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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
apartment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrance $ 638,957    
Initial cost      
Land 2,990,109    
Buildings and improvements 10,427,618    
Costs capitalized subsequent to acquisition 2,212,200    
Gross amount carried at close of period      
Land and improvements 3,032,678    
Buildings and improvements 12,597,249    
Total 15,629,927    
Accumulated depreciation (4,646,854) $ (4,133,959) $ (3,689,482)
Aggregate cost for federal income tax purpose 12,200,000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Acquisition, development, and improvement of real estate 707,267 1,426,505 672,041
Disposition of real estate and other (139,085) (402,902) 0
Balance at the end of year 15,629,927    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at beginning of year 4,133,959 3,689,482 3,209,548
Depreciation expense 528,613 518,629 479,934
Depreciation expense - Disposals and other (15,718) (74,152) 0
Balance at the end of year $ 4,646,854 4,133,959 3,689,482
Encumbered Apartment Communities      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 3,025    
Encumbrance $ 638,957    
Initial cost      
Land 203,549    
Buildings and improvements 767,029    
Costs capitalized subsequent to acquisition 141,328    
Gross amount carried at close of period      
Land and improvements 207,899    
Buildings and improvements 904,007    
Total 1,111,906    
Accumulated depreciation (302,209)    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year 1,111,906    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 302,209    
Encumbered Apartment Communities | Belmont Station      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 275    
Encumbrance $ 29,753    
Initial cost      
Land 8,100    
Buildings and improvements 66,666    
Costs capitalized subsequent to acquisition 8,524    
Gross amount carried at close of period      
Land and improvements 8,267    
Buildings and improvements 75,023    
Total 83,290    
Accumulated depreciation $ (36,537)    
Date of construction 2009    
Date acquired Mar-09    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 83,290    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 36,537    
Encumbered Apartment Communities | Belmont Station | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Belmont Station | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Brio      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 300    
Encumbrance $ 96,310    
Initial cost      
Land 16,885    
Buildings and improvements 151,741    
Costs capitalized subsequent to acquisition 2,703    
Gross amount carried at close of period      
Land and improvements 16,885    
Buildings and improvements 154,444    
Total 171,329    
Accumulated depreciation $ (14,287)    
Date of construction 2015    
Date acquired Jun-19    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 171,329    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,287    
Encumbered Apartment Communities | Brio | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Brio | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Form 15      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 242    
Encumbrance $ 40,865    
Initial cost      
Land 24,510    
Buildings and improvements 72,221    
Costs capitalized subsequent to acquisition 12,459    
Gross amount carried at close of period      
Land and improvements 25,540    
Buildings and improvements 83,650    
Total 109,190    
Accumulated depreciation $ (17,211)    
Date of construction 2014    
Date acquired Mar-16    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 109,190    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 17,211    
Encumbered Apartment Communities | Form 15 | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Form 15 | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Fountain Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 705    
Encumbrance $ 82,775    
Initial cost      
Land 25,073    
Buildings and improvements 94,980    
Costs capitalized subsequent to acquisition 38,986    
Gross amount carried at close of period      
Land and improvements 25,203    
Buildings and improvements 133,836    
Total 159,039    
Accumulated depreciation $ (86,456)    
Date of construction 2002    
Date acquired Feb-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 159,039    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 86,456    
Encumbered Apartment Communities | Fountain Park | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Fountain Park | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Highridge      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 255    
Encumbrance $ 69,380    
Initial cost      
Land 5,419    
Buildings and improvements 18,347    
Costs capitalized subsequent to acquisition 34,262    
Gross amount carried at close of period      
Land and improvements 6,073    
Buildings and improvements 51,955    
Total 58,028    
Accumulated depreciation $ (43,677)    
Date of construction 1972    
Date acquired May-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 58,028    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 43,677    
Encumbered Apartment Communities | Highridge | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Highridge | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Magnolia Square/Magnolia Lane      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 188    
Encumbrance $ 52,335    
Initial cost      
Land 8,190    
Buildings and improvements 24,736    
Costs capitalized subsequent to acquisition 18,868    
Gross amount carried at close of period      
Land and improvements 8,191    
Buildings and improvements 43,603    
Total 51,794    
Accumulated depreciation $ (28,268)    
Date of construction 1963    
Date acquired Sep-07    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 51,794    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 28,268    
Encumbered Apartment Communities | Magnolia Square/Magnolia Lane | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Magnolia Square/Magnolia Lane | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Marquis      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 166    
Encumbrance $ 44,382    
Initial cost      
Land 20,495    
Buildings and improvements 47,823    
Costs capitalized subsequent to acquisition 337    
