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Schedule III Real Estate and Accumulated Depreciation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 923,561,000      
Initial Cost Land 958,186,000      
Initial Cost Buildings and Fixtures 6,098,194,000      
Gross Amount, Land 978,311,000      
Gross Amount, Buildings and Fixtures 7,237,457,000      
Total 8,215,768,000 $ 8,069,395,000 $ 7,722,181,000 $ 3,729,706,000
Accumulated Depreciation (1,499,213,000) $ (1,373,678,000) $ (1,138,315,000) $ (1,040,473,000)
Net 6,716,555,000      
Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 20,125,000      
Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,139,263,000      
Total Residential Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 923,561,000      
Initial Cost Land 878,643,000      
Initial Cost Buildings and Fixtures 6,061,011,000      
Gross Amount, Land 898,759,000      
Gross Amount, Buildings and Fixtures 7,142,705,000      
Total 8,041,464,000      
Accumulated Depreciation (1,479,667,000)      
Net 6,561,797,000      
Total Residential Properties | Colonial Grand at Quarterdeck [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 920,000      
Initial Cost Buildings and Fixtures 24,097,000      
Gross Amount, Land 920,000      
Gross Amount, Buildings and Fixtures 26,984,000      
Total 27,904,000      
Accumulated Depreciation (2,451,000)      
Net $ 25,453,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Colonial Grand at Quarterdeck [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Quarterdeck [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Westchase [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,571,000      
Initial Cost Buildings and Fixtures 20,091,000      
Gross Amount, Land 4,571,000      
Gross Amount, Buildings and Fixtures 21,567,000      
Total 26,138,000      
Accumulated Depreciation (2,416,000)      
Net $ 23,722,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Colonial Village at Westchase [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Westchase [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | River's Walk [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,200,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 5,200,000      
Gross Amount, Buildings and Fixtures 28,810,000      
Total 34,010,000      
Accumulated Depreciation (1,573,000)      
Net $ 32,437,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | River's Walk [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | River's Walk [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Fairways [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 910,000      
Initial Cost Buildings and Fixtures 8,207,000      
Gross Amount, Land 910,000      
Gross Amount, Buildings and Fixtures 12,038,000      
Total 12,948,000      
Accumulated Depreciation (8,106,000)      
Net $ 4,842,000      
Date of Construction Dec. 31, 1992      
Total Residential Properties | Fairways [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Fairways [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Columbia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,840,000      
Initial Cost Buildings and Fixtures 16,560,000      
Gross Amount, Land 1,840,000      
Gross Amount, Buildings and Fixtures 21,108,000      
Total 22,948,000      
Accumulated Depreciation (13,117,000)      
Net $ 9,831,000      
Date of Construction Dec. 31, 1991      
Total Residential Properties | Paddock Club Columbia [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Columbia [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Tanglewood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 427,000      
Initial Cost Buildings and Fixtures 3,853,000      
Gross Amount, Land 427,000      
Gross Amount, Buildings and Fixtures 7,339,000      
Total 7,766,000      
Accumulated Depreciation (5,175,000)      
Net $ 2,591,000      
Date of Construction Dec. 31, 1980      
Total Residential Properties | Tanglewood [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Tanglewood [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Corners [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 685,000      
Initial Cost Buildings and Fixtures 6,165,000      
Gross Amount, Land 685,000      
Gross Amount, Buildings and Fixtures 9,618,000      
Total 10,303,000      
Accumulated Depreciation (7,112,000)      
Net $ 3,191,000      
Date of Construction Dec. 31, 1982      
Total Residential Properties | Corners [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Corners [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Birchall at Ross Bridge        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,640,000      
Initial Cost Buildings and Fixtures 28,842,000      
Gross Amount, Land 2,640,000      
Gross Amount, Buildings and Fixtures 29,690,000      
Total 32,330,000      
Accumulated Depreciation (4,487,000)      
Net $ 27,843,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Birchall at Ross Bridge | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Birchall at Ross Bridge | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Riverchase Trails        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,761,000      
Initial Cost Buildings and Fixtures 22,079,000      
Gross Amount, Land 3,761,000      
Gross Amount, Buildings and Fixtures 23,654,000      
Total 27,415,000      
Accumulated Depreciation (2,574,000)      
Net $ 24,841,000      
Date of Construction Dec. 31, 2010      
Total Residential Properties | Colonial Grand at Riverchase Trails | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Riverchase Trails | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Trussville        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,402,000      
Initial Cost Buildings and Fixtures 31,813,000      
Gross Amount, Land 3,402,000      
Gross Amount, Buildings and Fixtures 33,108,000      
Total 36,510,000      
Accumulated Depreciation (3,267,000)      
Net $ 33,243,000      
Total Residential Properties | Colonial Village at Trussville | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Trussville | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Eagle Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 851,000      
Initial Cost Buildings and Fixtures 7,667,000      
Gross Amount, Land 851,000      
Gross Amount, Buildings and Fixtures 12,043,000      
Total 12,894,000      
Accumulated Depreciation (7,454,000)      
Net $ 5,440,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Eagle Ridge | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Eagle Ridge | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Traditions        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,211,000      
Initial Cost Buildings and Fixtures 25,162,000      
Gross Amount, Land 3,211,000      
Gross Amount, Buildings and Fixtures 26,390,000      
Total 29,601,000      
Accumulated Depreciation (2,834,000)      
Net $ 26,767,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Colonial Grand at Traditions | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Traditions | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Abbington Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 524,000      
Initial Cost Buildings and Fixtures 4,724,000      
Gross Amount, Land 524,000      
Gross Amount, Buildings and Fixtures 7,771,000      
Total 8,295,000      
Accumulated Depreciation (4,901,000)      
Net $ 3,394,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Abbington Place | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Abbington Place | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Edgewater        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 27,722,000      
Initial Cost Land 4,943,000      
Initial Cost Buildings and Fixtures 38,673,000      
Gross Amount, Land 4,943,000      
Gross Amount, Buildings and Fixtures 42,085,000      
Total 47,028,000      
Accumulated Depreciation (3,792,000)      
Net $ 43,236,000      
Date of Construction Dec. 31, 1990      
Total Residential Properties | Colonial Grand at Edgewater | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Edgewater | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Huntsville        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 909,000      
Initial Cost Buildings and Fixtures 10,152,000      
Gross Amount, Land 1,739,000      
Gross Amount, Buildings and Fixtures 24,349,000      
Total 26,088,000      
Accumulated Depreciation (13,330,000)      
Net $ 12,758,000      
Date of Construction Dec. 31, 1993      
Total Residential Properties | Paddock Club Huntsville | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Huntsville | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Madison        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 22,500,000      
Initial Cost Land 3,601,000      
Initial Cost Buildings and Fixtures 28,934,000      
Gross Amount, Land 3,601,000      
Gross Amount, Buildings and Fixtures 29,652,000      
Total 33,253,000      
Accumulated Depreciation (3,053,000)      
Net $ 30,200,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Colonial Grand at Madison | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Madison | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Montgomery        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 965,000      
Initial Cost Buildings and Fixtures 13,190,000      
Gross Amount, Land 965,000      
Gross Amount, Buildings and Fixtures 15,240,000      
Total 16,205,000      
Accumulated Depreciation (7,316,000)      
Net $ 8,889,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Paddock Club Montgomery | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Montgomery | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Cypress Village at Cypress Village        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,290,000      
Initial Cost Buildings and Fixtures 12,238,000      
Gross Amount, Land 1,290,000      
Gross Amount, Buildings and Fixtures 12,706,000      
Total 13,996,000      
Accumulated Depreciation (1,267,000)      
Net $ 12,729,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Cypress Village at Cypress Village | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Cypress Village at Cypress Village | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Liberty Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,823,000      
Initial Cost Land 3,922,000      
Initial Cost Buildings and Fixtures 30,977,000      
Gross Amount, Land 3,922,000      
Gross Amount, Buildings and Fixtures 33,268,000      
Total 37,190,000      
Accumulated Depreciation (3,279,000)      
Net $ 33,911,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Colonial Grand at Liberty Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Liberty Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at OldTown Scottsdale [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 7,820,000      
Initial Cost Buildings and Fixtures 51,627,000      
Gross Amount, Land 7,820,000      
Gross Amount, Buildings and Fixtures 54,291,000      
Total 62,111,000      
Accumulated Depreciation (5,141,000)      
Net $ 56,970,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Colonial Grand at OldTown Scottsdale [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at OldTown Scottsdale [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Calais Forest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,026,000      
Initial Cost Buildings and Fixtures 9,244,000      
Gross Amount, Land 1,026,000      
Gross Amount, Buildings and Fixtures 17,645,000      
Total 18,671,000      
Accumulated Depreciation (11,296,000)      
Net $ 7,375,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Calais Forest [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Calais Forest [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | SkySong [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 0      
Initial Cost Buildings and Fixtures 55,748,000      
Gross Amount, Land 0      
Gross Amount, Buildings and Fixtures 56,044,000      
Total 56,044,000      
Accumulated Depreciation (834,000)      
Net $ 55,210,000      
Date of Construction Dec. 31, 2014      
Total Residential Properties | SkySong [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | SkySong [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Napa Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 960,000      
Initial Cost Buildings and Fixtures 8,642,000      
Gross Amount, Land 960,000      
Gross Amount, Buildings and Fixtures 13,889,000      
Total 14,849,000      
Accumulated Depreciation (8,670,000)      
Net $ 6,179,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Napa Valley [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Napa Valley [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Palisades At Chenal Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,560,000      
Initial Cost Buildings and Fixtures 25,234,000      
Gross Amount, Land 2,560,000      
Gross Amount, Buildings and Fixtures 27,500,000      
Total 30,060,000      
Accumulated Depreciation (3,962,000)      
Net $ 26,098,000      
Date of Construction Dec. 31, 2006      
Total Residential Properties | Palisades At Chenal Valley [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Palisades At Chenal Valley [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Ridge at Chenal Valley        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,626,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 2,626,000      
Gross Amount, Buildings and Fixtures 26,917,000      
Total 29,543,000      
Accumulated Depreciation (2,375,000)      
Net $ 27,168,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Ridge at Chenal Valley | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Ridge at Chenal Valley | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Westside Creek I & II        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 1,271,000      
Initial Cost Buildings and Fixtures 11,463,000      
Gross Amount, Land 1,271,000      
Gross Amount, Buildings and Fixtures 19,749,000      
Total 21,020,000      
Accumulated Depreciation (11,414,000)      
Net $ 9,606,000      
Total Residential Properties | Westside Creek I & II | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Westside Creek I & II | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Edge at Lyon's Gate        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 7,901,000      
Initial Cost Buildings and Fixtures 27,182,000      
Gross Amount, Land 7,901,000      
Gross Amount, Buildings and Fixtures 28,814,000      
Total 36,715,000      
Accumulated Depreciation (7,460,000)      
Net $ 29,255,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Edge at Lyon's Gate | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Edge at Lyon's Gate | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Sky View Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,668,000      
Initial Cost Buildings and Fixtures 14,577,000      
Gross Amount, Land 2,668,000      
Gross Amount, Buildings and Fixtures 16,038,000      
Total 18,706,000      
Accumulated Depreciation (3,737,000)      
Net $ 14,969,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Sky View Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Sky View Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Talus Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 12,741,000      
Initial Cost Buildings and Fixtures 47,701,000      
Gross Amount, Land 12,741,000      
Gross Amount, Buildings and Fixtures 49,747,000      
Total 62,488,000      
Accumulated Depreciation (15,984,000)      
Net $ 46,504,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Talus Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Talus Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Inverness Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,219,000      
Initial Cost Buildings and Fixtures 26,255,000      
Gross Amount, Land 4,219,000      
Gross Amount, Buildings and Fixtures 27,184,000      
Total 31,403,000      
Accumulated Depreciation (2,661,000)      
Net $ 28,742,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Colonial Grand at Inverness Commons | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Inverness Commons | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Scottsdale        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,612,000      
Initial Cost Buildings and Fixtures 20,273,000      
Gross Amount, Land 3,612,000      
Gross Amount, Buildings and Fixtures 21,617,000      
Total 25,229,000      
Accumulated Depreciation (2,099,000)      
Net $ 23,130,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Colonial Grand at Scottsdale | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Scottsdale | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Tiffany Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 1,024,000      
Initial Cost Buildings and Fixtures 9,219,000      
Gross Amount, Land 1,024,000      
Gross Amount, Buildings and Fixtures 15,382,000      
Total 16,406,000      
Accumulated Depreciation (10,400,000)      
Net $ 6,006,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Tiffany Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Tiffany Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Indigo Point        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,167,000      
Initial Cost Buildings and Fixtures 10,500,000      
Gross Amount, Land 1,167,000      
Gross Amount, Buildings and Fixtures 14,254,000      
Total 15,421,000      
Accumulated Depreciation (8,157,000)      
Net $ 7,264,000      
Date of Construction Dec. 31, 1989      
Total Residential Properties | Indigo Point | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Indigo Point | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Brandon        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,896,000      
Initial Cost Buildings and Fixtures 26,111,000      
Gross Amount, Land 2,896,000      
Gross Amount, Buildings and Fixtures 31,799,000      
Total 34,695,000      
Accumulated Depreciation (17,936,000)      
Net $ 16,759,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Paddock Club Brandon | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Brandon | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Lakewood Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,980,000      
Initial Cost Buildings and Fixtures 40,230,000      
Gross Amount, Land 2,980,000      
Gross Amount, Buildings and Fixtures 41,927,000      
Total 44,907,000      
Accumulated Depreciation (3,952,000)      
Net $ 40,955,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Colonial Grand at Lakewood Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Lakewood Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Preserve at Coral Square        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 9,600,000      
Initial Cost Buildings and Fixtures 40,004,000      
Gross Amount, Land 9,600,000      
Gross Amount, Buildings and Fixtures 49,192,000      
Total 58,792,000      
Accumulated Depreciation (19,518,000)      
Net $ 39,274,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Preserve at Coral Square | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Preserve at Coral Square | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Gainesville        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,800,000      
Initial Cost Buildings and Fixtures 15,879,000      
Gross Amount, Land 1,800,000      
Gross Amount, Buildings and Fixtures 20,226,000      
Total 22,026,000      
Accumulated Depreciation (8,509,000)      
Net $ 13,517,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Paddock Club Gainesville | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Gainesville | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | The Retreat at Magnolia Parke        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,040,000      
Initial Cost Buildings and Fixtures 16,338,000      
Gross Amount, Land 2,040,000      
Gross Amount, Buildings and Fixtures 16,744,000      
Total 18,784,000      
Accumulated Depreciation (2,688,000)      
Net $ 16,096,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | The Retreat at Magnolia Parke | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | The Retreat at Magnolia Parke | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Heathrow        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,594,000      
Initial Cost Land 4,101,000      
Initial Cost Buildings and Fixtures 35,684,000      
Gross Amount, Land 4,101,000      
Gross Amount, Buildings and Fixtures 37,111,000      
Total 41,212,000      
Accumulated Depreciation (3,675,000)      
Net $ 37,537,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Heathrow | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Heathrow | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Atlantic Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,000,000      
Initial Cost Buildings and Fixtures 19,495,000      
Gross Amount, Land 4,000,000      
Gross Amount, Buildings and Fixtures 20,741,000      
Total 24,741,000      
Accumulated Depreciation (3,496,000)      
Net $ 21,245,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Atlantic Crossing | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Atlantic Crossing | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Cooper's Hawk        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 854,000      
Initial Cost Buildings and Fixtures 7,500,000      
Gross Amount, Land 854,000      
Gross Amount, Buildings and Fixtures 11,450,000      
Total 12,304,000      
Accumulated Depreciation (7,899,000)      
Net $ 4,405,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Cooper's Hawk | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Cooper's Hawk | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Hunter's Ridge at Deerwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,533,000      
Initial Cost Buildings and Fixtures 13,835,000      
Gross Amount, Land 1,533,000      
Gross Amount, Buildings and Fixtures 20,699,000      
Total 22,232,000      
Accumulated Depreciation (12,756,000)      
Net $ 9,476,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Hunter's Ridge at Deerwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Hunter's Ridge at Deerwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lakeside        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,430,000      
Initial Cost Buildings and Fixtures 12,883,000      
Gross Amount, Land 1,430,000      
Gross Amount, Buildings and Fixtures 22,860,000      
Total 24,290,000      
Accumulated Depreciation (16,129,000)      
Net $ 8,161,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Lakeside | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lakeside | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lighthouse at Fleming Island        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 4,047,000      
Initial Cost Buildings and Fixtures 35,052,000      
Gross Amount, Land 4,047,000      
Gross Amount, Buildings and Fixtures 40,539,000      
Total 44,586,000      
Accumulated Depreciation (17,354,000)      
Net $ 27,232,000      
Date of Construction Dec. 31, 2003      
Total Residential Properties | Lighthouse at Fleming Island | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lighthouse at Fleming Island | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Mandarin        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,411,000      
Initial Cost Buildings and Fixtures 14,967,000      
Gross Amount, Land 1,411,000      
Gross Amount, Buildings and Fixtures 17,928,000      
Total 19,339,000      
Accumulated Depreciation (8,503,000)      
Net $ 10,836,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Paddock Club Mandarin | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Mandarin | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | St Augustine        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,857,000      
Initial Cost Buildings and Fixtures 6,475,000      
Gross Amount, Land 2,857,000      
Gross Amount, Buildings and Fixtures 14,060,000      
Total 16,917,000      
Accumulated Depreciation (9,973,000)      
Net $ 6,944,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | St Augustine | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | St Augustine | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | St Augustine II        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 0      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 0      
Gross Amount, Buildings and Fixtures 13,394,000      
Total 13,394,000      
Accumulated Depreciation (2,373,000)      
Net $ 11,021,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | St Augustine II | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | St Augustine II | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Tattersall at Tapestry Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,417,000      
Initial Cost Buildings and Fixtures 36,069,000      
Gross Amount, Land 6,417,000      
Gross Amount, Buildings and Fixtures 36,680,000      
Total 43,097,000      
Accumulated Depreciation (5,716,000)      
Net $ 37,381,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Tattersall at Tapestry Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Tattersall at Tapestry Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Woodhollow        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,686,000      
Initial Cost Buildings and Fixtures 15,179,000      
Gross Amount, Land 1,678,000      
