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Schedule III Real Estate and Accumulated Depreciation (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) Contract
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis | $ 10,800,000,000
Encumbrance 1 | FNMA |
Real Estate and Accumulated Depreciation [Line Items] |
Secured credit facilities, amount available | 80,000,000
Line of credit facility, amount outstanding | $ 80,000,000
Variable interest rate (percent) | 1.80%
Encumbrance 1 | FNMA | Interest Rate Swap |
Real Estate and Accumulated Depreciation [Line Items] |
Number of Interest rate derivatives held (contracts) | Contract | 1
Variable rate borrowings after interest rate swaps (percent) | 4.50%
Encumbrance 1 | FNMA | Interest Rate Cap |
Real Estate and Accumulated Depreciation [Line Items] |
Derivative, Notional Amount | $ 25,000,000
Encumbrance 2 | Fixed Rate Debt | Loan [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
Amount of bond used as encumbrance | $ 125,200,000.0
Derivative cap interest rate (percent) | 5.08%
Derivative termination date | Jun. 10, 2021
Furniture, fixtures and equipment |
Real Estate and Accumulated Depreciation [Line Items] |
Estimated useful lives (years) | 5 years
Minimum | Land improvements and buildings |
Real Estate and Accumulated Depreciation [Line Items] |
Estimated useful lives (years) | 8 years
Maximum | Land improvements and buildings |
Real Estate and Accumulated Depreciation [Line Items] |
Estimated useful lives (years) | 40 years
Retail Properties | Post Heights [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1997
Retail Properties | Highlands of West Village [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2012
Phase I | Wholly Owned Properties - Residential | Colonial Village at Trussville |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1996
Phase I | Wholly Owned Properties - Residential | Colonial Grand at Bellevue |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1996
Phase I | Wholly Owned Properties - Residential | Post Addison Circle [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1998
Phase I | Wholly Owned Properties - Residential | Post Heights [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1998
Phase I | Wholly Owned Properties - Residential | Post Uptown Village [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1995
Phase I | Wholly Owned Properties - Residential | Post Worthington [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1993
Phase I | Wholly Owned Properties - Residential | Colonial Village at Grapevine |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1985
Phase I | Wholly Owned Properties - Residential | Post Midtown Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1999
Phase I | Wholly Owned Properties - Residential | Cityscape at Market Center [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase I | Wholly Owned Properties - Residential | Station Square at Cosner's Corner |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase I | Wholly Owned Properties - Residential | Post Carlyle Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2006
Phase I | Wholly Owned Properties - Residential | Post Rocky Point [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1994
Phase I | Wholly Owned Properties - Residential | Colonial Grand at OldTown Scottsdale [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1994
Phase I | Wholly Owned Properties - Residential | Westside Creek I & II |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1984
Phase I | Wholly Owned Properties - Residential | St Augustine |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1987
Phase I | Wholly Owned Properties - Residential | Post Brookhaven [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1989
Phase I | Wholly Owned Properties - Residential | Post Peachtree Hills [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1992
Phase I | Wholly Owned Properties - Residential | Lake Lanier Club [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1998
Phase I | Wholly Owned Properties - Residential | Highlands of West Village [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2006
Phase I | Wholly Owned Properties - Residential | The Denton III [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase I | Wholly Owned Properties - Residential | Colonial Grand at Trinity Commons [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2000
Phase I | Wholly Owned Properties - Residential | River's Walk [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase I | Retail Properties | Post Addison Circle [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1998
Phase I | Retail Properties | Post Worthington [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1993
Phase I | Retail Properties | Post Midtown Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1999
Phase I | Retail Properties | Post Carlyle Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2006
Phase I | Retail Properties | Post Rocky Point [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1994
Phase I | Retail Properties | Rise Condo Development [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1999
Phase I | Other Property [Member] | Post Addison Circle [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1998
Phase II | Wholly Owned Properties - Residential | Colonial Village at Trussville |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1997
Phase II | Wholly Owned Properties - Residential | Colonial Grand at Bellevue |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2015
Phase II | Wholly Owned Properties - Residential | Post Addison Circle [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2000
Phase II | Wholly Owned Properties - Residential | Post Heights [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1999
Phase II | Wholly Owned Properties - Residential | Post Uptown Village [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2000
Phase II | Wholly Owned Properties - Residential | Post Worthington [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2008
Phase II | Wholly Owned Properties - Residential | Colonial Village at Grapevine |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1986
Phase II | Wholly Owned Properties - Residential | Post Midtown Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase II | Wholly Owned Properties - Residential | Cityscape at Market Center [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2015
Phase II | Wholly Owned Properties - Residential | Station Square at Cosner's Corner |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2016
Phase II | Wholly Owned Properties - Residential | Post Carlyle Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase II | Wholly Owned Properties - Residential | Post Rocky Point [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1996
Phase II | Wholly Owned Properties - Residential | Colonial Grand at OldTown Scottsdale [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1995
Phase II | Wholly Owned Properties - Residential | Westside Creek I & II |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1986
Phase II | Wholly Owned Properties - Residential | St Augustine |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2008
Phase II | Wholly Owned Properties - Residential | Post Brookhaven [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1992
Phase II | Wholly Owned Properties - Residential | Post Peachtree Hills [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1994
Phase II | Wholly Owned Properties - Residential | Lake Lanier Club [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2001
Phase II | Wholly Owned Properties - Residential | Highlands of West Village [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2012
Phase II | Wholly Owned Properties - Residential | The Denton III [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2014
Phase II | Wholly Owned Properties - Residential | Colonial Grand at Trinity Commons [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2002
Phase II | Wholly Owned Properties - Residential | River's Walk [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2016
Phase II | Retail Properties | Post Addison Circle [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2000
Phase II | Retail Properties | Post Worthington [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2008
Phase II | Retail Properties | Post Midtown Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase II | Retail Properties | Post Carlyle Square [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2016
Phase II | Retail Properties | Post Rocky Point [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 1996
Phase II | Retail Properties | Rise Condo Development [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2013
Phase II | Other Property [Member] | Post Addison Circle [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2000
Phase III [Member] | Wholly Owned Properties - Residential | Post Heights [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2009
Phase III [Member] | Wholly Owned Properties - Residential | Post Peachtree Hills [Member] |
Real Estate and Accumulated Depreciation [Line Items] |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction | Dec. 31, 2009

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