Gross amount carried at close of period      
Land and improvements 20,495    
Buildings and improvements 48,160    
Total 68,655    
Accumulated depreciation $ (4,939)    
Date of construction 2015    
Date acquired Dec-18    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 68,655    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 4,939    
Encumbered Apartment Communities | Marquis | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Marquis | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Sage at Cupertino      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 230    
Encumbrance $ 51,792    
Initial cost      
Land 35,719    
Buildings and improvements 53,449    
Costs capitalized subsequent to acquisition 11,506    
Gross amount carried at close of period      
Land and improvements 35,719    
Buildings and improvements 64,955    
Total 100,674    
Accumulated depreciation $ (12,988)    
Date of construction 1971    
Date acquired Mar-17    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 100,674    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,988    
Encumbered Apartment Communities | Sage at Cupertino | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Sage at Cupertino | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | The Barkley      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 161    
Encumbrance $ 14,890    
Initial cost      
Land 0    
Buildings and improvements 8,520    
Costs capitalized subsequent to acquisition 8,261    
Gross amount carried at close of period      
Land and improvements 2,353    
Buildings and improvements 14,428    
Total 16,781    
Accumulated depreciation $ (10,973)    
Date of construction 1984    
Date acquired Apr-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 16,781    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,973    
Encumbered Apartment Communities | The Barkley | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | The Barkley | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | The Dylan      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 184    
Encumbrance $ 58,145    
Initial cost      
Land 19,984    
Buildings and improvements 82,286    
Costs capitalized subsequent to acquisition 1,938    
Gross amount carried at close of period      
Land and improvements 19,990    
Buildings and improvements 84,218    
Total 104,208    
Accumulated depreciation $ (21,208)    
Date of construction 2015    
Date acquired Mar-15    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 104,208    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,208    
Encumbered Apartment Communities | The Dylan | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | The Dylan | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | The Huxley      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 187    
Encumbrance $ 52,936    
Initial cost      
Land 19,362    
Buildings and improvements 75,641    
Costs capitalized subsequent to acquisition 2,028    
Gross amount carried at close of period      
Land and improvements 19,371    
Buildings and improvements 77,660    
Total 97,031    
Accumulated depreciation $ (19,851)    
Date of construction 2014    
Date acquired Mar-15    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 97,031    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 19,851    
Encumbered Apartment Communities | The Huxley | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | The Huxley | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Township      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 132    
Encumbrance $ 45,394    
Initial cost      
Land 19,812    
Buildings and improvements 70,619    
Costs capitalized subsequent to acquisition 1,456    
Gross amount carried at close of period      
Land and improvements 19,812    
Buildings and improvements 72,075    
Total 91,887    
Accumulated depreciation $ (5,814)    
Date of construction 2014    
Date acquired Sep-19    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 91,887    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 5,814    
Encumbered Apartment Communities | Township | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Township | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Brookside Oaks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Brookside Oaks | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | City View | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | City View | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Domaine | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Domaine | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Fairhaven Apartments | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Fairhaven Apartments | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Foster's Landing | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Encumbered Apartment Communities | Foster's Landing | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Montanosa | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Encumbered Apartment Communities | Montanosa | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Montebello | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Montebello | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Montejo Apartments | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Montejo Apartments | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | 1000 Kiely | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | 1000 Kiely | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Valley Park | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Valley Park | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Encumbered Apartment Communities | Villa Angelina | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Villa Angelina | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 48,629    
Initial cost      
Land $ 2,705,854    
Buildings and improvements 9,644,002    
Costs capitalized subsequent to acquisition 2,054,750    
Gross amount carried at close of period      
Land and improvements 2,742,712    
Buildings and improvements 11,661,894    
Total 14,404,606    
Accumulated depreciation (4,327,622)    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year 14,404,606    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 4,327,622    
Unencumbered Apartment Communities | Agora      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 49    