Gross Amount, Buildings and Fixtures 25,401,000      
Total 27,079,000      
Accumulated Depreciation (16,371,000)      
Net $ 10,708,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Woodhollow | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Woodhollow | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Lakeland        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,254,000      
Initial Cost Buildings and Fixtures 20,452,000      
Gross Amount, Land 1,221,000      
Gross Amount, Buildings and Fixtures 29,288,000      
Total 30,509,000      
Accumulated Depreciation (17,958,000)      
Net $ 12,551,000      
Total Residential Properties | Paddock Club Lakeland | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Lakeland | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Lake Mary        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,780,000      
Initial Cost Buildings and Fixtures 33,543,000      
Gross Amount, Land 5,040,000      
Gross Amount, Buildings and Fixtures 45,604,000      
Total 50,644,000      
Accumulated Depreciation (4,134,000)      
Net $ 46,510,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Colonial Grand at Lake Mary | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Lake Mary | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Town Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 32,938,000      
Initial Cost Land 5,742,000      
Initial Cost Buildings and Fixtures 56,562,000      
Gross Amount, Land 5,742,000      
Gross Amount, Buildings and Fixtures 58,176,000      
Total 63,918,000      
Accumulated Depreciation (5,985,000)      
Net $ 57,933,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Colonial Grand at Town Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Town Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Town Park Reserve        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,481,000      
Initial Cost Buildings and Fixtures 10,311,000      
Gross Amount, Land 3,481,000      
Gross Amount, Buildings and Fixtures 10,499,000      
Total 13,980,000      
Accumulated Depreciation (1,102,000)      
Net $ 12,878,000      
Date of Construction Dec. 31, 2004      
Total Residential Properties | Colonial Grand at Town Park Reserve | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Town Park Reserve | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Retreat at Lake Nona        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 7,880,000      
Initial Cost Buildings and Fixtures 41,175,000      
Gross Amount, Land 7,880,000      
Gross Amount, Buildings and Fixtures 43,271,000      
Total 51,151,000      
Accumulated Depreciation (5,133,000)      
Net $ 46,018,000      
Date of Construction Dec. 31, 2006      
Total Residential Properties | Retreat at Lake Nona | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Retreat at Lake Nona | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Heather Glen        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,662,000      
Initial Cost Buildings and Fixtures 56,988,000      
Gross Amount, Land 4,662,000      
Gross Amount, Buildings and Fixtures 59,391,000      
Total 64,053,000      
Accumulated Depreciation (5,553,000)      
Net $ 58,500,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Colonial Grand at Heather Glen | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Heather Glen | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | The Club at Panama Beach        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 898,000      
Initial Cost Buildings and Fixtures 14,276,000      
Gross Amount, Land 893,000      
Gross Amount, Buildings and Fixtures 18,376,000      
Total 19,269,000      
Accumulated Depreciation (9,512,000)      
Net $ 9,757,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | The Club at Panama Beach | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | The Club at Panama Beach | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Twin Lakes        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 25,044,000      
Initial Cost Land 3,091,000      
Initial Cost Buildings and Fixtures 47,793,000      
Gross Amount, Land 3,091,000      
Gross Amount, Buildings and Fixtures 48,769,000      
Total 51,860,000      
Accumulated Depreciation (4,824,000)      
Net $ 47,036,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Colonial Village at Twin Lakes | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Twin Lakes | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Tallahassee        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 530,000      
Initial Cost Buildings and Fixtures 4,805,000      
Gross Amount, Land 1,480,000      
Gross Amount, Buildings and Fixtures 19,500,000      
Total 20,980,000      
Accumulated Depreciation (11,784,000)      
Net $ 9,196,000      
Date of Construction Dec. 31, 1992      
Total Residential Properties | Paddock Club Tallahassee | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Tallahassee | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Verandas at Southwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,345,000      
Initial Cost Land 3,600,000      
Initial Cost Buildings and Fixtures 25,914,000      
Gross Amount, Land 3,600,000      
Gross Amount, Buildings and Fixtures 26,029,000      
Total 29,629,000      
Accumulated Depreciation (1,260,000)      
Net $ 28,369,000      
Date of Construction Dec. 31, 2003      
Total Residential Properties | Verandas at Southwood [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Verandas at Southwood [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Belmere        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 852,000      
Initial Cost Buildings and Fixtures 7,667,000      
Gross Amount, Land 852,000      
Gross Amount, Buildings and Fixtures 13,949,000      
Total 14,801,000      
Accumulated Depreciation (9,790,000)      
Net $ 5,011,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Belmere | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Belmere | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Links at Carrollwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 817,000      
Initial Cost Buildings and Fixtures 7,355,000      
Cost Capitalized subsequent to Acquisition 5,649,000      
Gross Amount, Land 927,000      
Gross Amount, Buildings and Fixtures 13,004,000      
Total 13,931,000      
Accumulated Depreciation (8,014,000)      
Net $ 5,917,000      
Date of Construction Dec. 31, 1980      
Total Residential Properties | Links at Carrollwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Links at Carrollwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Village Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 2,738,000      
Initial Cost Buildings and Fixtures 19,055,000      
Gross Amount, Land 2,891,000      
Gross Amount, Buildings and Fixtures 21,052,000      
Total 23,943,000      
Accumulated Depreciation (5,296,000)      
Net $ 18,647,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Village Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Village Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Hampton Preserve        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,233,000      
Initial Cost Buildings and Fixtures 69,535,000      
Gross Amount, Land 6,233,000      
Gross Amount, Buildings and Fixtures 70,285,000      
Total 76,518,000      
Accumulated Depreciation (6,483,000)      
Net $ 70,035,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Colonial Grand at Hampton Preserve | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Hampton Preserve | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Seven Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,720,000      
Initial Cost Land 3,051,000      
Initial Cost Buildings and Fixtures 42,768,000      
Gross Amount, Land 3,051,000      
Gross Amount, Buildings and Fixtures 43,509,000      
Total 46,560,000      
Accumulated Depreciation (4,045,000)      
Net $ 42,515,000      
Date of Construction Dec. 31, 2004      
Total Residential Properties | Colonial Grand at Seven Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Seven Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Windermere        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,711,000      
Initial Cost Buildings and Fixtures 36,710,000      
Gross Amount, Land 2,711,000      
Gross Amount, Buildings and Fixtures 37,202,000      
Total 39,913,000      
Accumulated Depreciation (3,377,000)      
Net $ 36,536,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Colonial Grand at Windermere | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Windermere | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Park Crest At Innisbrook        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 28,419,000      
Initial Cost Land 6,900,000      
Initial Cost Buildings and Fixtures 26,613,000      
Gross Amount, Land 6,900,000      
Gross Amount, Buildings and Fixtures 27,545,000      
Total 34,445,000      
Accumulated Depreciation (6,576,000)      
Net $ 27,869,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Park Crest At Innisbrook | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Park Crest At Innisbrook | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Allure at Brookwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 11,168,000      
Initial Cost Buildings and Fixtures 52,758,000      
Gross Amount, Land 11,168,000      
Gross Amount, Buildings and Fixtures 55,718,000      
Total 66,886,000      
Accumulated Depreciation (6,650,000)      
Net $ 60,236,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Allure at Brookwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Allure at Brookwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Allure in Buckhead Village Residential        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 8,633,000      
Initial Cost Buildings and Fixtures 19,844,000      
Gross Amount, Land 8,633,000      
Gross Amount, Buildings and Fixtures 24,767,000      
Total 33,400,000      
Accumulated Depreciation (3,370,000)      
Net $ 30,030,000      
Date of Construction Dec. 31, 2002      
Total Residential Properties | Allure in Buckhead Village Residential | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Allure in Buckhead Village Residential | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Sanctuary At Oglethorpe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,875,000      
Initial Cost Buildings and Fixtures 31,441,000      
Gross Amount, Land 6,875,000      
Gross Amount, Buildings and Fixtures 34,893,000      
Total 41,768,000      
Accumulated Depreciation (9,621,000)      
Net $ 32,147,000      
Date of Construction Dec. 31, 1994      
Total Residential Properties | Sanctuary At Oglethorpe [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Sanctuary At Oglethorpe [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Terraces at Fieldstone        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,284,000      
Initial Cost Buildings and Fixtures 15,819,000      
Gross Amount, Land 1,284,000      
Gross Amount, Buildings and Fixtures 18,696,000      
Total 19,980,000      
Accumulated Depreciation (8,587,000)      
Net $ 11,393,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Terraces at Fieldstone | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Terraces at Fieldstone | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Prescott        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,840,000      
Initial Cost Buildings and Fixtures 24,011,000      
Gross Amount, Land 3,840,000      
Gross Amount, Buildings and Fixtures 27,019,000      
Total 30,859,000      
Accumulated Depreciation (10,837,000)      
Net $ 20,022,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Prescott | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Prescott | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Berkeley Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,960,000      
Initial Cost Buildings and Fixtures 15,707,000      
Gross Amount, Land 1,960,000      
Gross Amount, Buildings and Fixtures 16,577,000      
Total 18,537,000      
Accumulated Depreciation (1,896,000)      
Net $ 16,641,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Colonial Grand at Berkeley Lake | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Berkeley Lake | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lake Lanier Club I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,560,000      
Initial Cost Buildings and Fixtures 22,611,000      
Gross Amount, Land 3,560,000      
Gross Amount, Buildings and Fixtures 26,997,000      
Total 30,557,000      
Accumulated Depreciation (10,294,000)      
Net $ 20,263,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Lake Lanier Club I [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lake Lanier Club I [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at River Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 11,680,000      
Initial Cost Land 4,360,000      
Initial Cost Buildings and Fixtures 13,579,000      
Gross Amount, Land 4,360,000      
Gross Amount, Buildings and Fixtures 14,540,000      
Total 18,900,000      
Accumulated Depreciation (2,105,000)      
Net $ 16,795,000      
Date of Construction Dec. 31, 1992      
Total Residential Properties | Colonial Grand at River Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at River Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lake Lanier Club II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,150,000      
Initial Cost Buildings and Fixtures 18,383,000      
Gross Amount, Land 3,150,000      
Gross Amount, Buildings and Fixtures 20,551,000      
Total 23,701,000      
Accumulated Depreciation (7,717,000)      
Net $ 15,984,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Lake Lanier Club II [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lake Lanier Club II [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at River Plantation        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,059,000      
Initial Cost Buildings and Fixtures 19,158,000      
Gross Amount, Land 2,059,000      
Gross Amount, Buildings and Fixtures 20,233,000      
Total 22,292,000      
Accumulated Depreciation (2,301,000)      
Net $ 19,991,000      
Date of Construction Dec. 31, 1994      
Total Residential Properties | Colonial Grand at River Plantation | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at River Plantation | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at McDaniel Farm        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,985,000      
Initial Cost Buildings and Fixtures 32,206,000      
Gross Amount, Land 3,985,000      
Gross Amount, Buildings and Fixtures 34,022,000      
Total 38,007,000      
Accumulated Depreciation (3,844,000)      
Net $ 34,163,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at McDaniel Farm | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at McDaniel Farm | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Pleasant Hill        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,753,000      
Initial Cost Buildings and Fixtures 32,202,000      
Gross Amount, Land 6,753,000      
Gross Amount, Buildings and Fixtures 34,162,000      
Total 40,915,000      
Accumulated Depreciation (3,725,000)      
Net $ 37,190,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Grand at Pleasant Hill | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Pleasant Hill | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Mount Vernon        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] $ 15,328,000      
Initial Cost Land 6,861,000      
Initial Cost Buildings and Fixtures 23,748,000      
Gross Amount, Land 6,861,000      
Gross Amount, Buildings and Fixtures 24,885,000      
Total 31,746,000      
Accumulated Depreciation (2,327,000)      
Net $ 29,419,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Mount Vernon | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Mount Vernon | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Shiloh        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 30,454,000      
Initial Cost Land 4,864,000      
Initial Cost Buildings and Fixtures 45,893,000      
Gross Amount, Land 4,864,000      
Gross Amount, Buildings and Fixtures 47,576,000      
Total 52,440,000      
Accumulated Depreciation (4,874,000)      
Net $ 47,566,000      
Date of Construction Dec. 31, 2002      
Total Residential Properties | Colonial Grand at Shiloh | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Shiloh | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Milstead Village        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,100,000      
Initial Cost Buildings and Fixtures 29,240,000      
Gross Amount, Land 3,100,000      
Gross Amount, Buildings and Fixtures 29,432,000      
Total 32,532,000      
Accumulated Depreciation (2,998,000)      
Net $ 29,534,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Milstead Village | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Milstead Village | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Barrett Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 19,257,000      
Initial Cost Land 5,661,000      
Initial Cost Buildings and Fixtures 26,186,000      
Gross Amount, Land 5,661,000      
Gross Amount, Buildings and Fixtures 27,432,000      
Total 33,093,000      
Accumulated Depreciation (3,171,000)      
Net $ 29,922,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Colonial Grand at Barrett Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Barrett Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Godley Station        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 12,777,000      
Initial Cost Land 1,800,000      
Initial Cost Buildings and Fixtures 35,454,000      
Gross Amount, Land 1,800,000      
Gross Amount, Buildings and Fixtures 36,798,000      
Total 38,598,000      
Accumulated Depreciation (3,426,000)      
Net $ 35,172,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Colonial Grand at Godley Station | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Godley Station | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Godley Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,750,000      
Initial Cost Buildings and Fixtures 30,893,000      
Gross Amount, Land 1,750,000      
Gross Amount, Buildings and Fixtures 31,576,000      
Total 33,326,000      
Accumulated Depreciation (3,124,000)      
Net $ 30,202,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Village at Godley Lake | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Godley Lake | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Avala at Savannah Quarters        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] $ 0      
Initial Cost Land 1,500,000      
Initial Cost Buildings and Fixtures 24,862,000      
Gross Amount, Land 1,500,000      
Gross Amount, Buildings and Fixtures 25,680,000      
Total 27,180,000      
Accumulated Depreciation (4,130,000)      
Net $ 23,050,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Avala at Savannah Quarters | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Avala at Savannah Quarters | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Georgetown Grove        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,288,000      
Initial Cost Buildings and Fixtures 11,579,000      
Gross Amount, Land 1,288,000      
Gross Amount, Buildings and Fixtures 14,709,000      
Total 15,997,000      
Accumulated Depreciation (8,776,000)      
Net $ 7,221,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Georgetown Grove | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Georgetown Grove | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Hammocks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,441,000      
Initial Cost Buildings and Fixtures 36,863,000      
Gross Amount, Land 2,441,000      
Gross Amount, Buildings and Fixtures 38,493,000      
Total 40,934,000      
Accumulated Depreciation (3,607,000)      
Net $ 37,327,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Hammocks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Hammocks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Haven at Prairie Trace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,500,000      
Initial Cost Buildings and Fixtures 40,614,000      
Gross Amount, Land 3,500,000      
Gross Amount, Buildings and Fixtures 40,864,000      
Total 44,364,000      
Accumulated Depreciation (434,000)      
Net $ 43,930,000      
Date of Construction Dec. 31, 2015      
Total Residential Properties | Haven at Prairie Trace [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Haven at Prairie Trace [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Grand Reserve Lexington [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Grand Reserve Lexington [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Greentree        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,710,000      
Initial Cost Buildings and Fixtures 10,494,000      
Gross Amount, Land 1,710,000      
Gross Amount, Buildings and Fixtures 11,105,000      
Total 12,815,000      
Accumulated Depreciation (1,377,000)      
Net $ 11,438,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Colonial Village at Greentree | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Greentree | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Grand Reserve at Pinnacle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,024,000      
Initial Cost Buildings and Fixtures 31,525,000      
Gross Amount, Land 2,024,000      
Gross Amount, Buildings and Fixtures 35,789,000      
Total 37,813,000      
Accumulated Depreciation (15,170,000)      
Net $ 22,643,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Colonial Village at Huntington        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,521,000      
Initial Cost Buildings and Fixtures 8,223,000      
Gross Amount, Land 2,521,000      
Gross Amount, Buildings and Fixtures 8,523,000      
Total 11,044,000      
Accumulated Depreciation (931,000)      
Net $ 10,113,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Colonial Village at Huntington | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Huntington | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Marsh Cove        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,231,000      
Initial Cost Buildings and Fixtures 8,555,000      
Gross Amount, Land 5,231,000      
Gross Amount, Buildings and Fixtures 9,027,000      
Total 14,258,000      
Accumulated Depreciation (1,161,000)      
Net $ 13,097,000      
Date of Construction Dec. 31, 1983      
Total Residential Properties | Colonial Village at Marsh Cove | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Marsh Cove | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Oaks at Wilmington Island        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,910,000      
Initial Cost Buildings and Fixtures 25,315,000      
Gross Amount, Land 2,910,000      
Gross Amount, Buildings and Fixtures 28,364,000      
Total 31,274,000      
Accumulated Depreciation (9,317,000)      
Net $ 21,957,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Oaks at Wilmington Island | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Oaks at Wilmington Island | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Highlands of West Village I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 41,075,000      
Initial Cost Land 9,052,000      
Initial Cost Buildings and Fixtures 43,395,000      
Gross Amount, Land 9,052,000      
Gross Amount, Buildings and Fixtures 47,772,000      
Total 56,824,000      
Accumulated Depreciation (1,897,000)      
Net $ 54,927,000      
Date of Construction Dec. 31, 2006      
Total Residential Properties | Highlands of West Village I [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Highlands of West Village I [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Highlands of West Village II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,358,000      
Initial Cost Buildings and Fixtures 30,338,000      
Gross Amount, Land 5,358,000      
Gross Amount, Buildings and Fixtures 30,373,000      
Total 35,731,000      
Accumulated Depreciation (1,196,000)      
Net $ 34,535,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Highlands of West Village II [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Highlands of West Village II [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Terraces At Townelake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,331,000      
Initial Cost Buildings and Fixtures 11,918,000      
Gross Amount, Land 3,019,000      
Gross Amount, Buildings and Fixtures 34,383,000      
Total 37,402,000      
Accumulated Depreciation (18,398,000)      
Net $ 19,004,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Terraces At Townelake [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Terraces At Townelake [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Residences at Burlington Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 4,000,000      
Initial Cost Buildings and Fixtures 42,144,000      
Gross Amount, Land 4,000,000      
Gross Amount, Buildings and Fixtures 42,455,000      
Total 46,455,000      
Accumulated Depreciation (1,086,000)      
Net $ 45,369,000      
Total Residential Properties | Residences at Burlington Creek [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Residences at Burlington Creek [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lakepointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 411,000      
