REAL ESTATE PROPERTIES - Sales of Real Estate (Details)		12 Months Ended
		Dec. 31, 2021 USD ($) ft²	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($) ft²
Real Estate Properties [Line Items]
Net Sales Price of Real Estate Sold		$ 44,260,000	$ 20,510,000	$ 66,559,000
Basis		5,401,000	7,365,000	25,491,000
Gain on Sales of Real Estate Investments		$ 38,859,000	$ 13,145,000	$ 41,068,000
Land [Member] | Yosemite Land
Real Estate Properties [Line Items]
SIze (in acres) of land sold | ft²				0.2
Proceeds from Sale of Property, Plant, and Equipment				$ 185,000
Gain on sales of land				$ 83,000
University Business Center 120 [Member]
Real Estate Properties [Line Items]
Less Than Wholly Owned Joint Venture Investment Ownership Percentage			80.00%
Less Than Wholly Owned Joint Venture Investment Ownership Percentage Sold			80.00%
University Business Center 130 [Member]
Real Estate Properties [Line Items]
Less Than Wholly Owned Joint Venture Investment Ownership Percentage				80.00%
Less Than Wholly Owned Joint Venture Investment Ownership Percentage				20.00%
Jetport Commerce Park [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²		284,000
Date Of Property Sale		11/09/2021
Net Sales Price of Real Estate Sold		$ 44,260,000
Basis		5,401,000
Gain on Sales of Real Estate Investments		$ 38,859,000
University Business Center 120 [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²	[1]		46,000
Date Of Property Sale	[1]		12/01/2020
Net Sales Price of Real Estate Sold	[1]		$ 10,342,000
Basis	[1]		4,007,000
Gain on Sales of Real Estate Investments	[1]		$ 6,335,000
Central Green Distribution Center [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²			80,000
Date Of Property Sale			12/23/2020
Net Sales Price of Real Estate Sold			$ 10,168,000
Basis			3,358,000
Gain on Sales of Real Estate Investments			$ 6,810,000
World Houston International Business Ctr 5 [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²				51,000
Date Of Property Sale				01/29/2019
Net Sales Price of Real Estate Sold				$ 3,679,000
Basis				1,354,000
Gain on Sales of Real Estate Investments				$ 2,325,000
Altamonte Commerce Center [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²				186,000
Date Of Property Sale				05/20/2019
Net Sales Price of Real Estate Sold				$ 14,423,000
Basis				5,342,000
Gain on Sales of Real Estate Investments				$ 9,081,000
University Business Center 130 [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²	[2]			40,000
Date Of Property Sale	[2]			11/07/2019
Net Sales Price of Real Estate Sold	[2]			$ 11,083,000
Basis	[2]			2,729,000
Gain on Sales of Real Estate Investments	[2]			$ 8,354,000
Southpointe Distribution Center [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²				207,000
Date Of Property Sale				12/03/2019
Net Sales Price of Real Estate Sold				$ 13,699,000
Basis				2,281,000
Gain on Sales of Real Estate Investments				$ 11,418,000
University Business Center 125 and 175 [Member]
Real Estate Properties [Line Items]
Size (in square feet) of property sold | ft²				133,000
Date Of Property Sale				12/11/2019
Net Sales Price of Real Estate Sold				$ 23,675,000
Basis				13,785,000
Gain on Sales of Real Estate Investments				$ 9,890,000

[1] EastGroup owned 80% of University Business Center 120 through a joint venture partnership. EastGroup sold its 80% share of the joint venture, and the partnership was dissolved. The information shown for this transaction represents EastGroup’s 80% ownership.

[2] EastGroup owned 80% of University Business Center 130 through a joint venture partnership. The information shown for this transaction also includes the 20% attributable to the Company’s noncontrolling interest partner.