Initial cost      
Land $ 4,932    
Buildings and improvements 60,423    
Costs capitalized subsequent to acquisition 296    
Gross amount carried at close of period      
Land and improvements 4,934    
Buildings and improvements 60,717    
Total 65,651    
Accumulated depreciation $ (4,084)    
Date of construction 2016    
Date acquired Jan-20    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 65,651    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 4,084    
Unencumbered Apartment Communities | Agora | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Agora | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Alessio      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 624    
Initial cost      
Land $ 32,136    
Buildings and improvements 128,543    
Costs capitalized subsequent to acquisition 15,445    
Gross amount carried at close of period      
Land and improvements 32,136    
Buildings and improvements 143,988    
Total 176,124    
Accumulated depreciation $ (44,124)    
Date of construction 2001    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 176,124    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 44,124    
Unencumbered Apartment Communities | Alessio | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Alessio | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Allegro      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 97    
Initial cost      
Land $ 5,869    
Buildings and improvements 23,977    
Costs capitalized subsequent to acquisition 3,227    
Gross amount carried at close of period      
Land and improvements 5,869    
Buildings and improvements 27,204    
Total 33,073    
Accumulated depreciation $ (12,316)    
Date of construction 2010    
Date acquired Oct-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 33,073    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,316    
Unencumbered Apartment Communities | Allegro | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Allegro | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Allure at Scripps Ranch      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 194    
Initial cost      
Land $ 11,923    
Buildings and improvements 47,690    
Costs capitalized subsequent to acquisition 2,901    
Gross amount carried at close of period      
Land and improvements 11,923    
Buildings and improvements 50,591    
Total 62,514    
Accumulated depreciation $ (14,257)    
Date of construction 2002    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 62,514    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,257    
Unencumbered Apartment Communities | Allure at Scripps Ranch | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Allure at Scripps Ranch | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Alpine Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 301    
Initial cost      
Land $ 4,967    
Buildings and improvements 19,728    
Costs capitalized subsequent to acquisition 10,820    
Gross amount carried at close of period      
Land and improvements 4,982    
Buildings and improvements 30,533    
Total 35,515    
Accumulated depreciation $ (19,816)    
Date of construction 1971    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 35,515    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 19,816    
Unencumbered Apartment Communities | Alpine Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Alpine Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Anavia      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 250    
Initial cost      
Land $ 15,925    
Buildings and improvements 63,712    
Costs capitalized subsequent to acquisition 10,627    
Gross amount carried at close of period      
Land and improvements 15,925    
Buildings and improvements 74,339    
Total 90,264    
Accumulated depreciation $ (28,240)    
Date of construction 2009    
Date acquired Dec-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 90,264    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 28,240    
Unencumbered Apartment Communities | Anavia | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Anavia | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Annaliese      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 56    
Initial cost      
Land $ 4,727    
Buildings and improvements 14,229    
Costs capitalized subsequent to acquisition 936    
Gross amount carried at close of period      
Land and improvements 4,726    
Buildings and improvements 15,166    
Total 19,892    
Accumulated depreciation $ (4,754)    
Date of construction 2009    
Date acquired Jan-13    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 19,892    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 4,754    
Unencumbered Apartment Communities | Annaliese | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Annaliese | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Apex      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 367    
Initial cost      
Land $ 44,240    
Buildings and improvements 103,251    
Costs capitalized subsequent to acquisition 7,635    
Gross amount carried at close of period      
Land and improvements 44,240    
Buildings and improvements 110,886    
Total 155,126    
Accumulated depreciation $ (27,525)    
Date of construction 2014    
Date acquired Aug-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 155,126    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 27,525    
Unencumbered Apartment Communities | Apex | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Apex | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Aqua Marina Del Rey      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 500    
Initial cost      
Land $ 58,442    
Buildings and improvements 175,326    
Costs capitalized subsequent to acquisition 19,162    
Gross amount carried at close of period      
Land and improvements 58,442    
Buildings and improvements 194,488    
Total 252,930    
Accumulated depreciation $ (60,202)    
Date of construction 2001    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 252,930    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 60,202    
Unencumbered Apartment Communities | Aqua Marina Del Rey | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Aqua Marina Del Rey | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Ascent      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 90    
Initial cost      