Initial Cost Buildings and Fixtures 3,699,000      
Gross Amount, Land 411,000      
Gross Amount, Buildings and Fixtures 6,312,000      
Total 6,723,000      
Accumulated Depreciation (4,434,000)      
Net $ 2,289,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Lakepointe [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lakepointe [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 750,000      
Initial Cost Buildings and Fixtures 8,795,000      
Gross Amount, Land 750,000      
Gross Amount, Buildings and Fixtures 8,795,000      
Total 9,545,000      
Accumulated Depreciation 0      
Net $ 9,545,000      
Date of Construction Dec. 31, 2014      
Total Residential Properties | The Denton [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | The Denton [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Mansion [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 694,000      
Initial Cost Buildings and Fixtures 6,242,000      
Gross Amount, Land 694,000      
Gross Amount, Buildings and Fixtures 9,967,000      
Total 10,661,000      
Accumulated Depreciation (6,972,000)      
Net $ 3,689,000      
Date of Construction Dec. 31, 1989      
Total Residential Properties | Mansion [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Mansion [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 900,000      
Initial Cost Buildings and Fixtures 8,097,000      
Gross Amount, Land 900,000      
Gross Amount, Buildings and Fixtures 13,147,000      
Total 14,047,000      
Accumulated Depreciation (9,171,000)      
Net $ 4,876,000      
Date of Construction Dec. 31, 1989      
Total Residential Properties | Village [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Village [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Stonemill Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,169,000      
Initial Cost Buildings and Fixtures 10,518,000      
Gross Amount, Land 1,169,000      
Gross Amount, Buildings and Fixtures 20,567,000      
Total 21,736,000      
Accumulated Depreciation (13,554,000)      
Net $ 8,182,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Stonemill Village [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Stonemill Village [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Crosswinds [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,535,000      
Initial Cost Buildings and Fixtures 13,826,000      
Gross Amount, Land 1,535,000      
Gross Amount, Buildings and Fixtures 19,574,000      
Total 21,109,000      
Accumulated Depreciation (12,927,000)      
Net $ 8,182,000      
Date of Construction Dec. 31, 1989      
Total Residential Properties | Crosswinds [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Crosswinds [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Pear Orchard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,351,000      
Initial Cost Buildings and Fixtures 12,168,000      
Gross Amount, Land 1,351,000      
Gross Amount, Buildings and Fixtures 21,223,000      
Total 22,574,000      
Accumulated Depreciation (14,512,000)      
Net $ 8,062,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Pear Orchard [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Pear Orchard [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Reflection Pointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 710,000      
Initial Cost Buildings and Fixtures 8,770,000      
Gross Amount, Land 848,000      
Gross Amount, Buildings and Fixtures 17,507,000      
Total 18,355,000      
Accumulated Depreciation (11,209,000)      
Net $ 7,146,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Reflection Pointe [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Reflection Pointe [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lakeshore Landing [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 676,000      
Initial Cost Buildings and Fixtures 6,284,000      
Gross Amount, Land 676,000      
Gross Amount, Buildings and Fixtures 9,245,000      
Total 9,921,000      
Accumulated Depreciation (4,138,000)      
Net $ 5,783,000      
Date of Construction Dec. 31, 1974      
Total Residential Properties | Lakeshore Landing [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lakeshore Landing [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Market Station [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,814,000      
Initial Cost Buildings and Fixtures 46,241,000      
Gross Amount, Land 5,814,000      
Gross Amount, Buildings and Fixtures 46,993,000      
Total 52,807,000      
Accumulated Depreciation (5,232,000)      
Net $ 47,575,000      
Date of Construction Dec. 31, 2010      
Total Residential Properties | Market Station [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Market Station [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Desert Vista [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 4,091,000      
Initial Cost Buildings and Fixtures 29,826,000      
Gross Amount, Land 4,091,000      
Gross Amount, Buildings and Fixtures 30,459,000      
Total 34,550,000      
Accumulated Depreciation (3,094,000)      
Net $ 31,456,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Colonial Grand at Desert Vista [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Desert Vista [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Palm Vista [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 4,909,000      
Initial Cost Buildings and Fixtures 25,643,000      
Gross Amount, Land 4,909,000      
Gross Amount, Buildings and Fixtures 26,779,000      
Total 31,688,000      
Accumulated Depreciation (2,806,000)      
Net $ 28,882,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Colonial Grand at Palm Vista [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Palm Vista [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Beaver Creek (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 7,491,000      
Initial Cost Buildings and Fixtures 34,863,000      
Gross Amount, Land 7,491,000      
Gross Amount, Buildings and Fixtures 35,826,000      
Total 43,317,000      
Accumulated Depreciation (3,376,000)      
Net $ 39,941,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Colonial Village at Beaver Creek (Raleigh, NC) [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Beaver Creek (Raleigh, NC) [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Hermitage at Beechtree        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 900,000      
Initial Cost Buildings and Fixtures 8,099,000      
Gross Amount, Land 900,000      
Gross Amount, Buildings and Fixtures 13,451,000      
Total 14,351,000      
Accumulated Depreciation (8,341,000)      
Net $ 6,010,000      
Date of Construction Dec. 31, 1988      
Total Residential Properties | Hermitage at Beechtree | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Hermitage at Beechtree | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Waterford Forest        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 4,000,000      
Initial Cost Buildings and Fixtures 20,250,000      
Gross Amount, Land 4,000,000      
Gross Amount, Buildings and Fixtures 23,485,000      
Total 27,485,000      
Accumulated Depreciation (9,018,000)      
Net $ 18,467,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Waterford Forest | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Waterford Forest | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | 1225 South Church I        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,780,000      
Initial Cost Buildings and Fixtures 22,342,000      
Gross Amount, Land 9,612,000      
Gross Amount, Buildings and Fixtures 45,904,000      
Total 55,516,000      
Accumulated Depreciation (4,846,000)      
Net $ 50,670,000      
Date of Construction Dec. 31, 2010      
Total Residential Properties | 1225 South Church I | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | 1225 South Church I | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Ayrsley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,240,000      
Initial Cost Buildings and Fixtures 52,119,000      
Gross Amount, Land 2,481,000      
Gross Amount, Buildings and Fixtures 64,551,000      
Total 67,032,000      
Accumulated Depreciation (5,695,000)      
Net $ 61,337,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Ayrsley [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Ayrsley [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Beverly Crest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Gross Amount, Land $ 3,161,000      
Gross Amount, Buildings and Fixtures 25,778,000      
Total 28,939,000      
Accumulated Depreciation (2,412,000)      
Net $ 26,527,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Grand at Beverly Crest [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Beverly Crest [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Legacy Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,891,000      
Initial Cost Buildings and Fixtures 28,272,000      
Gross Amount, Land 2,891,000      
Gross Amount, Buildings and Fixtures 29,279,000      
Total 32,170,000      
Accumulated Depreciation (2,882,000)      
Net $ 29,288,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Colonial Grand at Legacy Park [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Legacy Park [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Mallard Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 15,630,000      
Initial Cost Land 4,591,000      
Initial Cost Buildings and Fixtures 27,713,000      
Gross Amount, Land 4,591,000      
Gross Amount, Buildings and Fixtures 28,301,000      
Total 32,892,000      
Accumulated Depreciation (2,840,000)      
Net $ 30,052,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Colonial Grand at Mallard Creek [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Mallard Creek [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at South Tryon        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,260,000      
Initial Cost Buildings and Fixtures 19,489,000      
Gross Amount, Land 2,260,000      
Gross Amount, Buildings and Fixtures 20,215,000      
Total 22,475,000      
Accumulated Depreciation (1,998,000)      
Net $ 20,477,000      
Date of Construction Dec. 31, 2002      
Total Residential Properties | Colonial Village at South Tryon | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at South Tryon | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Stone Point        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,141,000      
Initial Cost Buildings and Fixtures 11,564,000      
Gross Amount, Land 2,141,000      
Gross Amount, Buildings and Fixtures 12,368,000      
Total 14,509,000      
Accumulated Depreciation (1,519,000)      
Net $ 12,990,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Colonial Village at Stone Point | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Stone Point | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Timber Crest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,901,000      
Initial Cost Buildings and Fixtures 17,192,000      
Gross Amount, Land 2,901,000      
Gross Amount, Buildings and Fixtures 17,961,000      
Total 20,862,000      
Accumulated Depreciation (1,642,000)      
Net $ 19,220,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Colonial Village at Timber Crest [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Timber Crest [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Enclave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,461,000      
Initial Cost Buildings and Fixtures 18,984,000      
Gross Amount, Land 1,461,000      
Gross Amount, Buildings and Fixtures 19,337,000      
Total 20,798,000      
Accumulated Depreciation (1,607,000)      
Net $ 19,191,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Enclave [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Enclave [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Cornelius [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,571,000      
Initial Cost Buildings and Fixtures 29,151,000      
Gross Amount, Land 4,571,000      
Gross Amount, Buildings and Fixtures 29,661,000      
Total 34,232,000      
Accumulated Depreciation (3,049,000)      
Net $ 31,183,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Colonial Grand at Cornelius [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Cornelius [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Patterson Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 15,361,000      
Initial Cost Land 2,590,000      
Initial Cost Buildings and Fixtures 27,126,000      
Gross Amount, Land 2,590,000      
Gross Amount, Buildings and Fixtures 28,300,000      
Total 30,890,000      
Accumulated Depreciation (2,704,000)      
Net $ 28,186,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Patterson Place [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Patterson Place [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Woodlake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,741,000      
Initial Cost Buildings and Fixtures 17,686,000      
Gross Amount, Land 2,741,000      
Gross Amount, Buildings and Fixtures 18,407,000      
Total 21,148,000      
Accumulated Depreciation (1,927,000)      
Net $ 19,221,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Village at Woodlake [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Woodlake [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Deerfield [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,271,000      
Initial Cost Buildings and Fixtures 15,609,000      
Gross Amount, Land 3,271,000      
Gross Amount, Buildings and Fixtures 16,287,000      
Total 19,558,000      
Accumulated Depreciation (1,919,000)      
Net $ 17,639,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Colonial Village at Deerfield [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Deerfield [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Research Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,201,000      
Initial Cost Buildings and Fixtures 37,682,000      
Gross Amount, Land 4,201,000      
Gross Amount, Buildings and Fixtures 38,590,000      
Total 42,791,000      
Accumulated Depreciation (3,865,000)      
Net $ 38,926,000      
Date of Construction Dec. 31, 2002      
Total Residential Properties | Colonial Grand at Research Park [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Research Park [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Greystone [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] $ 14,180,000      
Initial Cost Land 4,120,000      
Initial Cost Buildings and Fixtures 25,974,000      
Gross Amount, Land 4,120,000      
Gross Amount, Buildings and Fixtures 27,184,000      
Total 31,304,000      
Accumulated Depreciation (2,467,000)      
Net $ 28,837,000      
Total Residential Properties | Colonial Village at Greystone [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Greystone [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Autumn Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,182,000      
Initial Cost Buildings and Fixtures 26,214,000      
Gross Amount, Land 4,182,000      
Gross Amount, Buildings and Fixtures 27,181,000      
Total 31,363,000      
Accumulated Depreciation (2,506,000)      
Net $ 28,857,000      
Total Residential Properties | Colonial Grand at Autumn Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Autumn Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Huntersville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 14,843,000      
Initial Cost Land 4,251,000      
Initial Cost Buildings and Fixtures 31,948,000      
Gross Amount, Land 4,251,000      
Gross Amount, Buildings and Fixtures 32,810,000      
Total 37,061,000      
Accumulated Depreciation (3,255,000)      
Net $ 33,806,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Huntersville [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Huntersville [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Matthews [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 13,587,000      
Initial Cost Land 3,071,000      
Initial Cost Buildings and Fixtures 21,830,000      
Gross Amount, Land 3,071,000      
Gross Amount, Buildings and Fixtures 24,338,000      
Total 27,409,000      
Accumulated Depreciation (2,611,000)      
Net $ 24,798,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Village at Matthews [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Matthews [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Matthews Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,690,000      
Initial Cost Buildings and Fixtures 28,536,000      
Gross Amount, Land 3,690,000      
Gross Amount, Buildings and Fixtures 29,548,000      
Total 33,238,000      
Accumulated Depreciation (2,818,000)      
Net $ 30,420,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Matthews Commons [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Matthews Commons [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Arringdon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 19,319,000      
Initial Cost Land 6,401,000      
Initial Cost Buildings and Fixtures 31,134,000      
Gross Amount, Land 6,401,000      
Gross Amount, Buildings and Fixtures 32,065,000      
Total 38,466,000      
Accumulated Depreciation (3,169,000)      
Net $ 35,297,000      
Date of Construction Dec. 31, 2003      
Total Residential Properties | Colonial Grand at Arringdon [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Arringdon [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Brier Creek (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 25,490,000      
Initial Cost Land 7,372,000      
Initial Cost Buildings and Fixtures 50,202,000      
Gross Amount, Land 7,372,000      
Gross Amount, Buildings and Fixtures 51,069,000      
Total 58,441,000      
Accumulated Depreciation (4,812,000)      
Net $ 53,629,000      
Date of Construction Dec. 31, 2010      
Total Residential Properties | Colonial Grand at Brier Creek (Raleigh, NC) [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Brier Creek (Raleigh, NC) [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Brier Falls (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,572,000      
Initial Cost Buildings and Fixtures 48,910,000      
Gross Amount, Land 6,572,000      
Gross Amount, Buildings and Fixtures 49,657,000      
Total 56,229,000      
Accumulated Depreciation (4,611,000)      
Net $ 51,618,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Brier Falls (Raleigh, NC) [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Brier Falls (Raleigh, NC) [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Crabtree Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 10,532,000      
Initial Cost Land 2,241,000      
Initial Cost Buildings and Fixtures 18,434,000      
Gross Amount, Land 2,241,000      
Gross Amount, Buildings and Fixtures 19,359,000      
Total 21,600,000      
Accumulated Depreciation (1,746,000)      
Net $ 19,854,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Crabtree Valley [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Crabtree Valley [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Hue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,690,000      
Initial Cost Buildings and Fixtures 29,910,000      
Gross Amount, Land 3,690,000      
Gross Amount, Buildings and Fixtures 31,460,000      
Total 35,150,000      
Accumulated Depreciation (4,923,000)      
Net $ 30,227,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Hue [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Hue [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Trinity Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 29,725,000      
Initial Cost Land 5,232,000      
Initial Cost Buildings and Fixtures 45,138,000      
Gross Amount, Land 5,232,000      
Gross Amount, Buildings and Fixtures 46,615,000      
Total 51,847,000      
Accumulated Depreciation (4,722,000)      
Net $ 47,125,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Colonial Grand at Trinity Commons [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Trinity Commons [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Preserve At Brier Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,850,000      
Initial Cost Buildings and Fixtures 21,980,000      
Gross Amount, Land 5,831,000      
Gross Amount, Buildings and Fixtures 46,158,000      
Total 51,989,000      
Accumulated Depreciation (13,195,000)      
Net $ 38,794,000      
Date of Construction Dec. 31, 2004      
Total Residential Properties | Preserve At Brier Creek [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Preserve At Brier Creek [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Providence At Brier Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,695,000      
Initial Cost Buildings and Fixtures 29,007,000      
Gross Amount, Land 4,695,000      
Gross Amount, Buildings and Fixtures 30,431,000      
Total 35,126,000      
Accumulated Depreciation (7,898,000)      
Net $ 27,228,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Providence At Brier Creek [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Providence At Brier Creek [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Park Haywood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 325,000      
Initial Cost Buildings and Fixtures 2,925,000      
Gross Amount, Land 360,000      
Gross Amount, Buildings and Fixtures 7,937,000      
Total 8,297,000      
Accumulated Depreciation (5,736,000)      
Net $ 2,561,000      
Date of Construction Dec. 31, 1983      
Total Residential Properties | Park Haywood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Park Haywood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Spring Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 597,000      
Initial Cost Buildings and Fixtures 5,374,000      
Gross Amount, Land 583,000      
Gross Amount, Buildings and Fixtures 8,951,000      
Total 9,534,000      
Accumulated Depreciation (6,011,000)      
Net $ 3,523,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Spring Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Spring Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Glen Eagles [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,400,000      
Initial Cost Buildings and Fixtures 15,002,000      
Gross Amount, Land 3,400,000      
Gross Amount, Buildings and Fixtures 16,278,000      
Total 19,678,000      
Accumulated Depreciation (1,649,000)      
Net $ 18,029,000      
Date of Construction Dec. 31, 1990      
Total Residential Properties | Glen Eagles [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Glen Eagles [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Mill Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,351,000      
Initial Cost Buildings and Fixtures 7,354,000      
Gross Amount, Land 2,351,000      
Gross Amount, Buildings and Fixtures 7,900,000      
Total 10,251,000      
Accumulated Depreciation (876,000)      
Net $ 9,375,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Colonial Village at Mill Creek [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Mill Creek [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Greenville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,200,000      
Initial Cost Buildings and Fixtures 10,800,000      
Gross Amount, Land 1,200,000      
Gross Amount, Buildings and Fixtures 13,169,000      
Total 14,369,000      
Accumulated Depreciation (8,159,000)      
Net $ 6,210,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Paddock Club Greenville [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Greenville [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Howell Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,304,000      
Initial Cost Buildings and Fixtures 11,740,000      
Gross Amount, Land 1,304,000      
Gross Amount, Buildings and Fixtures 16,179,000      
Total 17,483,000      
Accumulated Depreciation (10,505,000)      
Net $ 6,978,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Howell Commons [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Howell Commons [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Highland Ridge [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 482,000      
Initial Cost Buildings and Fixtures 4,337,000      
Gross Amount, Land 482,000      
Gross Amount, Buildings and Fixtures 7,015,000      
Total 7,497,000      
Accumulated Depreciation (4,502,000)      
Net $ 2,995,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Highland Ridge [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Highland Ridge [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Windsor Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,321,000      
Initial Cost Buildings and Fixtures 14,163,000      
Gross Amount, Land 1,321,000      
Gross Amount, Buildings and Fixtures 15,440,000      
Total 16,761,000      
Accumulated Depreciation (1,715,000)      
Net $ 15,046,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Colonial Village at Windsor Place [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Windsor Place [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Woodwinds [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,968,000      
Initial Cost Buildings and Fixtures 19,928,000      
Gross Amount, Land 1,968,000      
Gross Amount, Buildings and Fixtures 23,174,000      
Total 25,142,000      
Accumulated Depreciation (7,948,000)      
Net $ 17,194,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Runaway Bay        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,085,000      
Initial Cost Buildings and Fixtures 7,269,000      
