REAL ESTATE PROPERTY ACQUISITIONS AND ACQUIRED INTANGIBLES (Details)		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) ft²
Property Acquisition [Line Items]
Right of use assets - Ground leases (operating)	[1]	$ 23,051,000		$ 23,051,000		$ 11,073,000
Amortization expense for lease intangibles		1,647,000	$ 1,342,000	4,385,000	$ 4,048,000
Above and below market leases Increase (decrease) rental Income		230,000	$ 332,000	$ 704,000	$ 1,078,000
Percentage of acquisition price to be spent on capital items to qualify as value-add property				20.00%		20.00%
Percentage of occupancy to qualify as value-add property				75.00%		75.00%
2020 Acquisitions [Member]
Property Acquisition [Line Items]
Total Real Estate Properties						$ 73,560,000
Total assets acquired, net of liabilities assumed						$ 76,518,000
Weighted Average Remaining Lease Term of Acquired Properties						3 years 10 months 24 days
Land						$ 23,565,000
Buildings						42,024,000
Tenant Improvements						7,971,000
Cost of Property Acquired						$ 76,518,000
Area of Real Estate Property | ft²						509,000
2020 Acquisitions [Member] | Leases, Acquired-in-Place [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of real estate	[2]					$ 3,257,000
2020 Acquisitions [Member] | Above Market Leases [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of real estate	[2]					104,000
2020 Acquisitions [Member] | Below market lease [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of real estate	[3]					(403,000)
2021 operating property acquisitions
Property Acquisition [Line Items]
Cost of Property Acquired		$ 104,006,000		$ 104,006,000
Area of Real Estate Property | ft²		740,000		740,000
2021 operating property acquisitions | Southpark Distribution Center II
Property Acquisition [Line Items]
Cost of Property Acquired	[4]	$ 9,177,000		$ 9,177,000
Area of Real Estate Property | ft²	[4]	79,000		79,000
Date of Acquisition	[4]			Jun. 10, 2021
2021 operating property acquisitions | DFW Global Logistics Centre
Property Acquisition [Line Items]
Cost of Property Acquired		$ 89,829,000		$ 89,829,000
Area of Real Estate Property | ft²		611,000		611,000
Date of Acquisition				Aug. 26, 2021
2021 operating property acquisitions | Progress Center 3
Property Acquisition [Line Items]
Cost of Property Acquired		$ 5,000,000		$ 5,000,000
Area of Real Estate Property | ft²		50,000		50,000
Date of Acquisition				Sep. 23, 2021
2021 Value-add Property Acquisitions
Property Acquisition [Line Items]
Cost of Property Acquired	[5]	$ 36,597,000		$ 36,597,000
Area of Real Estate Property | ft²	[5]	499,000		499,000
2021 Value-add Property Acquisitions | Access Point I
Property Acquisition [Line Items]
Cost of Property Acquired	[5]	$ 10,501,000		$ 10,501,000
Area of Real Estate Property | ft²	[5]	156,000		156,000
Date of Acquisition	[5]			Jan. 15, 2021
2021 Value-add Property Acquisitions | Northpoint 200
Property Acquisition [Line Items]
Cost of Property Acquired	[5]	$ 6,516,000		$ 6,516,000
Area of Real Estate Property | ft²	[5]	79,000		79,000
Date of Acquisition	[5]			Jan. 21, 2021
2021 Value-add Property Acquisitions | Cherokee 75 Business Center
Property Acquisition [Line Items]
Cost of Property Acquired	[5]	$ 8,837,000		$ 8,837,000
Area of Real Estate Property | ft²	[5]	105,000		105,000
Date of Acquisition	[5]			Jun. 17, 2021
2021 Value-add Property Acquisitions | Access Point 2
Property Acquisition [Line Items]
Cost of Property Acquired	[5]	$ 10,743,000		$ 10,743,000
Area of Real Estate Property | ft²	[5]	159,000		159,000
Date of Acquisition	[5]			May 19, 2021
2021 Acquisitions
Property Acquisition [Line Items]
Total Real Estate Properties		$ 148,982,000		$ 148,982,000
Operating Lease Liabilities - ground leases		(12,708,000)		(12,708,000)
Total assets acquired, net of liabilities assumed		$ 140,603,000		$ 140,603,000
Weighted Average Remaining Lease Term of Acquired Properties		2 years 9 months 18 days		2 years 9 months 18 days
Land		$ 6,596,000		$ 6,596,000
Buildings		127,709,000		127,709,000
Tenant Improvements		1,969,000		1,969,000
Right of use assets - Ground leases (operating)		12,708,000		12,708,000
Cost of Property Acquired		$ 140,603,000		$ 140,603,000
Area of Real Estate Property | ft²		1,239,000		1,239,000
2021 Acquisitions | Leases, Acquired-in-Place [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of real estate	[2]	$ 5,763,000		$ 5,763,000
2021 Acquisitions | Above Market Leases [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of real estate	[2]	5,000		5,000
2021 Acquisitions | Below market lease [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of real estate	[3]	$ (1,439,000)		$ (1,439,000)
2020 operating property acquisitions
Property Acquisition [Line Items]
Cost of Property Acquired	[4]					$ 48,656,000
Area of Real Estate Property | ft²	[4]					347,000
2020 operating property acquisitions | Wells Point One
Property Acquisition [Line Items]
Cost of Property Acquired	[4]					$ 6,231,000
Area of Real Estate Property | ft²	[4]					50,000
Date of Acquisition	[4]					Feb. 28, 2020
2020 operating property acquisitions | Cherokee 75 Business Center I
Property Acquisition [Line Items]
Cost of Property Acquired	[4]					$ 8,323,000
Area of Real Estate Property | ft²	[4]					85,000
Date of Acquisition	[4]					Dec. 15, 2020
2020 operating property acquisitions | The Rock
Property Acquisition [Line Items]
Cost of Property Acquired	[4]					$ 34,102,000
Area of Real Estate Property | ft²	[4]					212,000
Date of Acquisition	[4]					Dec. 17, 2020
2020 Value-Add Property Acquisitions | Rancho Distribution Center [Member]
Property Acquisition [Line Items]
Cost of Property Acquired	[5]					$ 27,862,000
Area of Real Estate Property | ft²	[5]					162,000
Date of Acquisition	[5]					Oct. 15, 2020

[1] EastGroup applies the principles of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 842, Leases, and its related Accounting Standards Updates (“ASUs”) to account for its ground leases, which are classified as operating leases. The related operating lease liabilities for ground leases are included in Other liabilities on the Consolidated Balance Sheets.

[2] In-place lease intangibles and above market lease intangibles are each included in Other assets on the Consolidated Balance Sheets. These costs are amortized over the remaining lives of the associated leases in place at the time of acquisition.

[3] Below market lease intangibles are included in Other liabilities on the Consolidated Balance Sheets. These costs are amortized over the remaining lives of the associated leases in place at the time of acquisition.

[4] Operating properties are defined as stabilized real estate properties (land including buildings and improvements) in the Company’s operating portfolio; included in Real estate properties on the Consolidated Balance Sheets.

[5] Value-add properties are defined as properties that are either acquired but not stabilized or can be converted to a higher and better use.  Acquired properties meeting either of the following two conditions are considered value-add properties:  (1) Less than 75% occupied as of the acquisition date (or will be less than 75% occupied within one year of acquisition date based on near term lease roll), or (2) 20% or greater of the acquisition cost will be spent to redevelop the property.