Land $ 3,924    
Buildings and improvements 11,862    
Costs capitalized subsequent to acquisition 2,542    
Gross amount carried at close of period      
Land and improvements 3,924    
Buildings and improvements 14,404    
Total 18,328    
Accumulated depreciation $ (5,432)    
Date of construction 1988    
Date acquired Oct-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 18,328    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 5,432    
Unencumbered Apartment Communities | Ascent | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Ascent | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Ashton Sherman Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 264    
Initial cost      
Land $ 23,550    
Buildings and improvements 93,811    
Costs capitalized subsequent to acquisition 2,126    
Gross amount carried at close of period      
Land and improvements 23,550    
Buildings and improvements 95,937    
Total 119,487    
Accumulated depreciation $ (17,140)    
Date of construction 2014    
Date acquired Dec-16    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 119,487    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 17,140    
Unencumbered Apartment Communities | Ashton Sherman Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Ashton Sherman Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Avant      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 440    
Initial cost      
Land $ 32,379    
Buildings and improvements 137,940    
Costs capitalized subsequent to acquisition 4,731    
Gross amount carried at close of period      
Land and improvements 32,379    
Buildings and improvements 142,671    
Total 175,050    
Accumulated depreciation $ (31,839)    
Date of construction 2014    
Date acquired Jun-15    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 175,050    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 31,839    
Unencumbered Apartment Communities | Avant | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Avant | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Avenue 64      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 224    
Initial cost      
Land $ 27,235    
Buildings and improvements 64,403    
Costs capitalized subsequent to acquisition 16,702    
Gross amount carried at close of period      
Land and improvements 27,235    
Buildings and improvements 81,105    
Total 108,340    
Accumulated depreciation $ (21,921)    
Date of construction 2007    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 108,340    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,921    
Unencumbered Apartment Communities | Avenue 64 | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Avenue 64 | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Aviara      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 166    
Initial cost      
Land $ 0    
Buildings and improvements 49,813    
Costs capitalized subsequent to acquisition 2,306    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 52,119    
Total 52,119    
Accumulated depreciation $ (15,548)    
Date of construction 2013    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 52,119    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,548    
Unencumbered Apartment Communities | Aviara | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Aviara | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Avondale at Warner Center      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 446    
Initial cost      
Land $ 10,536    
Buildings and improvements 24,522    
Costs capitalized subsequent to acquisition 27,959    
Gross amount carried at close of period      
Land and improvements 10,601    
Buildings and improvements 52,416    
Total 63,017    
Accumulated depreciation $ (39,034)    
Date of construction 1970    
Date acquired Jan-99    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 63,017    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 39,034    
Unencumbered Apartment Communities | Avondale at Warner Center | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Avondale at Warner Center | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bel Air      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 462    
Initial cost      
Land $ 12,105    
Buildings and improvements 18,252    
Costs capitalized subsequent to acquisition 45,326    
Gross amount carried at close of period      
Land and improvements 12,682    
Buildings and improvements 63,001    
Total 75,683    
Accumulated depreciation $ (47,118)    
Date of construction 1988    
Date acquired Jan-95    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 75,683    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 47,118    
Unencumbered Apartment Communities | Bel Air | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bel Air | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Belcarra      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 296    
Initial cost      
Land $ 21,725    
Buildings and improvements 92,091    
Costs capitalized subsequent to acquisition 3,756    
Gross amount carried at close of period      
Land and improvements 21,725    
Buildings and improvements 95,847    
Total 117,572    
Accumulated depreciation $ (26,579)    
Date of construction 2009    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 117,572    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 26,579    
Unencumbered Apartment Communities | Belcarra | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Belcarra | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bella Villagio      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 231    
Initial cost      
Land $ 17,247    
Buildings and improvements 40,343    
Costs capitalized subsequent to acquisition 5,204    
Gross amount carried at close of period      
Land and improvements 17,247    
Buildings and improvements 45,547    
Total 62,794    
Accumulated depreciation $ (18,493)    
Date of construction 2004    
Date acquired Sep-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 62,794    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,493    
Unencumbered Apartment Communities | Bella Villagio | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bella Villagio | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | BellCentre      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 249    
Initial cost      
Land $ 16,197    