Gross Amount, Land 1,097,000      
Gross Amount, Buildings and Fixtures 14,158,000      
Total 15,255,000      
Accumulated Depreciation (9,350,000)      
Net $ 5,905,000      
Date of Construction Dec. 31, 1988      
Total Residential Properties | Runaway Bay | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Runaway Bay | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Commerce Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,780,000      
Initial Cost Buildings and Fixtures 33,966,000      
Gross Amount, Land 2,780,000      
Gross Amount, Buildings and Fixtures 34,719,000      
Total 37,499,000      
Accumulated Depreciation (3,313,000)      
Net $ 34,186,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Commerce Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Commerce Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | 535 Brookwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 12,889,000      
Initial Cost Land 1,216,000      
Initial Cost Buildings and Fixtures 18,666,000      
Gross Amount, Land 1,216,000      
Gross Amount, Buildings and Fixtures 19,517,000      
Total 20,733,000      
Accumulated Depreciation (3,769,000)      
Net $ 16,964,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | 535 Brookwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | 535 Brookwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Park Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 723,000      
Initial Cost Buildings and Fixtures 6,504,000      
Gross Amount, Land 723,000      
Gross Amount, Buildings and Fixtures 9,878,000      
Total 10,601,000      
Accumulated Depreciation (6,336,000)      
Net $ 4,265,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Park Place | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Park Place | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Farmington Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,800,000      
Initial Cost Buildings and Fixtures 26,295,000      
Gross Amount, Land 2,800,000      
Gross Amount, Buildings and Fixtures 27,492,000      
Total 30,292,000      
Accumulated Depreciation (7,772,000)      
Net $ 22,520,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Farmington Village [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Farmington Village [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Waters Edge        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,103,000      
Initial Cost Buildings and Fixtures 9,187,000      
Gross Amount, Land 2,103,000      
Gross Amount, Buildings and Fixtures 11,166,000      
Total 13,269,000      
Accumulated Depreciation (1,364,000)      
Net $ 11,905,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Colonial Village at Waters Edge | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Waters Edge | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Hamilton Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,131,000      
Initial Cost Buildings and Fixtures 10,632,000      
Gross Amount, Land 1,131,000      
Gross Amount, Buildings and Fixtures 14,958,000      
Total 16,089,000      
Accumulated Depreciation (6,593,000)      
Net $ 9,496,000      
Date of Construction Dec. 31, 1989      
Total Residential Properties | Hamilton Pointe | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Hamilton Pointe | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Hidden Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 972,000      
Initial Cost Buildings and Fixtures 8,954,000      
Gross Amount, Land 972,000      
Gross Amount, Buildings and Fixtures 11,831,000      
Total 12,803,000      
Accumulated Depreciation (5,329,000)      
Net $ 7,474,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Hidden Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Hidden Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Steeplechase        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 217,000      
Initial Cost Buildings and Fixtures 1,957,000      
Gross Amount, Land 217,000      
Gross Amount, Buildings and Fixtures 5,307,000      
Total 5,524,000      
Accumulated Depreciation (3,676,000)      
Net $ 1,848,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Steeplechase | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Steeplechase | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Windridge        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 817,000      
Initial Cost Buildings and Fixtures 7,416,000      
Gross Amount, Land 817,000      
Gross Amount, Buildings and Fixtures 11,878,000      
Total 12,695,000      
Accumulated Depreciation (7,363,000)      
Net $ 5,332,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Windridge | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Windridge | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Kirby Station        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,148,000      
Initial Cost Buildings and Fixtures 10,337,000      
Gross Amount, Land 1,148,000      
Gross Amount, Buildings and Fixtures 20,722,000      
Total 21,870,000      
Accumulated Depreciation (12,916,000)      
Net $ 8,954,000      
Date of Construction Dec. 31, 1978      
Total Residential Properties | Kirby Station | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Kirby Station | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lincoln on the Green        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 1,498,000      
Initial Cost Buildings and Fixtures 20,483,000      
Gross Amount, Land 1,498,000      
Gross Amount, Buildings and Fixtures 36,347,000      
Total 37,845,000      
Accumulated Depreciation (23,701,000)      
Net $ 14,144,000      
Date of Construction Dec. 31, 1992      
Total Residential Properties | Lincoln on the Green | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lincoln on the Green | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Park Estate        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 178,000      
Initial Cost Buildings and Fixtures 1,141,000      
Gross Amount, Land 178,000      
Gross Amount, Buildings and Fixtures 6,188,000      
Total 6,366,000      
Accumulated Depreciation (4,826,000)      
Net $ 1,540,000      
Date of Construction Dec. 31, 1974      
Total Residential Properties | Park Estate | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Park Estate | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Reserve at Dexter Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 1,260,000      
Initial Cost Buildings and Fixtures 16,043,000      
Gross Amount, Land 3,407,000      
Gross Amount, Buildings and Fixtures 55,456,000      
Total 58,863,000      
Accumulated Depreciation (22,945,000)      
Net $ 35,918,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Reserve at Dexter Lake | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Reserve at Dexter Lake | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Paddock Club Murfreesboro        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 915,000      
Initial Cost Buildings and Fixtures 14,774,000      
Gross Amount, Land 915,000      
Gross Amount, Buildings and Fixtures 17,917,000      
Total 18,832,000      
Accumulated Depreciation (8,310,000)      
Net $ 10,522,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Paddock Club Murfreesboro | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Paddock Club Murfreesboro | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Aventura at Indian Lake Village        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,950,000      
Initial Cost Buildings and Fixtures 28,053,000      
Gross Amount, Land 4,950,000      
Gross Amount, Buildings and Fixtures 29,088,000      
Total 34,038,000      
Accumulated Depreciation (4,350,000)      
Net $ 29,688,000      
Date of Construction Dec. 31, 2010      
Total Residential Properties | Aventura at Indian Lake Village | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Aventura at Indian Lake Village | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Avondale at Kennesaw        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,762,000      
Initial Cost Land 3,456,000      
Initial Cost Buildings and Fixtures 22,443,000      
Gross Amount, Land 3,456,000      
Gross Amount, Buildings and Fixtures 23,862,000      
Total 27,318,000      
Accumulated Depreciation (4,607,000)      
Net $ 22,711,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Avondale at Kennesaw | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Avondale at Kennesaw | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Brentwood Downs        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,193,000      
Initial Cost Buildings and Fixtures 10,739,000      
Gross Amount, Land 1,191,000      
Gross Amount, Buildings and Fixtures 18,107,000      
Total 19,298,000      
Accumulated Depreciation (12,097,000)      
Net $ 7,201,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Brentwood Downs | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Brentwood Downs | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Bellevue        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 22,086,000      
Initial Cost Land 8,622,000      
Initial Cost Buildings and Fixtures 34,229,000      
Gross Amount, Land 8,622,000      
Gross Amount, Buildings and Fixtures 35,433,000      
Total 44,055,000      
Accumulated Depreciation (3,697,000)      
Net $ 40,358,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Grand at Bellevue | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Bellevue | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Grand View Nashville        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,963,000      
Initial Cost Buildings and Fixtures 33,673,000      
Gross Amount, Land 2,963,000      
Gross Amount, Buildings and Fixtures 40,493,000      
Total 43,456,000      
Accumulated Depreciation (16,705,000)      
Net $ 26,751,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Grand View Nashville | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Grand View Nashville | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Monthaven Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,736,000      
Initial Cost Buildings and Fixtures 28,902,000      
Gross Amount, Land 2,736,000      
Gross Amount, Buildings and Fixtures 34,369,000      
Total 37,105,000      
Accumulated Depreciation (14,612,000)      
Net $ 22,493,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Monthaven Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Monthaven Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Park at Hermitage        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 1,524,000      
Initial Cost Buildings and Fixtures 14,800,000      
Gross Amount, Land 1,524,000      
Gross Amount, Buildings and Fixtures 24,374,000      
Total 25,898,000      
Accumulated Depreciation (16,152,000)      
Net $ 9,746,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Park at Hermitage | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Park at Hermitage | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Venue at Cool Springs        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 6,670,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 6,670,000      
Gross Amount, Buildings and Fixtures 50,396,000      
Total 57,066,000      
Accumulated Depreciation (4,376,000)      
Net $ 52,690,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Venue at Cool Springs | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Venue at Cool Springs | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Verandas at Sam Ridley        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 21,861,000      
Initial Cost Land 3,350,000      
Initial Cost Buildings and Fixtures 28,308,000      
Gross Amount, Land 3,350,000      
Gross Amount, Buildings and Fixtures 29,654,000      
Total 33,004,000      
Accumulated Depreciation (5,565,000)      
Net $ 27,439,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Verandas at Sam Ridley | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Verandas at Sam Ridley | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Northwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 886,000      
Initial Cost Buildings and Fixtures 8,051,000      
Gross Amount, Land 886,000      
Gross Amount, Buildings and Fixtures 10,920,000      
Total 11,806,000      
Accumulated Depreciation (4,826,000)      
Net $ 6,980,000      
Date of Construction Dec. 31, 1980      
Total Residential Properties | Northwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Northwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Balcones Woods        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,598,000      
Initial Cost Buildings and Fixtures 14,398,000      
Gross Amount, Land 1,598,000      
Gross Amount, Buildings and Fixtures 25,873,000      
Total 27,471,000      
Accumulated Depreciation (16,712,000)      
Net $ 10,759,000      
Date of Construction Dec. 31, 1983      
Total Residential Properties | Balcones Woods | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Balcones Woods | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Canyon Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 15,159,000      
Initial Cost Land 3,621,000      
Initial Cost Buildings and Fixtures 32,137,000      
Gross Amount, Land 3,621,000      
Gross Amount, Buildings and Fixtures 33,232,000      
Total 36,853,000      
Accumulated Depreciation (3,309,000)      
Net $ 33,544,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Canyon Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Canyon Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Canyon Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,778,000      
Initial Cost Buildings and Fixtures 20,201,000      
Gross Amount, Land 3,778,000      
Gross Amount, Buildings and Fixtures 21,351,000      
Total 25,129,000      
Accumulated Depreciation (2,339,000)      
Net $ 22,790,000      
Date of Construction Dec. 31, 2003      
Total Residential Properties | Colonial Grand at Canyon Pointe | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Canyon Pointe | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Double Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,131,000      
Initial Cost Buildings and Fixtures 29,375,000      
Gross Amount, Land 3,131,000      
Gross Amount, Buildings and Fixtures 29,667,000      
Total 32,798,000      
Accumulated Depreciation (3,030,000)      
Net $ 29,768,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Colonial Grand at Double Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Double Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Onion Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,902,000      
Initial Cost Buildings and Fixtures 33,010,000      
Gross Amount, Land 4,902,000      
Gross Amount, Buildings and Fixtures 33,809,000      
Total 38,711,000      
Accumulated Depreciation (3,437,000)      
Net $ 35,274,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Colonial Grand at Onion Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Onion Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Grand Reserve at Sunset Valley        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 3,150,000      
Initial Cost Buildings and Fixtures 11,393,000      
Gross Amount, Land 3,150,000      
Gross Amount, Buildings and Fixtures 14,881,000      
Total 18,031,000      
Accumulated Depreciation (6,087,000)      
Net $ 11,944,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Grand Reserve at Sunset Valley | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Grand Reserve at Sunset Valley | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Quarry Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 26,832,000      
Initial Cost Land 4,621,000      
Initial Cost Buildings and Fixtures 34,461,000      
Gross Amount, Land 4,621,000      
Gross Amount, Buildings and Fixtures 38,224,000      
Total 42,845,000      
Accumulated Depreciation (3,881,000)      
Net $ 38,964,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Village at Quarry Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Quarry Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Wells Branch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,094,000      
Initial Cost Buildings and Fixtures 32,283,000      
Gross Amount, Land 3,388,000      
Gross Amount, Buildings and Fixtures 33,154,000      
Total 36,542,000      
Accumulated Depreciation (3,118,000)      
Net $ 33,424,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Colonial Grand at Wells Branch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Wells Branch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Legacy at Western Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 29,672,000      
Initial Cost Land 9,100,000      
Initial Cost Buildings and Fixtures 49,339,000      
Gross Amount, Land 9,100,000      
Gross Amount, Buildings and Fixtures 46,991,000      
Total 56,091,000      
Accumulated Depreciation (6,084,000)      
Net $ 50,007,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Legacy at Western Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Legacy at Western Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Silverado        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,900,000      
Initial Cost Buildings and Fixtures 24,009,000      
Gross Amount, Land 2,900,000      
Gross Amount, Buildings and Fixtures 26,779,000      
Total 29,679,000      
Accumulated Depreciation (9,211,000)      
Net $ 20,468,000      
Date of Construction Dec. 31, 2003      
Total Residential Properties | Silverado | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Silverado | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Stassney Woods        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,621,000      
Initial Cost Buildings and Fixtures 7,501,000      
Gross Amount, Land 1,621,000      
Gross Amount, Buildings and Fixtures 16,116,000      
Total 17,737,000      
Accumulated Depreciation (9,615,000)      
Net $ 8,122,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Stassney Woods | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Stassney Woods | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Travis Station        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,281,000      
Initial Cost Buildings and Fixtures 6,169,000      
Gross Amount, Land 2,281,000      
Gross Amount, Buildings and Fixtures 13,695,000      
Total 15,976,000      
Accumulated Depreciation (8,840,000)      
Net $ 7,136,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Travis Station | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Travis Station | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Woods, The        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,405,000      
Initial Cost Buildings and Fixtures 12,769,000      
Gross Amount, Land 1,405,000      
Gross Amount, Buildings and Fixtures 20,624,000      
Total 22,029,000      
Accumulated Depreciation (8,796,000)      
Net $ 13,233,000      
Date of Construction Dec. 31, 1977      
Total Residential Properties | Woods, The | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Woods, The | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Shoal Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 22,807,000      
Initial Cost Land 4,982,000      
Initial Cost Buildings and Fixtures 27,377,000      
Gross Amount, Land 4,982,000      
Gross Amount, Buildings and Fixtures 28,991,000      
Total 33,973,000      
Accumulated Depreciation (3,095,000)      
Net $ 30,878,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Village at Shoal Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Shoal Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Willow Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 26,429,000      
Initial Cost Land 3,109,000      
Initial Cost Buildings and Fixtures 33,488,000      
Gross Amount, Land 3,109,000      
Gross Amount, Buildings and Fixtures 37,188,000      
Total 40,297,000      
Accumulated Depreciation (3,652,000)      
Net $ 36,645,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Colonial Village at Willow Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Willow Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Hebron (Dallas, TX) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,231,000      
Initial Cost Buildings and Fixtures 42,237,000      
Gross Amount, Land 4,231,000      
Gross Amount, Buildings and Fixtures 42,742,000      
Total 46,973,000      
Accumulated Depreciation (3,884,000)      
Net $ 43,089,000      
Date of Construction Dec. 31, 2011      
Total Residential Properties | Colonial Grand at Hebron (Dallas, TX) [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Hebron (Dallas, TX) [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Silverado [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,282,000      
Initial Cost Buildings and Fixtures 24,935,000      
Gross Amount, Land 3,282,000      
Gross Amount, Buildings and Fixtures 25,672,000      
Total 28,954,000      
Accumulated Depreciation (2,524,000)      
Net $ 26,430,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Colonial Grand at Silverado [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Silverado [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Silverado Reserve [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,951,000      
Initial Cost Buildings and Fixtures 31,705,000      
Gross Amount, Land 3,951,000      
Gross Amount, Buildings and Fixtures 32,710,000      
Total 36,661,000      
Accumulated Depreciation (3,145,000)      
Net $ 33,516,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Colonial Grand at Silverado Reserve [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Silverado Reserve [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Grand Cypress [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 16,598,000      
Initial Cost Land 3,881,000      
Initial Cost Buildings and Fixtures 24,267,000      
Gross Amount, Land 3,881,000      
Gross Amount, Buildings and Fixtures 24,944,000      
Total 28,825,000      
Accumulated Depreciation (1,731,000)      
Net $ 27,094,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Grand Cypress [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Grand Cypress [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Courtyards at Campbell        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 988,000      
Initial Cost Buildings and Fixtures 8,893,000      
Gross Amount, Land 988,000      
Gross Amount, Buildings and Fixtures 12,906,000      
Total 13,894,000      
Accumulated Depreciation (7,793,000)      
Net $ 6,101,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Courtyards at Campbell | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Courtyards at Campbell | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Deer Run        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,252,000      
Initial Cost Buildings and Fixtures 11,271,000      
Gross Amount, Land 1,252,000      
Gross Amount, Buildings and Fixtures 16,431,000      
Total 17,683,000      
Accumulated Depreciation (10,022,000)      
Net $ 7,661,000      
Date of Construction Dec. 31, 1985      
Total Residential Properties | Deer Run | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Deer Run | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Grand Courtyard        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,730,000      
Initial Cost Buildings and Fixtures 22,240,000      
Gross Amount, Land 2,730,000      
Gross Amount, Buildings and Fixtures 24,860,000      
Total 27,590,000      
Accumulated Depreciation (8,665,000)      
Net $ 18,925,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Grand Courtyard | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Grand Courtyard | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Legends at Lowe's Farm        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,016,000      
Initial Cost Buildings and Fixtures 41,091,000      
Gross Amount, Land 5,016,000      
Gross Amount, Buildings and Fixtures 42,432,000      
Total 47,448,000      
Accumulated Depreciation (6,373,000)      
Net $ 41,075,000      
Date of Construction Dec. 31, 2008      
Total Residential Properties | Legends at Lowe's Farm | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Legends at Lowe's Farm | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Reserve at Medical District        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,050,000      
Initial Cost Buildings and Fixtures 33,779,000      
Gross Amount, Land 4,050,000      
Gross Amount, Buildings and Fixtures 34,667,000      
Total 38,717,000      
Accumulated Depreciation (2,997,000)      
Net $ 35,720,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Colonial Reserve at Medical District | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Reserve at Medical District | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Watermark        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 960,000      
Initial Cost Buildings and Fixtures 14,438,000      
Gross Amount, Land 960,000      
Gross Amount, Buildings and Fixtures 16,557,000      
Total 17,517,000      
Accumulated Depreciation (6,799,000)      
Net $ 10,718,000      
Date of Construction Dec. 31, 2002      
Total Residential Properties | Watermark | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Watermark | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Main Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,821,000      
Initial Cost Buildings and Fixtures 10,960,000      
