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REAL ESTATE PROPERTIES REAL ESTATE PROPERTIES 2 (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) ft²
Sales of real estate properties [Line Items] |  |  |  |
Net Sales Price of Real Estate Sold |  | $ 22,004,000 | $ 37,557,000 | $ 73,725,000
Basis |  | 7,731,000 | 15,702,000 | 31,555,000
Gain, net of loss, on Sales of Real Estate Investments |  | $ 14,273,000 | $ 21,855,000 | $ 42,170,000
World Houston International Business Ctr 18 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 33,000 |  |
Date Of Property Sale |  | 1/26/18 |  |
Net Sales Price of Real Estate Sold |  | $ 2,289,000 |  |
Basis |  | 1,211,000 |  |
Gain, net of loss, on Sales of Real Estate Investments |  | $ 1,078,000 |  |
56th Street Commerce Park [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 181,000 |  |
Date Of Property Sale |  | 3/20/18 |  |
Net Sales Price of Real Estate Sold |  | $ 12,032,000 |  |
Basis |  | 2,888,000 |  |
Gain, net of loss, on Sales of Real Estate Investments |  | $ 9,144,000 |  |
35th Avenue Distribution Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  | 125,000 |  |
Date Of Property Sale |  | 7/26/18 |  |
Net Sales Price of Real Estate Sold |  | $ 7,683,000 |  |
Basis |  | 3,632,000 |  |
Gain, net of loss, on Sales of Real Estate Investments |  | 4,051,000 |  |
Stemmons Circle [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 99,000 |
Date Of Property Sale |  |  | 5/12/17 |
Net Sales Price of Real Estate Sold |  |  | $ 5,051,000 |
Basis |  |  | 1,329,000 |
Gain, net of loss, on Sales of Real Estate Investments |  |  | $ 3,722,000 |
Techway Southwest I, II, III, & IV [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  | 415,000 |
Date Of Property Sale |  |  | 6/19/17 |
Net Sales Price of Real Estate Sold |  |  | $ 32,506,000 |
Basis |  |  | 14,373,000 |
Gain, net of loss, on Sales of Real Estate Investments |  |  | 18,133,000 |
Northwest Point Distribution and Service Centers [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 232,000
Date Of Property Sale |  |  |  | 2/12/16
Net Sales Price of Real Estate Sold |  |  |  | $ 15,189,000
Basis |  |  |  | 5,080,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 10,109,000
North Stemmons III [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 60,000
Date Of Property Sale |  |  |  | 3/4/16
Net Sales Price of Real Estate Sold |  |  |  | $ 3,131,000
Basis |  |  |  | 1,908,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 1,223,000
North Stemmons II [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 26,000
Date Of Property Sale |  |  |  | 4/12/16
Net Sales Price of Real Estate Sold |  |  |  | $ 1,203,000
Basis |  |  |  | 765,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 438,000
Lockwood Distribution Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 392,000
Date Of Property Sale |  |  |  | 4/18/16
Net Sales Price of Real Estate Sold |  |  |  | $ 14,024,000
Basis |  |  |  | 4,154,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 9,870,000
West Loop Distribution Center 1 & 2 [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 161,000
Date Of Property Sale |  |  |  | 4/19/16
Net Sales Price of Real Estate Sold |  |  |  | $ 13,154,000
Basis |  |  |  | 3,564,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 9,590,000
America Plaza [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 121,000
Date Of Property Sale |  |  |  | 4/28/16
Net Sales Price of Real Estate Sold |  |  |  | $ 7,938,000
Basis |  |  |  | 3,378,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 4,560,000
Interstate Commons Distribution Center I and II [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 142,000
Date Of Property Sale |  |  |  | 5/31/16
Net Sales Price of Real Estate Sold |  |  |  | $ 9,906,000
Basis |  |  |  | 3,568,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | $ 6,338,000
Castilian Research Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² | [1] |  |  | 30,000
Date Of Property Sale | [1] |  |  | 6/28/16
Net Sales Price of Real Estate Sold | [1] |  |  | $ 7,698,000
Basis | [1] |  |  | 7,513,000
Gain, net of loss, on Sales of Real Estate Investments | [1] |  |  | $ 185,000
Memphis I [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Size (in square feet) of property sold | ft² |  |  |  | 92,000
Date Of Property Sale |  |  |  | 12/16/16
Net Sales Price of Real Estate Sold |  |  |  | $ 1,482,000
Basis |  |  |  | 1,625,000
Gain, net of loss, on Sales of Real Estate Investments |  |  |  | (143,000)
Land [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  | 2,577,000 | 3,778,000 | 5,400,000
Gain on sales of land |  | $ 86,000 | $ 293,000 | $ 733,000
Castilian Research Center [Member] |  |  |  |
Sales of real estate properties [Line Items] |  |  |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  |  |  | 80.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 20.00%
[1] | EastGroup owned 80% of Castilian Research Center through a joint venture. The information shown for this transaction also includes the 20% attributable to the Company's noncontrolling interest partner.

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