Buildings and improvements 67,207    
Costs capitalized subsequent to acquisition 6,721    
Gross amount carried at close of period      
Land and improvements 16,197    
Buildings and improvements 73,928    
Total 90,125    
Accumulated depreciation $ (21,787)    
Date of construction 2001    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 90,125    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,787    
Unencumbered Apartment Communities | BellCentre | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | BellCentre | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bellerive      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 63    
Initial cost      
Land $ 5,401    
Buildings and improvements 21,803    
Costs capitalized subsequent to acquisition 1,467    
Gross amount carried at close of period      
Land and improvements 5,401    
Buildings and improvements 23,270    
Total 28,671    
Accumulated depreciation $ (9,362)    
Date of construction 2011    
Date acquired Aug-11    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 28,671    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,362    
Unencumbered Apartment Communities | Bellerive | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bellerive | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Belmont Terrace      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 71    
Initial cost      
Land $ 4,446    
Buildings and improvements 10,290    
Costs capitalized subsequent to acquisition 7,531    
Gross amount carried at close of period      
Land and improvements 4,473    
Buildings and improvements 17,794    
Total 22,267    
Accumulated depreciation $ (11,348)    
Date of construction 1974    
Date acquired Oct-06    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 22,267    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 11,348    
Unencumbered Apartment Communities | Belmont Terrace | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Belmont Terrace | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bennett Lofts      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 164    
Initial cost      
Land $ 21,771    
Buildings and improvements 50,800    
Costs capitalized subsequent to acquisition 32,121    
Gross amount carried at close of period      
Land and improvements 28,371    
Buildings and improvements 76,321    
Total 104,692    
Accumulated depreciation $ (25,807)    
Date of construction 2004    
Date acquired Dec-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 104,692    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 25,807    
Unencumbered Apartment Communities | Bennett Lofts | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bennett Lofts | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bernardo Crest      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 216    
Initial cost      
Land $ 10,802    
Buildings and improvements 43,209    
Costs capitalized subsequent to acquisition 6,290    
Gross amount carried at close of period      
Land and improvements 10,802    
Buildings and improvements 49,499    
Total 60,301    
Accumulated depreciation $ (14,756)    
Date of construction 1988    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 60,301    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,756    
Unencumbered Apartment Communities | Bernardo Crest | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Bernardo Crest | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bonita Cedars      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 120    
Initial cost      
Land $ 2,496    
Buildings and improvements 9,913    
Costs capitalized subsequent to acquisition 6,447    
Gross amount carried at close of period      
Land and improvements 2,503    
Buildings and improvements 16,353    
Total 18,856    
Accumulated depreciation $ (10,534)    
Date of construction 1983    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 18,856    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,534    
Unencumbered Apartment Communities | Bonita Cedars | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bonita Cedars | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Boulevard      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 172    
Initial cost      
Land $ 3,520    
Buildings and improvements 8,182    
Costs capitalized subsequent to acquisition 14,926    
Gross amount carried at close of period      
Land and improvements 3,580    
Buildings and improvements 23,048    
Total 26,628    
Accumulated depreciation $ (19,910)    
Date of construction 1978    
Date acquired Jan-96    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 26,628    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 19,910    
Unencumbered Apartment Communities | Boulevard | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Boulevard | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Brookside Oaks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 170    
Initial cost      
Land $ 7,301    
Buildings and improvements 16,310    
Costs capitalized subsequent to acquisition 27,812    
Gross amount carried at close of period      
Land and improvements 10,328    
Buildings and improvements 41,095    
Total 51,423    
Accumulated depreciation $ (28,453)    
Date of construction 1973    
Date acquired Jun-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 51,423    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 28,453    
Unencumbered Apartment Communities | Bridle Trails      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 108    
Initial cost      
Land $ 1,500    
Buildings and improvements 5,930    
Costs capitalized subsequent to acquisition 6,923    
Gross amount carried at close of period      
Land and improvements 1,531    
Buildings and improvements 12,822    
Total 14,353    
Accumulated depreciation $ (9,891)    
Date of construction 1986    
Date acquired Oct-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 14,353    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,891    
Unencumbered Apartment Communities | Bridle Trails | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bridle Trails | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Brighton Ridge      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 264    
Initial cost      
Land $ 2,623    
Buildings and improvements 10,800    
Costs capitalized subsequent to acquisition 7,844    