Gross Amount, Land 1,821,000      
Gross Amount, Buildings and Fixtures 12,164,000      
Total 13,985,000      
Accumulated Depreciation (1,390,000)      
Net $ 12,595,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Colonial Village at Main Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Main Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Bear Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 24,082,000      
Initial Cost Land 6,453,000      
Initial Cost Buildings and Fixtures 30,048,000      
Gross Amount, Land 6,453,000      
Gross Amount, Buildings and Fixtures 31,924,000      
Total 38,377,000      
Accumulated Depreciation (3,494,000)      
Net $ 34,883,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Colonial Grand at Bear Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Bear Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Fairview        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,171,000      
Initial Cost Buildings and Fixtures 35,077,000      
Gross Amount, Land 2,171,000      
Gross Amount, Buildings and Fixtures 35,498,000      
Total 37,669,000      
Accumulated Depreciation (3,195,000)      
Net $ 34,474,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Colonial Grand at Fairview | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Fairview | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | La Valencia at Starwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,931,000      
Initial Cost Land 3,240,000      
Initial Cost Buildings and Fixtures 26,069,000      
Gross Amount, Land 3,240,000      
Gross Amount, Buildings and Fixtures 27,083,000      
Total 30,323,000      
Accumulated Depreciation (5,045,000)      
Net $ 25,278,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | La Valencia at Starwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | La Valencia at Starwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Cityscape at Market Center II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 8,268,000      
Initial Cost Buildings and Fixtures 50,298,000      
Gross Amount, Land 8,268,000      
Gross Amount, Buildings and Fixtures 50,318,000      
Total 58,586,000      
Accumulated Depreciation (107,000)      
Net $ 58,479,000      
Date of Construction Dec. 31, 2015      
Total Residential Properties | Cityscape at Market Center II [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Cityscape at Market Center II [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Reserve at Frisco Bridges        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,968,000      
Initial Cost Buildings and Fixtures 34,018,000      
Gross Amount, Land 1,968,000      
Gross Amount, Buildings and Fixtures 34,849,000      
Total 36,817,000      
Accumulated Depreciation (3,069,000)      
Net $ 33,748,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Colonial Reserve at Frisco Bridges | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Reserve at Frisco Bridges | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Grapevine        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,351,000      
Initial Cost Buildings and Fixtures 29,757,000      
Gross Amount, Land 2,351,000      
Gross Amount, Buildings and Fixtures 32,715,000      
Total 35,066,000      
Accumulated Depreciation (3,153,000)      
Net $ 31,913,000      
Total Residential Properties | Colonial Village at Grapevine | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Grapevine | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Greenwood Forest        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,465,000      
Initial Cost Buildings and Fixtures 23,482,000      
Gross Amount, Land 3,465,000      
Gross Amount, Buildings and Fixtures 23,323,000      
Total 26,788,000      
Accumulated Depreciation (2,180,000)      
Net $ 24,608,000      
Date of Construction Dec. 31, 1994      
Total Residential Properties | Greenwood Forest | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Greenwood Forest | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Legacy Pines        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,157,000      
Initial Cost Buildings and Fixtures 19,066,000      
Gross Amount, Land 2,142,000      
Gross Amount, Buildings and Fixtures 22,771,000      
Total 24,913,000      
Accumulated Depreciation (10,576,000)      
Net $ 14,337,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Legacy Pines | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Legacy Pines | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Reserve at Woodwind Lakes | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Reserve at Woodwind Lakes | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Park Place (Houston)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost Land $ 2,061,000      
Initial Cost Buildings and Fixtures 15,830,000      
Gross Amount, Land 2,061,000      
Gross Amount, Buildings and Fixtures 19,129,000      
Total 21,190,000      
Accumulated Depreciation (6,454,000)      
Net $ 14,736,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Park Place (Houston) | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Park Place (Houston) | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Ranchstone        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,480,000      
Initial Cost Buildings and Fixtures 14,807,000      
Gross Amount, Land 1,480,000      
Gross Amount, Buildings and Fixtures 17,175,000      
Total 18,655,000      
Accumulated Depreciation (5,521,000)      
Net $ 13,134,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Ranchstone | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Ranchstone | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Retreat at Vintage Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 8,211,000      
Initial Cost Buildings and Fixtures 40,352,000      
Gross Amount, Land 8,211,000      
Gross Amount, Buildings and Fixtures 40,744,000      
Total 48,955,000      
Accumulated Depreciation (1,124,000)      
Net $ 47,831,000      
Date of Construction Dec. 31, 2014      
Total Residential Properties | Retreat at Vintage Park [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Retreat at Vintage Park [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Cascade at Fall Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,230,000      
Initial Cost Buildings and Fixtures 19,926,000      
Gross Amount, Land 3,230,000      
Gross Amount, Buildings and Fixtures 21,154,000      
Total 24,384,000      
Accumulated Depreciation (6,034,000)      
Net $ 18,350,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Cascade at Fall Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Cascade at Fall Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Chalet at Fall Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,755,000      
Initial Cost Buildings and Fixtures 20,085,000      
Gross Amount, Land 2,755,000      
Gross Amount, Buildings and Fixtures 20,945,000      
Total 23,700,000      
Accumulated Depreciation (6,337,000)      
Net $ 17,363,000      
Date of Construction Dec. 31, 2006      
Total Residential Properties | Chalet at Fall Creek | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Chalet at Fall Creek | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Bella Casita at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,521,000      
Initial Cost Buildings and Fixtures 26,432,000      
Gross Amount, Land 2,521,000      
Gross Amount, Buildings and Fixtures 27,824,000      
Total 30,345,000      
Accumulated Depreciation (4,912,000)      
Net $ 25,433,000      
Date of Construction Dec. 31, 2007      
Total Residential Properties | Bella Casita at Las Colinas | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Bella Casita at Las Colinas | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Remington Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,390,000      
Initial Cost Buildings and Fixtures 21,822,000      
Gross Amount, Land 4,390,000      
Gross Amount, Buildings and Fixtures 26,626,000      
Total 31,016,000      
Accumulated Depreciation (2,609,000)      
Net $ 28,407,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Remington Hills | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Remington Hills | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Reserve at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,902,000      
Initial Cost Buildings and Fixtures 40,691,000      
Gross Amount, Land 3,902,000      
Gross Amount, Buildings and Fixtures 41,689,000      
Total 45,591,000      
Accumulated Depreciation (3,645,000)      
Net $ 41,946,000      
Date of Construction Dec. 31, 2006      
Total Residential Properties | Colonial Reserve at Las Colinas | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Reserve at Las Colinas | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Valley Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 25,044,000      
Initial Cost Land 5,072,000      
Initial Cost Buildings and Fixtures 37,397,000      
Gross Amount, Land 5,072,000      
Gross Amount, Buildings and Fixtures 43,367,000      
Total 48,439,000      
Accumulated Depreciation (4,188,000)      
Net $ 44,251,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Valley Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Valley Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Lane at Towne Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,311,000      
Initial Cost Buildings and Fixtures 11,867,000      
Gross Amount, Land 1,303,000      
Gross Amount, Buildings and Fixtures 15,348,000      
Total 16,651,000      
Accumulated Depreciation (6,885,000)      
Net $ 9,766,000      
Date of Construction Dec. 31, 1983      
Total Residential Properties | Lane at Towne Crossing | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Lane at Towne Crossing | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Oakbend        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] $ 21,667,000      
Initial Cost Land 5,598,000      
Initial Cost Buildings and Fixtures 28,616,000      
Gross Amount, Land 5,598,000      
Gross Amount, Buildings and Fixtures 30,862,000      
Total 36,460,000      
Accumulated Depreciation (3,113,000)      
Net $ 33,347,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Village at Oakbend | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Oakbend | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Times Square at Craig Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,130,000      
Initial Cost Buildings and Fixtures 28,058,000      
Gross Amount, Land 1,130,000      
Gross Amount, Buildings and Fixtures 31,050,000      
Total 32,180,000      
Accumulated Depreciation (6,079,000)      
Net $ 26,101,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Times Square at Craig Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Times Square at Craig Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Venue at Stonebridge Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 14,767,000      
Initial Cost Land 4,034,000      
Initial Cost Buildings and Fixtures 19,528,000      
Gross Amount, Land 4,034,000      
Gross Amount, Buildings and Fixtures 19,775,000      
Total 23,809,000      
Accumulated Depreciation (1,342,000)      
Net $ 22,467,000      
Date of Construction Dec. 31, 2000      
Total Residential Properties | Venue at Stonebridge Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Venue at Stonebridge Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Highwood        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 864,000      
Initial Cost Buildings and Fixtures 7,783,000      
Gross Amount, Land 864,000      
Gross Amount, Buildings and Fixtures 11,698,000      
Total 12,562,000      
Accumulated Depreciation (7,422,000)      
Net $ 5,140,000      
Date of Construction Dec. 31, 1983      
Total Residential Properties | Highwood | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Highwood | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Cityscape at Market Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 8,626,000      
Initial Cost Buildings and Fixtures 60,407,000      
Gross Amount, Land 8,626,000      
Gross Amount, Buildings and Fixtures 60,945,000      
Total 69,571,000      
Accumulated Depreciation (2,481,000)      
Net $ 67,090,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Cityscape at Market Center [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Cityscape at Market Center [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Los Rios Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Total Residential Properties | Los Rios Park [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Los Rios Park [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Boulder Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,382,000      
Initial Cost Buildings and Fixtures 26,930,000      
Gross Amount, Land 3,382,000      
Gross Amount, Buildings and Fixtures 32,765,000      
Total 36,147,000      
Accumulated Depreciation (12,218,000)      
Net $ 23,929,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Boulder Ridge | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Boulder Ridge | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Copper Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,166,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 4,166,000      
Gross Amount, Buildings and Fixtures 21,358,000      
Total 25,524,000      
Accumulated Depreciation (3,950,000)      
Net $ 21,574,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Copper Ridge | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Copper Ridge | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Ashton Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,511,000      
Initial Cost Buildings and Fixtures 36,241,000      
Gross Amount, Land 5,511,000      
Gross Amount, Buildings and Fixtures 37,140,000      
Total 42,651,000      
Accumulated Depreciation (3,655,000)      
Net $ 38,996,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Colonial Grand at Ashton Oaks | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Ashton Oaks | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Round Rock        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 24,484,000      
Initial Cost Land 4,691,000      
Initial Cost Buildings and Fixtures 45,379,000      
Gross Amount, Land 4,691,000      
Gross Amount, Buildings and Fixtures 46,628,000      
Total 51,319,000      
Accumulated Depreciation (4,425,000)      
Net $ 46,894,000      
Date of Construction Dec. 31, 1997      
Total Residential Properties | Colonial Grand at Round Rock | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Round Rock | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Sierra Vista        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 10,900,000      
Initial Cost Land 2,561,000      
Initial Cost Buildings and Fixtures 16,488,000      
Gross Amount, Land 2,561,000      
Gross Amount, Buildings and Fixtures 18,330,000      
Total 20,891,000      
Accumulated Depreciation (1,836,000)      
Net $ 19,055,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Colonial Village at Sierra Vista | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Sierra Vista | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Alamo Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,380,000      
Initial Cost Buildings and Fixtures 26,982,000      
Gross Amount, Land 2,380,000      
Gross Amount, Buildings and Fixtures 28,786,000      
Total 31,166,000      
Accumulated Depreciation (5,067,000)      
Net $ 26,099,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Alamo Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Alamo Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Haven at Blanco        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,450,000      
Initial Cost Buildings and Fixtures 45,958,000      
Gross Amount, Land 5,450,000      
Gross Amount, Buildings and Fixtures 47,797,000      
Total 53,247,000      
Accumulated Depreciation (5,586,000)      
Net $ 47,661,000      
Date of Construction Dec. 31, 2010      
Total Residential Properties | Haven at Blanco | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Haven at Blanco | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Stone Ranch at Westover Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 18,499,000      
Initial Cost Land 4,000,000      
Initial Cost Buildings and Fixtures 24,992,000      
Gross Amount, Land 4,000,000      
Gross Amount, Buildings and Fixtures 26,974,000      
Total 30,974,000      
Accumulated Depreciation (5,693,000)      
Net $ 25,281,000      
Date of Construction Dec. 31, 2009      
Total Residential Properties | Stone Ranch at Westover Hills | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Stone Ranch at Westover Hills | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Bulverde Oaks [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] $ 0      
Initial Cost Land 4,257,000      
Initial Cost Buildings and Fixtures 36,759,000      
Gross Amount, Land 4,257,000      
Gross Amount, Buildings and Fixtures 37,238,000      
Total 41,495,000      
Accumulated Depreciation (1,119,000)      
Net $ 40,376,000      
Date of Construction Dec. 31, 2014      
Total Residential Properties | Bulverde Oaks [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Bulverde Oaks [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Cypresswood Court        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 576,000      
Initial Cost Buildings and Fixtures 5,190,000      
Gross Amount, Land 576,000      
Gross Amount, Buildings and Fixtures 8,999,000      
Total 9,575,000      
Accumulated Depreciation (6,289,000)      
Net $ 3,286,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Cypresswood Court | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Cypresswood Court | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Villages At Kirkwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,918,000      
Initial Cost Buildings and Fixtures 15,846,000      
Gross Amount, Land 1,918,000      
Gross Amount, Buildings and Fixtures 18,649,000      
Total 20,567,000      
Accumulated Depreciation (7,615,000)      
Net $ 12,952,000      
Date of Construction Dec. 31, 1996      
Total Residential Properties | Villages At Kirkwood [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Villages At Kirkwood [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Green Tree Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 539,000      
Initial Cost Buildings and Fixtures 4,850,000      
Gross Amount, Land 539,000      
Gross Amount, Buildings and Fixtures 8,456,000      
Total 8,995,000      
Accumulated Depreciation (5,777,000)      
Net $ 3,218,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Green Tree Place | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Green Tree Place | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Retreat at West Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 7,112,000      
Initial Cost Buildings and Fixtures 36,136,000      
Gross Amount, Land 7,112,000      
Gross Amount, Buildings and Fixtures 36,382,000      
Total 43,494,000      
Accumulated Depreciation (542,000)      
Net $ 42,952,000      
Date of Construction Dec. 31, 2015      
Total Residential Properties | Retreat at West Creek [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Retreat at West Creek [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Adalay Bay        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,280,000      
Initial Cost Buildings and Fixtures 31,341,000      
Gross Amount, Land 5,280,000      
Gross Amount, Buildings and Fixtures 33,114,000      
Total 38,394,000      
Accumulated Depreciation (4,385,000)      
Net $ 34,009,000      
Date of Construction Dec. 31, 2002      
Total Residential Properties | Adalay Bay | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Adalay Bay | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Greenbrier        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,842,000      
Initial Cost Buildings and Fixtures 21,677,000      
Gross Amount, Land 4,842,000      
Gross Amount, Buildings and Fixtures 22,422,000      
Total 27,264,000      
Accumulated Depreciation (2,065,000)      
Net $ 25,199,000      
Date of Construction Dec. 31, 1980      
Total Residential Properties | Colonial Village at Greenbrier | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Greenbrier | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Radius [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,040,000      
Initial Cost Buildings and Fixtures 36,481,000      
Gross Amount, Land 5,040,000      
Gross Amount, Buildings and Fixtures 36,579,000      
Total 41,619,000      
Accumulated Depreciation (389,000)      
Net $ 41,230,000      
Date of Construction Dec. 31, 2012      
Total Residential Properties | Radius [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Radius [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Seasons at Celebrate Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,960,000      
Initial Cost Buildings and Fixtures 32,083,000      
Gross Amount, Land 14,490,000      
Gross Amount, Buildings and Fixtures 70,551,000      
Total 85,041,000      
Accumulated Depreciation (6,686,000)      
Net $ 78,355,000      
Date of Construction Dec. 31, 2011      
Total Residential Properties | Seasons at Celebrate Virginia | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Seasons at Celebrate Virginia | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Stonefield Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 11,044,000      
Initial Cost Buildings and Fixtures 36,689,000      
Gross Amount, Land 11,044,000      
Gross Amount, Buildings and Fixtures 36,982,000      
Total 48,026,000      
Accumulated Depreciation (1,507,000)      
Net $ 46,519,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Stonefield Commons [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Stonefield Commons [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Station Square at Cosner's Corner        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 8,580,000      
Initial Cost Buildings and Fixtures 35,700,000      
Gross Amount, Land 8,580,000      
Gross Amount, Buildings and Fixtures 36,054,000      
Total 44,634,000      
Accumulated Depreciation (2,412,000)      
Net $ 42,222,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Station Square at Cosner's Corner | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Station Square at Cosner's Corner | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Hampton Glen        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,851,000      
Initial Cost Buildings and Fixtures 21,678,000      
Gross Amount, Land 4,851,000      
Gross Amount, Buildings and Fixtures 22,737,000      
Total 27,588,000      
Accumulated Depreciation (2,229,000)      
Net $ 25,359,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Colonial Village at Hampton Glen | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Hampton Glen | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at West End        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 12,611,000      
Initial Cost Land 4,661,000      
Initial Cost Buildings and Fixtures 18,908,000      
Gross Amount, Land 4,661,000      
Gross Amount, Buildings and Fixtures 20,166,000      
Total 24,827,000      
Accumulated Depreciation (1,882,000)      
Net $ 22,945,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Colonial Village at West End | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at West End | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Township        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,509,000      
Initial Cost Buildings and Fixtures 8,189,000      
Gross Amount, Land 1,509,000      
Gross Amount, Buildings and Fixtures 17,593,000      
Total 19,102,000      
Accumulated Depreciation (10,817,000)      
Net $ 8,285,000      
Date of Construction Dec. 31, 1987      
Total Residential Properties | Township | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Township | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Tradewinds        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,631,000      
Initial Cost Buildings and Fixtures 15,660,000      
Gross Amount, Land 5,631,000      
Gross Amount, Buildings and Fixtures 17,008,000      
Total 22,639,000      
Accumulated Depreciation (1,697,000)      
Net $ 20,942,000      
Date of Construction Dec. 31, 1988      
Total Residential Properties | Colonial Village at Tradewinds | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Tradewinds | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Waterford        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,733,000      
Initial Cost Buildings and Fixtures 29,221,000      
Gross Amount, Land 6,733,000      
Gross Amount, Buildings and Fixtures 31,040,000      
Total 37,773,000      
Accumulated Depreciation (3,153,000)      
Net $ 34,620,000      
Date of Construction Dec. 31, 1989      
Total Residential Properties | Colonial Village at Waterford | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Waterford | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Ashley Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,761,000      
Initial Cost Buildings and Fixtures 13,365,000      
Gross Amount, Land 4,761,000      
Gross Amount, Buildings and Fixtures 14,369,000      
Total 19,130,000      
Accumulated Depreciation (1,618,000)      
Net $ 17,512,000      
