonMember		 [4]  
Arion 16, Broadway VI, Chino, East University I and II, Northpark I-IV, Santan 10 II, 55th Avenue and World Houston 1 and 2, 21 and 23 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 54,259,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_Arion16BroadwayViChinoEastUniversityIAndIiNorthparkIIvSantan10IiSouth55ThAvenueAndWorldHouston1And221And23Member		 57,368,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_Arion16BroadwayViChinoEastUniversityIAndIiNorthparkIIvSantan10IiSouth55ThAvenueAndWorldHouston1And221And23Member		  
America Plaza, Central Green, Glenmont I & II, Interstate I, II & III, Rojas, Stemmons Circle, Venture, West Loop I & II and World Houston 3-9 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 57,579,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_AmericaPlazaCentralGreenGlenmontIIiInterstateIIiIiiRojasStemmonsCircleVentureWestLoopIIiAndWorldHouston39Member		 59,827,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_AmericaPlazaCentralGreenGlenmontIIiInterstateIIiIiiRojasStemmonsCircleVentureWestLoopIIiAndWorldHouston39Member		  
Arion 18, Beltway VI & VII, Commerce Park II & III, Concord Dist Ctr, Interstate Dist Ctr V, VI & VII, Lakeview Business Ctr, Ridge Creek Distribution Ctr II, Southridge IV & V and World Houston 32 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 48,592,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_Arion18BeltwayViViiCommerceParkIiIiiConcordDistCtrInterstateDistCtrVViViiLakeviewBusinessCtrRidgeCreekDistributionCtrIiSouthridgeIvVAndWorldHouston32Member		 50,519,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_Arion18BeltwayViViiCommerceParkIiIiiConcordDistCtrInterstateDistCtrVViViiLakeviewBusinessCtrRidgeCreekDistributionCtrIiSouthridgeIvVAndWorldHouston32Member		  
Americas Ten I, Kirby, Palm River North I, II and III, Shady Trail, Westlake I and II and World Houston 17 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 0us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_AmericasTenIKirbyPalmRiverNorthIIiAndIiiShadyTrailWestlakeIAndIiAndWorldHouston17Member		 26,907,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_AmericasTenIKirbyPalmRiverNorthIIiAndIiiShadyTrailWestlakeIAndIiAndWorldHouston17Member		  
Country Club I, Lake Pointe, Techway Southwest II and World Houston 19 and 20 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 26,074,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_CountryClubILakePointeTechwaySouthwestIiAndWorldHouston19And20Member		 27,812,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_CountryClubILakePointeTechwaySouthwestIiAndWorldHouston19And20Member		  
Huntwood and Wiegman I-IV Distribution Centers [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 27,246,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_HuntwoodandWiegmanIIVDistributionCentersMember		 28,833,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_HuntwoodandWiegmanIIVDistributionCentersMember		  
Alamo Downs, Arion 1-15 and 17, Rampart I, II, III & IV, Santan 10 and World Houston 16 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 56,945,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_AlamoDownsArion115and17RampartIIIIIIandIVSantan10andWorldHouston16Member		 60,131,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_AlamoDownsArion115and17RampartIIIIIIandIVSantan10andWorldHouston16Member		  
Beltway II, III and IV, Commerce Park 1, Eastlake, Fairgrounds I-IV, Nations Ford I-IV, Techway Southwest III, Wetmore I-IV and World Houston 15 and 22 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt 58,262,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_BeltwayIiIiiAndIvCommercePark1EastlakeFairgroundsIIvNationsFordIIvTechwaySouthwestIiiWetmoreIIvAndWorldHouston15And22Member		 61,402,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_BeltwayIiIiiAndIvCommercePark1EastlakeFairgroundsIIvNationsFordIIvTechwaySouthwestIiiWetmoreIIvAndWorldHouston15And22Member		  
Fortieth Avenue, Beltway V, Centennial Park, Executive Airport, Ocean View, Techway Southwest IV, Wetmore V-VIII and World Houston 26, 28, 29 and 30 [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Secured debt $ 64,119,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_FortiethAvenueBeltwayVCentennialParkExecutiveAirportOceanViewTechwaySouthwestIvWetmoreVViiiAndWorldHouston262829And30Member		 $ 66,805,000us-gaap_SecuredDebt
/ us-gaap_ParticipatingMortgageLoansAxis
= egp_FortiethAvenueBeltwayVCentennialParkExecutiveAirportOceanViewTechwaySouthwestIvWetmoreVViiiAndWorldHouston262829And30Member		  
[1] Includes 20% noncontrolling interests in Castilian Research Center of $1,794,000 at December 31, 2014 and $1,794,000 at December 31, 2013 and in University Business Center of $6,536,000 and $6,496,000, respectively.
[2] The estimated aggregate cost of real estate properties at December 31, 2014 for federal income tax purposes was approximately $2,044,327,000 before estimated accumulated tax depreciation of $385,355,000. The federal income tax return for the year ended December 31, 2014, has not been filed and accordingly, this estimate is based on preliminary data.
[3] Changes in Real Estate Properties follow: Years Ended December 31,2014 2013 2012(In thousands)Balance at beginning of year $1,927,326 1,768,032 1,662,593Purchases of real estate properties 47,477 65,387 48,934Development of real estate properties97,696 76,240 55,404Improvements to real estate properties19,862 21,438 18,164Carrying amount of investments sold (17,049) (3,475) (16,756)Write-off of improvements (366) (296) (307)Balance at end of year (1) $2,074,946 1,927,326 1,768,032(1)Includes 20% noncontrolling interests in Castilian Research Center of $1,794,000 at December 31, 2014 and $1,794,000 at December 31, 2013 and in University Business Center of $6,536,000 and $6,496,000, respectively.Changes in the accumulated depreciation on real estate properties follow: Years Ended December 31,2014 2013 2012(In thousands)Balance at beginning of year $550,113 496,247 451,805Depreciation expense 57,303 54,284 51,564Accumulated depreciation on assets sold (6,525) (126) (6,819)Other (365) (292) (303)Balance at end of year $600,526 550,113 496,247
[4] This mortgage loan has a recourse liability of $5.0 million which will be released based on the secured properties generating certain base rent amounts.