Date of Construction Dec. 31, 1988      
Total Residential Properties | Ashley Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Ashley Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Chase Gayton        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 6,021,000      
Initial Cost Buildings and Fixtures 29,004,000      
Gross Amount, Land 6,021,000      
Gross Amount, Buildings and Fixtures 30,812,000      
Total 36,833,000      
Accumulated Depreciation (3,108,000)      
Net $ 33,725,000      
Date of Construction Dec. 31, 1984      
Total Residential Properties | Colonial Village at Chase Gayton | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Chase Gayton | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Hamptons at Hunton Park        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,930,000      
Initial Cost Buildings and Fixtures 35,598,000      
Gross Amount, Land 4,930,000      
Gross Amount, Buildings and Fixtures 38,159,000      
Total 43,089,000      
Accumulated Depreciation (6,237,000)      
Net $ 36,852,000      
Date of Construction Dec. 31, 2003      
Total Residential Properties | Hamptons at Hunton Park | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Hamptons at Hunton Park | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Harbour Club        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] $ 0      
Initial Cost Land 3,483,000      
Initial Cost Buildings and Fixtures 14,796,000      
Gross Amount, Land 3,483,000      
Gross Amount, Buildings and Fixtures 15,639,000      
Total 19,122,000      
Accumulated Depreciation (1,503,000)      
Net $ 17,619,000      
Date of Construction Dec. 31, 1988      
Total Residential Properties | Colonial Village at Harbour Club | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Harbour Club | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Lake Mary Phase III        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,306,000      
Initial Cost Buildings and Fixtures 7,996,000      
Gross Amount, Land 1,306,000      
Gross Amount, Buildings and Fixtures 18,687,000      
Total 19,993,000      
Accumulated Depreciation (703,000)      
Net $ 19,290,000      
Date of Construction Dec. 31, 2014      
Total Residential Properties | Colonial Grand at Lake Mary Phase III | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Lake Mary Phase III | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Randal Lakes        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,659,000      
Initial Cost Buildings and Fixtures 50,553,000      
Gross Amount, Land 5,659,000      
Gross Amount, Buildings and Fixtures 60,949,000      
Total 66,608,000      
Accumulated Depreciation (2,926,000)      
Net $ 63,682,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Colonial Grand at Randal Lakes | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Randal Lakes | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Chancellor Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] $ 0      
Initial Cost Land 5,311,000      
Initial Cost Buildings and Fixtures 28,016,000      
Gross Amount, Land 5,311,000      
Gross Amount, Buildings and Fixtures 29,697,000      
Total 35,008,000      
Accumulated Depreciation (2,753,000)      
Net $ 32,255,000      
Date of Construction Dec. 31, 1999      
Total Residential Properties | Colonial Village at Chancellor Park [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Chancellor Park [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Bellevue (Phase II)        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 8,656,000      
Initial Cost Buildings and Fixtures 4,549,000      
Gross Amount, Land 8,656,000      
Gross Amount, Buildings and Fixtures 30,128,000      
Total 38,784,000      
Accumulated Depreciation (543,000)      
Net $ 38,241,000      
Date of Construction Dec. 31, 2015      
Total Residential Properties | Colonial Grand at Bellevue (Phase II) | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Bellevue (Phase II) | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | 220 Riverside        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,500,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 2,500,000      
Gross Amount, Buildings and Fixtures 40,145,000      
Total 42,645,000      
Accumulated Depreciation (342,000)      
Net $ 42,303,000      
Date of Construction Dec. 31, 2015      
Total Residential Properties | 220 Riverside | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | 220 Riverside | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Mallard Lake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,642,000      
Initial Cost Land 3,250,000      
Initial Cost Buildings and Fixtures 31,389,000      
Gross Amount, Land 3,250,000      
Gross Amount, Buildings and Fixtures 32,907,000      
Total 36,157,000      
Accumulated Depreciation (3,284,000)      
Net $ 32,873,000      
Date of Construction Dec. 31, 1998      
Total Residential Properties | Colonial Grand at Mallard Lake [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Mallard Lake [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at University Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 1,620,000      
Initial Cost Buildings and Fixtures 17,499,000      
Gross Amount, Land 1,620,000      
Gross Amount, Buildings and Fixtures 17,888,000      
Total 19,508,000      
Accumulated Depreciation (1,663,000)      
Net $ 17,845,000      
Date of Construction Dec. 31, 2005      
Total Residential Properties | Colonial Grand at University Center [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at University Center [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Reserve at South End (Charlotte, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 4,628,000      
Initial Cost Buildings and Fixtures 44,282,000      
Gross Amount, Land 4,628,000      
Gross Amount, Buildings and Fixtures 55,108,000      
Total 59,736,000      
Accumulated Depreciation (2,474,000)      
Net $ 57,262,000      
Date of Construction Dec. 31, 2013      
Total Residential Properties | Colonial Reserve at South End (Charlotte, NC) [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Reserve at South End (Charlotte, NC) [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Grand at Cypress Cove [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,610,000      
Initial Cost Buildings and Fixtures 28,645,000      
Gross Amount, Land 3,610,000      
Gross Amount, Buildings and Fixtures 29,737,000      
Total 33,347,000      
Accumulated Depreciation (2,947,000)      
Net $ 30,400,000      
Date of Construction Dec. 31, 2001      
Total Residential Properties | Colonial Grand at Cypress Cove [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Grand at Cypress Cove [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Colonial Village at Hampton Pointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 3,971,000      
Initial Cost Buildings and Fixtures 22,790,000      
Gross Amount, Land 3,971,000      
Gross Amount, Buildings and Fixtures 24,913,000      
Total 28,884,000      
Accumulated Depreciation (2,432,000)      
Net $ 26,452,000      
Date of Construction Dec. 31, 1986      
Total Residential Properties | Colonial Village at Hampton Pointe [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Total Residential Properties | Colonial Village at Hampton Pointe [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Total Residential Properties | Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition $ 20,116,000      
Total Residential Properties | Land | Colonial Grand at Quarterdeck [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Westchase [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | River's Walk [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Fairways [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Columbia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Tanglewood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Corners [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Birchall at Ross Bridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Riverchase Trails        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Trussville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Eagle Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Traditions        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Abbington Place        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Edgewater        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Huntsville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 830,000      
Total Residential Properties | Land | Colonial Grand at Madison        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Montgomery        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Cypress Village at Cypress Village        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Liberty Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at OldTown Scottsdale [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Calais Forest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | SkySong [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Napa Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Palisades At Chenal Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Ridge at Chenal Valley        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Westside Creek I & II        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Edge at Lyon's Gate        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Sky View Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Talus Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Inverness Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Scottsdale        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Tiffany Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Indigo Point        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Brandon        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Lakewood Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Preserve at Coral Square        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Gainesville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | The Retreat at Magnolia Parke        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Heathrow        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Atlantic Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Cooper's Hawk        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Hunter's Ridge at Deerwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lakeside        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lighthouse at Fleming Island        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Mandarin        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | St Augustine        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | St Augustine II        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Tattersall at Tapestry Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Woodhollow        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (8,000)      
Total Residential Properties | Land | Paddock Club Lakeland        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (1,033,000)      
Total Residential Properties | Land | Colonial Grand at Lake Mary        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,260,000      
Total Residential Properties | Land | Colonial Grand at Town Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Town Park Reserve        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Retreat at Lake Nona        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Heather Glen        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | The Club at Panama Beach        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (5,000)      
Total Residential Properties | Land | Colonial Village at Twin Lakes        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Tallahassee        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 950,000      
Total Residential Properties | Land | Verandas at Southwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Belmere        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Links at Carrollwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 110,000      
Total Residential Properties | Land | Village Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 153,000      
Total Residential Properties | Land | Colonial Grand at Hampton Preserve        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Seven Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Windermere        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Park Crest At Innisbrook        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Allure at Brookwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Allure in Buckhead Village Residential        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Sanctuary At Oglethorpe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Terraces at Fieldstone        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Prescott        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Berkeley Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lake Lanier Club I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at River Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lake Lanier Club II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at River Plantation        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at McDaniel Farm        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Pleasant Hill        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Mount Vernon        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Shiloh        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Milstead Village        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Barrett Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Godley Station        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Godley Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Avala at Savannah Quarters        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Georgetown Grove        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Hammocks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Haven at Prairie Trace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Greentree        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Grand Reserve at Pinnacle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Huntington        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Marsh Cove        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Oaks at Wilmington Island        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Highlands of West Village I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Highlands of West Village II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Terraces At Townelake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,688,000      
Total Residential Properties | Land | Residences at Burlington Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lakepointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Mansion [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Stonemill Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Crosswinds [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Pear Orchard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Reflection Pointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 138,000      
Total Residential Properties | Land | Lakeshore Landing [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Market Station [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Desert Vista [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Palm Vista [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Beaver Creek (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Hermitage at Beechtree        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Waterford Forest        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | 1225 South Church I        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,832,000      
Total Residential Properties | Land | Colonial Grand at Ayrsley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,241,000      
Total Residential Properties | Land | Colonial Grand at Beverly Crest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Legacy Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Mallard Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at South Tryon        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Stone Point        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Timber Crest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Enclave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Cornelius [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Patterson Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Woodlake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Deerfield [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Research Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Greystone [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Autumn Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Huntersville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Matthews [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Matthews Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Arringdon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Brier Creek (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Brier Falls (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Crabtree Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Hue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Trinity Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Preserve At Brier Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (19,000)      
Total Residential Properties | Land | Providence At Brier Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Park Haywood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 35,000      
Total Residential Properties | Land | Spring Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (14,000)      
Total Residential Properties | Land | Glen Eagles [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Mill Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Paddock Club Greenville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Howell Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Highland Ridge [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Windsor Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Woodwinds [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Runaway Bay        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 12,000      
Total Residential Properties | Land | Colonial Grand at Commerce Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | 535 Brookwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Park Place        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Farmington Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Waters Edge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Hamilton Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Hidden Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Steeplechase        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Windridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Kirby Station        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lincoln on the Green        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Park Estate        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Reserve at Dexter Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,147,000      
Total Residential Properties | Land | Paddock Club Murfreesboro        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Aventura at Indian Lake Village        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Avondale at Kennesaw        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Brentwood Downs        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (2,000)      
Total Residential Properties | Land | Colonial Grand at Bellevue        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Grand View Nashville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Monthaven Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Park at Hermitage        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Venue at Cool Springs        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Verandas at Sam Ridley        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Northwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Balcones Woods        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Canyon Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Canyon Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Double Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Onion Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Grand Reserve at Sunset Valley        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Quarry Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Wells Branch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 294,000      
Total Residential Properties | Land | Legacy at Western Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Silverado        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Stassney Woods        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Travis Station        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Woods, The        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Shoal Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Hebron (Dallas, TX) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Silverado [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Silverado Reserve [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Grand Cypress [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Courtyards at Campbell        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Deer Run        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Grand Courtyard        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Legends at Lowe's Farm        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Reserve at Medical District        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Watermark        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Main Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Bear Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Fairview        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | La Valencia at Starwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Cityscape at Market Center II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Reserve at Frisco Bridges        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Grapevine        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Greenwood Forest        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Legacy Pines        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (15,000)      
Total Residential Properties | Land | Ranchstone        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Retreat at Vintage Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Cascade at Fall Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Chalet at Fall Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Bella Casita at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Remington Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Valley Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Lane at Towne Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (8,000)      
Total Residential Properties | Land | Colonial Village at Oakbend        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Times Square at Craig Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Venue at Stonebridge Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Highwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Cityscape at Market Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Los Rios Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Boulder Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Copper Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Ashton Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Round Rock        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Sierra Vista        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Alamo Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Haven at Blanco        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Stone Ranch at Westover Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Bulverde Oaks [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Cypresswood Court        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Green Tree Place        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Retreat at West Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Adalay Bay        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Greenbrier        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Radius [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Seasons at Celebrate Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 7,530,000      
Total Residential Properties | Land | Stonefield Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Station Square at Cosner's Corner        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Hampton Glen        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at West End        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Township        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Tradewinds        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Ashley Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Chase Gayton        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Hamptons at Hunton Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Harbour Club        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Lake Mary Phase III        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Randal Lakes        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Chancellor Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Bellevue (Phase II)        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | 220 Riverside        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Mallard Lake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at University Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Reserve at South End (Charlotte, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Grand at Cypress Cove [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Land | Colonial Village at Hampton Pointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,081,694,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Quarterdeck [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,887,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Westchase [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,476,000      
Total Residential Properties | Buildings and Fixtures | River's Walk [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 28,810,000      
Total Residential Properties | Buildings and Fixtures | Fairways [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,831,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Columbia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,548,000      
Total Residential Properties | Buildings and Fixtures | Tanglewood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,486,000      
Total Residential Properties | Buildings and Fixtures | Corners [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,453,000      
Total Residential Properties | Buildings and Fixtures | Birchall at Ross Bridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 848,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Riverchase Trails        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,575,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Trussville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,295,000      
Total Residential Properties | Buildings and Fixtures | Eagle Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,376,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Traditions        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,228,000      
Total Residential Properties | Buildings and Fixtures | Abbington Place        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,047,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Edgewater        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,412,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Huntsville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 14,197,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Madison        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 718,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Montgomery        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,050,000      
Total Residential Properties | Buildings and Fixtures | Cypress Village at Cypress Village        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 468,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Liberty Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,291,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at OldTown Scottsdale [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,664,000      
Total Residential Properties | Buildings and Fixtures | Calais Forest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 8,401,000      
Total Residential Properties | Buildings and Fixtures | SkySong [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 296,000      
Total Residential Properties | Buildings and Fixtures | Napa Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,247,000      
Total Residential Properties | Buildings and Fixtures | Palisades At Chenal Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,266,000      
Total Residential Properties | Buildings and Fixtures | Ridge at Chenal Valley        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 26,917,000      
Total Residential Properties | Buildings and Fixtures | Westside Creek I & II        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 8,286,000      
Total Residential Properties | Buildings and Fixtures | Edge at Lyon's Gate        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,632,000      
Total Residential Properties | Buildings and Fixtures | Sky View Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,461,000      
Total Residential Properties | Buildings and Fixtures | Talus Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,046,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Inverness Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 929,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Scottsdale        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,344,000      
Total Residential Properties | Buildings and Fixtures | Tiffany Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 6,163,000      
Total Residential Properties | Buildings and Fixtures | Indigo Point        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,754,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Brandon        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,688,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Lakewood Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,697,000      
Total Residential Properties | Buildings and Fixtures | Preserve at Coral Square        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 9,188,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Gainesville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,347,000      
Total Residential Properties | Buildings and Fixtures | The Retreat at Magnolia Parke        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 406,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Heathrow        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,427,000      
Total Residential Properties | Buildings and Fixtures | Atlantic Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,246,000      
Total Residential Properties | Buildings and Fixtures | Cooper's Hawk        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,950,000      
Total Residential Properties | Buildings and Fixtures | Hunter's Ridge at Deerwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 6,864,000      
Total Residential Properties | Buildings and Fixtures | Lakeside        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 9,977,000      
Total Residential Properties | Buildings and Fixtures | Lighthouse at Fleming Island        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,487,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Mandarin        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,961,000      
Total Residential Properties | Buildings and Fixtures | St Augustine        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 7,585,000      
Total Residential Properties | Buildings and Fixtures | St Augustine II        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 13,394,000      
Total Residential Properties | Buildings and Fixtures | Tattersall at Tapestry Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 611,000      
Total Residential Properties | Buildings and Fixtures | Woodhollow        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 10,222,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Lakeland        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 8,836,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Lake Mary        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 12,061,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Town Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,614,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Town Park Reserve        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 188,000      
Total Residential Properties | Buildings and Fixtures | Retreat at Lake Nona        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,096,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Heather Glen        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,403,000      
Total Residential Properties | Buildings and Fixtures | The Club at Panama Beach        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,100,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Twin Lakes        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 976,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Tallahassee        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 14,695,000      
Total Residential Properties | Buildings and Fixtures | Verandas at Southwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 115,000      
Total Residential Properties | Buildings and Fixtures | Belmere        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 6,282,000      
Total Residential Properties | Buildings and Fixtures | Village Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,997,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Hampton Preserve        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 750,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Seven Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 741,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Windermere        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 492,000      
Total Residential Properties | Buildings and Fixtures | Park Crest At Innisbrook        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 932,000      
Total Residential Properties | Buildings and Fixtures | Allure at Brookwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,960,000      
Total Residential Properties | Buildings and Fixtures | Allure in Buckhead Village Residential        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,923,000      
Total Residential Properties | Buildings and Fixtures | Sanctuary At Oglethorpe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,452,000      
Total Residential Properties | Buildings and Fixtures | Terraces at Fieldstone        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,877,000      
Total Residential Properties | Buildings and Fixtures | Prescott        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,008,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Berkeley Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 870,000      
Total Residential Properties | Buildings and Fixtures | Lake Lanier Club I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,386,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at River Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 961,000      
Total Residential Properties | Buildings and Fixtures | Lake Lanier Club II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,168,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at River Plantation        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,075,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at McDaniel Farm        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,816,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Pleasant Hill        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,960,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Mount Vernon        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,137,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Shiloh        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,683,000      
Total Residential Properties | Buildings and Fixtures | Milstead Village        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 192,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Barrett Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,246,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Godley Station        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,344,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Godley Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 683,000      
Total Residential Properties | Buildings and Fixtures | Avala at Savannah Quarters        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 818,000      
Total Residential Properties | Buildings and Fixtures | Georgetown Grove        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,130,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Hammocks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,630,000      
Total Residential Properties | Buildings and Fixtures | Haven at Prairie Trace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 250,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Greentree        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 611,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Huntington        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 300,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Marsh Cove        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 472,000      
Total Residential Properties | Buildings and Fixtures | Oaks at Wilmington Island        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,049,000      
Total Residential Properties | Buildings and Fixtures | Highlands of West Village I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,377,000      
Total Residential Properties | Buildings and Fixtures | Highlands of West Village II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 35,000      
Total Residential Properties | Buildings and Fixtures | Terraces At Townelake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 22,465,000      
Total Residential Properties | Buildings and Fixtures | Residences at Burlington Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 311,000      
Total Residential Properties | Buildings and Fixtures | Lakepointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,613,000      
Total Residential Properties | Buildings and Fixtures | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Residential Properties | Buildings and Fixtures | Mansion [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,725,000      
Total Residential Properties | Buildings and Fixtures | Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,050,000      
Total Residential Properties | Buildings and Fixtures | Stonemill Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 10,049,000      
Total Residential Properties | Buildings and Fixtures | Crosswinds [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,748,000      
Total Residential Properties | Buildings and Fixtures | Pear Orchard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 9,055,000      
Total Residential Properties | Buildings and Fixtures | Reflection Pointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 8,737,000      
Total Residential Properties | Buildings and Fixtures | Lakeshore Landing [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,961,000      
Total Residential Properties | Buildings and Fixtures | Market Station [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 752,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Desert Vista [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 633,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Palm Vista [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,136,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Beaver Creek (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 963,000      
Total Residential Properties | Buildings and Fixtures | Hermitage at Beechtree        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,352,000      
Total Residential Properties | Buildings and Fixtures | Waterford Forest        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,235,000      
Total Residential Properties | Buildings and Fixtures | 1225 South Church I        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 23,562,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Ayrsley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 12,432,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Beverly Crest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [1] 15,496,000      
Initial Cost Land 3,161,000      
Initial Cost Buildings and Fixtures 24,004,000      
Cost Capitalized subsequent to Acquisition 1,774,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Legacy Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,007,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Mallard Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 588,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at South Tryon        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 726,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Stone Point        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 804,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Timber Crest [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 769,000      
Total Residential Properties | Buildings and Fixtures | Enclave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 353,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Cornelius [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 510,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Patterson Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,174,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Woodlake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 721,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Deerfield [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 678,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Research Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 908,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Greystone [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,210,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Autumn Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 967,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Huntersville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 862,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Matthews [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,508,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Matthews Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,012,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Arringdon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 931,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Brier Creek (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 867,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Brier Falls (Raleigh, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 747,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Crabtree Valley [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 925,000      
Total Residential Properties | Buildings and Fixtures | Hue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,550,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Trinity Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,477,000      
Total Residential Properties | Buildings and Fixtures | Preserve At Brier Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 24,178,000      
Total Residential Properties | Buildings and Fixtures | Providence At Brier Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,424,000      
Total Residential Properties | Buildings and Fixtures | Park Haywood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,012,000      
Total Residential Properties | Buildings and Fixtures | Spring Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,577,000      
Total Residential Properties | Buildings and Fixtures | Glen Eagles [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,276,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Mill Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 546,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Greenville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,369,000      
Total Residential Properties | Buildings and Fixtures | Howell Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,439,000      
Total Residential Properties | Buildings and Fixtures | Highland Ridge [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,678,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Windsor Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,277,000      
Total Residential Properties | Buildings and Fixtures | Woodwinds [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,246,000      
Total Residential Properties | Buildings and Fixtures | Runaway Bay        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 6,889,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Commerce Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 753,000      
Total Residential Properties | Buildings and Fixtures | 535 Brookwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 851,000      
Total Residential Properties | Buildings and Fixtures | Park Place        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,374,000      
Total Residential Properties | Buildings and Fixtures | Farmington Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,197,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Waters Edge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,979,000      
Total Residential Properties | Buildings and Fixtures | Hamilton Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,326,000      
Total Residential Properties | Buildings and Fixtures | Hidden Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,877,000      
Total Residential Properties | Buildings and Fixtures | Steeplechase        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,350,000      
Total Residential Properties | Buildings and Fixtures | Windridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,462,000      
Total Residential Properties | Buildings and Fixtures | Kirby Station        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 10,385,000      
Total Residential Properties | Buildings and Fixtures | Lincoln on the Green        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 15,864,000      
Total Residential Properties | Buildings and Fixtures | Park Estate        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,047,000      
Total Residential Properties | Buildings and Fixtures | Reserve at Dexter Lake        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 39,413,000      
Total Residential Properties | Buildings and Fixtures | Paddock Club Murfreesboro        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,143,000      
Total Residential Properties | Buildings and Fixtures | Aventura at Indian Lake Village        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,035,000      
Total Residential Properties | Buildings and Fixtures | Avondale at Kennesaw        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,419,000      
Total Residential Properties | Buildings and Fixtures | Brentwood Downs        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 7,368,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Bellevue        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,204,000      
Total Residential Properties | Buildings and Fixtures | Grand View Nashville        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 6,820,000      
Total Residential Properties | Buildings and Fixtures | Monthaven Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,467,000      
Total Residential Properties | Buildings and Fixtures | Park at Hermitage        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 9,574,000      
Total Residential Properties | Buildings and Fixtures | Venue at Cool Springs        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 50,396,000      
Total Residential Properties | Buildings and Fixtures | Verandas at Sam Ridley        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,346,000      
Total Residential Properties | Buildings and Fixtures | Northwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,869,000      
Total Residential Properties | Buildings and Fixtures | Balcones Woods        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 11,475,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Canyon Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,095,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Canyon Pointe        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,150,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Double Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 292,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Onion Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 799,000      
Total Residential Properties | Buildings and Fixtures | Grand Reserve at Sunset Valley        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,488,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Quarry Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,763,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Wells Branch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 871,000      
Total Residential Properties | Buildings and Fixtures | Legacy at Western Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (2,348,000)      
Total Residential Properties | Buildings and Fixtures | Silverado        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,770,000      
Total Residential Properties | Buildings and Fixtures | Stassney Woods        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 8,615,000      
Total Residential Properties | Buildings and Fixtures | Travis Station        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 7,526,000      
Total Residential Properties | Buildings and Fixtures | Woods, The        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 7,855,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Shoal Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,614,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Willow Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,700,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Hebron (Dallas, TX) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 505,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Silverado [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 737,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Silverado Reserve [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,005,000      
Total Residential Properties | Buildings and Fixtures | Grand Cypress [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 677,000      
Total Residential Properties | Buildings and Fixtures | Courtyards at Campbell        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,013,000      
Total Residential Properties | Buildings and Fixtures | Deer Run        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,160,000      
Total Residential Properties | Buildings and Fixtures | Grand Courtyard        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,620,000      
Total Residential Properties | Buildings and Fixtures | Legends at Lowe's Farm        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,341,000      
Total Residential Properties | Buildings and Fixtures | Colonial Reserve at Medical District        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 888,000      
Total Residential Properties | Buildings and Fixtures | Watermark        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,119,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Main Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,204,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Bear Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,876,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Fairview        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 421,000      
Total Residential Properties | Buildings and Fixtures | La Valencia at Starwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,014,000      
Total Residential Properties | Buildings and Fixtures | Cityscape at Market Center II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 20,000      
Total Residential Properties | Buildings and Fixtures | Colonial Reserve at Frisco Bridges        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 831,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Grapevine        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,958,000      
Total Residential Properties | Buildings and Fixtures | Greenwood Forest        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition (159,000)      
Total Residential Properties | Buildings and Fixtures | Legacy Pines        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,705,000      
Total Residential Properties | Buildings and Fixtures | Park Place (Houston)        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,299,000      
Total Residential Properties | Buildings and Fixtures | Ranchstone        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,368,000      
Total Residential Properties | Buildings and Fixtures | Retreat at Vintage Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 392,000      
Total Residential Properties | Buildings and Fixtures | Cascade at Fall Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,228,000      
Total Residential Properties | Buildings and Fixtures | Chalet at Fall Creek        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 860,000      
Total Residential Properties | Buildings and Fixtures | Bella Casita at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,392,000      
Total Residential Properties | Buildings and Fixtures | Remington Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 4,804,000      
Total Residential Properties | Buildings and Fixtures | Colonial Reserve at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 998,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Valley Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,970,000      
Total Residential Properties | Buildings and Fixtures | Lane at Towne Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,481,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Oakbend        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,246,000      
Total Residential Properties | Buildings and Fixtures | Times Square at Craig Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,992,000      
Total Residential Properties | Buildings and Fixtures | Venue at Stonebridge Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 247,000      
Total Residential Properties | Buildings and Fixtures | Highwood        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,915,000      
Total Residential Properties | Buildings and Fixtures | Cityscape at Market Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 538,000      
Total Residential Properties | Buildings and Fixtures | Los Rios Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,005,000      
Total Residential Properties | Buildings and Fixtures | Boulder Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 5,835,000      
Total Residential Properties | Buildings and Fixtures | Copper Ridge        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 21,358,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Ashton Oaks        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 899,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Round Rock        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,249,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Sierra Vista        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,842,000      
Total Residential Properties | Buildings and Fixtures | Alamo Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,804,000      
Total Residential Properties | Buildings and Fixtures | Haven at Blanco        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,839,000      
Total Residential Properties | Buildings and Fixtures | Stone Ranch at Westover Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,982,000      
Total Residential Properties | Buildings and Fixtures | Bulverde Oaks [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 479,000      
Total Residential Properties | Buildings and Fixtures | Cypresswood Court        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,809,000      
Total Residential Properties | Buildings and Fixtures | Villages At Kirkwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,803,000      
Total Residential Properties | Buildings and Fixtures | Green Tree Place        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 3,606,000      
Total Residential Properties | Buildings and Fixtures | Retreat at West Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 246,000      
Total Residential Properties | Buildings and Fixtures | Adalay Bay        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,773,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Greenbrier        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 745,000      
Total Residential Properties | Buildings and Fixtures | Radius [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 98,000      
Total Residential Properties | Buildings and Fixtures | Seasons at Celebrate Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 38,468,000      
Total Residential Properties | Buildings and Fixtures | Stonefield Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 293,000      
Total Residential Properties | Buildings and Fixtures | Station Square at Cosner's Corner        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 354,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Hampton Glen        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,059,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at West End        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,258,000      
Total Residential Properties | Buildings and Fixtures | Township        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 9,404,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Tradewinds        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,348,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Waterford        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,819,000      
Total Residential Properties | Buildings and Fixtures | Ashley Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,004,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Chase Gayton        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,808,000      
Total Residential Properties | Buildings and Fixtures | Hamptons at Hunton Park        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,561,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Harbour Club        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 843,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Lake Mary Phase III        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 10,691,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Randal Lakes        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 10,396,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Chancellor Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,681,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Bellevue (Phase II)        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 25,579,000      
Total Residential Properties | Buildings and Fixtures | 220 Riverside        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 40,145,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Mallard Lake [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,518,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at University Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 389,000      
Total Residential Properties | Buildings and Fixtures | Colonial Reserve at South End (Charlotte, NC) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 10,826,000      
Total Residential Properties | Buildings and Fixtures | Colonial Grand at Cypress Cove [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,092,000      
Total Residential Properties | Buildings and Fixtures | Colonial Village at Hampton Pointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,123,000      
Total Residential Properties | Villages At Kirkwood [Member] | Lane at Towne Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Los Rios Park [Member] | Los Rios Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost Land 3,273,000      
Initial Cost Buildings and Fixtures 28,823,000      
Gross Amount, Land 3,273,000      
Gross Amount, Buildings and Fixtures 33,828,000      
Total 37,101,000      
Accumulated Depreciation (14,858,000)      
Net $ 22,243,000      
Date of Construction Dec. 31, 2000      
Grand Reserve at Pinnacle [Member] | Buildings and Fixtures | Colonial Village at Greentree        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition $ 4,264,000      
Retail Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost Land 10,219,000      
Initial Cost Buildings and Fixtures 37,183,000      
Gross Amount, Land 10,228,000      
Gross Amount, Buildings and Fixtures 39,625,000      
Total 49,853,000      
Accumulated Depreciation (2,699,000)      
Net 47,154,000      
Retail Properties | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 700,000      
Initial Cost Buildings and Fixtures 4,439,000      
Gross Amount, Land 700,000      
Gross Amount, Buildings and Fixtures 4,439,000      
Total 5,139,000      
Accumulated Depreciation 0      
Net $ 5,139,000      
Date of Construction Dec. 31, 2014      
Retail Properties | The Denton [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | The Denton [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | Bella Casita at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 46,000      
Initial Cost Buildings and Fixtures 186,000      
Gross Amount, Land 46,000      
Gross Amount, Buildings and Fixtures 312,000      
Total 358,000      
Accumulated Depreciation (54,000)      
Net $ 304,000      
Date of Construction Dec. 31, 2007      
Retail Properties | Bella Casita at Las Colinas | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | Bella Casita at Las Colinas | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | Times Square at Craig Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 253,000      
Initial Cost Buildings and Fixtures 1,310,000      
Gross Amount, Land 253,000      
Gross Amount, Buildings and Fixtures 2,604,000      
Total 2,857,000      
Accumulated Depreciation (279,000)      
Net $ 2,578,000      
Date of Construction Dec. 31, 2009      
Retail Properties | Times Square at Craig Ranch | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | Times Square at Craig Ranch | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | Colonial Promenade Nord du Lac (Covington, LA) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 5,810,000      
Initial Cost Buildings and Fixtures 19,138,000      
Gross Amount, Land 5,810,000      
Gross Amount, Buildings and Fixtures 19,138,000      
Total 24,948,000      
Accumulated Depreciation (1,505,000)      
Net $ 23,443,000      
Date of Construction Dec. 31, 2010      
Retail Properties | Colonial Promenade Nord du Lac (Covington, LA) [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | Colonial Promenade Nord du Lac (Covington, LA) [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | Highlands of West Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 2,500,000      
Initial Cost Buildings and Fixtures 8,446,000      
Gross Amount, Land 2,500,000      
Gross Amount, Buildings and Fixtures 9,218,000      
Total 11,718,000      
Accumulated Depreciation (370,000)      
Net $ 11,348,000      
Date of Construction Dec. 31, 2012      
Retail Properties | Highlands of West Village [Member] | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | Highlands of West Village [Member] | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | Allure at Buckhead        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 867,000      
Initial Cost Buildings and Fixtures 3,465,000      
Gross Amount, Land 867,000      
Gross Amount, Buildings and Fixtures 3,473,000      
Total 4,340,000      
Accumulated Depreciation (424,000)      
Net $ 3,916,000      
Date of Construction Dec. 31, 2012      
Retail Properties | Allure at Buckhead | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | Allure at Buckhead | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | 1225 South Church        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost Land 43,000      
Initial Cost Buildings and Fixtures 199,000      
Gross Amount, Land 52,000      
Gross Amount, Buildings and Fixtures 441,000      
Total 493,000      
Accumulated Depreciation (67,000)      
Net $ 426,000      
Date of Construction Dec. 31, 2010      
Retail Properties | 1225 South Church | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Retail Properties | 1225 South Church | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Retail Properties | Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition $ 9,000      
Retail Properties | Land | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Land | Bella Casita at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Land | Times Square at Craig Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Land | Colonial Promenade Nord du Lac (Covington, LA) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Land | Highlands of West Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Land | Allure at Buckhead        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Land | 1225 South Church        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 9,000      
Retail Properties | Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 2,442,000      
Retail Properties | Buildings and Fixtures | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Buildings and Fixtures | Bella Casita at Las Colinas        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 126,000      
Retail Properties | Buildings and Fixtures | Times Square at Craig Ranch        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,294,000      
Retail Properties | Buildings and Fixtures | Colonial Promenade Nord du Lac (Covington, LA) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Retail Properties | Buildings and Fixtures | Highlands of West Village [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 772,000      
Retail Properties | Buildings and Fixtures | Allure at Buckhead        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 8,000      
Retail Properties | Buildings and Fixtures | 1225 South Church        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 242,000      
Development Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 17,545,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 17,545,000      
Gross Amount, Buildings and Fixtures 29,470,000      
Total 47,015,000      
Accumulated Depreciation (2,000)      
Net 47,013,000      
Development Properties | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 770,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 770,000      
Gross Amount, Buildings and Fixtures 734,000      
Total 1,504,000      
Accumulated Depreciation 0      
Net 1,504,000      
Development Properties | Colonial Promenade Huntsville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 2,700,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 2,700,000      
Gross Amount, Buildings and Fixtures 0      
Total 2,700,000      
Accumulated Depreciation 0      
Net 2,700,000      
Development Properties | Colonial Grand at Randal Lakes II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 3,200,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 3,200,000      
Gross Amount, Buildings and Fixtures 7,822,000      
Total 11,022,000      
Accumulated Depreciation (2,000)      
Net 11,020,000      
Development Properties | Station Square at Cosner's Corner        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 4,245,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 4,245,000      
Gross Amount, Buildings and Fixtures 14,256,000      
Total 18,501,000      
Accumulated Depreciation 0      
Net 18,501,000      
Development Properties | River's Walk II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 3,630,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 3,630,000      
Gross Amount, Buildings and Fixtures 6,026,000      
Total 9,656,000      
Accumulated Depreciation 0      
Net 9,656,000      
Development Properties | Retreat at West Creek II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 3,000,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 3,000,000      
Gross Amount, Buildings and Fixtures 632,000      
Total 3,632,000      
Accumulated Depreciation 0      
Net 3,632,000      
Development Properties | Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Land | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Land | Colonial Promenade Huntsville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Land | Colonial Grand at Randal Lakes II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Land | Station Square at Cosner's Corner        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Land | River's Walk II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Land | Retreat at West Creek II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 29,470,000      
Development Properties | Buildings and Fixtures | The Denton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 734,000      
Development Properties | Buildings and Fixtures | Colonial Promenade Huntsville [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Development Properties | Buildings and Fixtures | Colonial Grand at Randal Lakes II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 7,822,000      
Development Properties | Buildings and Fixtures | Station Square at Cosner's Corner        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 14,256,000      
Development Properties | Buildings and Fixtures | River's Walk II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 6,026,000      
Development Properties | Buildings and Fixtures | Retreat at West Creek II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 632,000      
Total Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 923,561,000      
Initial Cost Land 906,407,000      
Initial Cost Buildings and Fixtures 6,098,194,000      
Gross Amount, Land 926,532,000      
Gross Amount, Buildings and Fixtures 7,211,800,000      
Total 8,138,332,000      
Accumulated Depreciation (1,482,368,000)      
Net 6,655,964,000      
Total Properties | Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 20,125,000      
Total Properties | Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 1,113,606,000      
Land Held for Future Developments        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 51,779,000      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 51,779,000      
Gross Amount, Buildings and Fixtures 0      
Total 51,779,000      
Accumulated Depreciation 0      
Net 51,779,000      
Land Held for Future Developments | Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Land Held for Future Developments | Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition 0      
Total Other        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost Land 51,779,000      
Initial Cost Buildings and Fixtures 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Land 0      
Cost Capitalized subsequent to Acquisition 25,657,000      
Gross Amount, Land 51,779,000      
Gross Amount, Buildings and Fixtures 25,657,000      
Total 77,436,000      
Accumulated Depreciation (16,845,000)      
Net 60,591,000      
Corporate Real Estate Owned        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost Land 0      
Initial Cost Buildings and Fixtures 0      
Gross Amount, Land 0      
Gross Amount, Buildings and Fixtures 25,657,000      
Total 25,657,000      
Accumulated Depreciation (16,845,000)      
Net $ 8,812,000      
Corporate Real Estate Owned | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 40 years      
Corporate Real Estate Owned | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life used to compute depreciation in latest income statement 1 year      
Corporate Real Estate Owned | Land        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition $ 0      
Corporate Real Estate Owned | Buildings and Fixtures        
Real Estate and Accumulated Depreciation [Line Items]        
Cost Capitalized subsequent to Acquisition $ 25,657,000      
Phase I | Total Residential Properties | Colonial Village at Trussville        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1996      
Phase I | Total Residential Properties | Westside Creek I & II        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1984      
Phase I | Total Residential Properties | Paddock Club Lakeland        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1988      
Phase I | Total Residential Properties | Residences at Burlington Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2013      
Phase I | Total Residential Properties | Colonial Village at Greystone [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1998      
Phase I | Total Residential Properties | Colonial Grand at Autumn Park        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2001      
Phase I | Total Residential Properties | Colonial Village at Grapevine        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1985      
Phase II | Total Residential Properties | Colonial Village at Trussville        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1997      
Phase II | Total Residential Properties | Westside Creek I & II        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1986      
Phase II | Total Residential Properties | Paddock Club Lakeland        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1990      
Phase II | Total Residential Properties | Residences at Burlington Creek [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2014      
Phase II | Total Residential Properties | Colonial Village at Greystone [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2000      
Phase II | Total Residential Properties | Colonial Grand at Autumn Park        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2004      
Phase II | Total Residential Properties | Colonial Grand at Trinity Commons [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2002      
Phase II | Total Residential Properties | Glen Eagles [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 2000      
Phase II | Total Residential Properties | Colonial Village at Grapevine        
Real Estate and Accumulated Depreciation [Line Items]        
Date of Construction Dec. 31, 1986      
[1] Encumbered by a $240.0 million Fannie Mae facility, with $240.0 million available and outstanding with a variable interest rate of 0.80% on which there exists five interest rate caps totaling $125 million at an average rate of 4.60% at December 31, 2015.
[2] Encumbered by a $128 million loan with an outstanding balance of $128 million and a fixed interest rate of 5.08% which matures on June 10, 2021.