Gross amount carried at close of period      
Land and improvements 2,656    
Buildings and improvements 18,611    
Total 21,267    
Accumulated depreciation $ (14,331)    
Date of construction 1986    
Date acquired Dec-96    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 21,267    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,331    
Unencumbered Apartment Communities | Brighton Ridge | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Brighton Ridge | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bristol Commons      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 188    
Initial cost      
Land $ 5,278    
Buildings and improvements 11,853    
Costs capitalized subsequent to acquisition 10,788    
Gross amount carried at close of period      
Land and improvements 5,293    
Buildings and improvements 22,626    
Total 27,919    
Accumulated depreciation $ (18,121)    
Date of construction 1989    
Date acquired Jan-95    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 27,919    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,121    
Unencumbered Apartment Communities | Bristol Commons | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bristol Commons | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Bunker Hill      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 456    
Initial cost      
Land $ 11,498    
Buildings and improvements 27,871    
Costs capitalized subsequent to acquisition 99,814    
Gross amount carried at close of period      
Land and improvements 11,639    
Buildings and improvements 127,544    
Total 139,183    
Accumulated depreciation $ (89,600)    
Date of construction 1968    
Date acquired Mar-98    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 139,183    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 89,600    
Unencumbered Apartment Communities | Bunker Hill | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Bunker Hill | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Camarillo Oaks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 564    
Initial cost      
Land $ 10,953    
Buildings and improvements 25,254    
Costs capitalized subsequent to acquisition 9,169    
Gross amount carried at close of period      
Land and improvements 11,075    
Buildings and improvements 34,301    
Total 45,376    
Accumulated depreciation $ (28,193)    
Date of construction 1985    
Date acquired Jul-96    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 45,376    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 28,193    
Unencumbered Apartment Communities | Camarillo Oaks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Camarillo Oaks | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Cambridge Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 320    
Initial cost      
Land $ 18,185    
Buildings and improvements 72,739    
Costs capitalized subsequent to acquisition 5,616    
Gross amount carried at close of period      
Land and improvements 18,185    
Buildings and improvements 78,355    
Total 96,540    
Accumulated depreciation $ (22,506)    
Date of construction 1998    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 96,540    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 22,506    
Unencumbered Apartment Communities | Cambridge Park | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Cambridge Park | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Camino Ruiz Square      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 159    
Initial cost      
Land $ 6,871    
Buildings and improvements 26,119    
Costs capitalized subsequent to acquisition 2,975    
Gross amount carried at close of period      
Land and improvements 6,931    
Buildings and improvements 29,034    
Total 35,965    
Accumulated depreciation $ (14,907)    
Date of construction 1990    
Date acquired Dec-06    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 35,965    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,907    
Unencumbered Apartment Communities | Camino Ruiz Square | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Camino Ruiz Square | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Canvas      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 123    
Initial cost      
Land $ 10,489    
Buildings and improvements 36,924    
Costs capitalized subsequent to acquisition 56    
Gross amount carried at close of period      
Land and improvements 10,489    
Buildings and improvements 36,980    
Total 47,469    
Accumulated depreciation $ (46)    
Date of construction 2014    
Date acquired Dec-21    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 47,469    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 46    
Unencumbered Apartment Communities | Canvas | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Canvas | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Canyon Oaks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 250    
Initial cost      
Land $ 19,088    
Buildings and improvements 44,473    
Costs capitalized subsequent to acquisition 7,995    
Gross amount carried at close of period      
Land and improvements 19,088    
Buildings and improvements 52,468    
Total 71,556    
Accumulated depreciation $ (25,767)    
Date of construction 2005    
Date acquired May-07    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 71,556    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 25,767    
Unencumbered Apartment Communities | Canyon Oaks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Canyon Oaks | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Canyon Pointe      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 250    
Initial cost      
Land $ 4,692    
Buildings and improvements 18,288    
Costs capitalized subsequent to acquisition 10,200    
Gross amount carried at close of period      
Land and improvements 4,693    
Buildings and improvements 28,487    
Total 33,180    
Accumulated depreciation $ (18,548)    
Date of construction 1990    
Date acquired Oct-03    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 33,180    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,548    
Unencumbered Apartment Communities | Canyon Pointe | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Canyon Pointe | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Capri at Sunny Hills      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 102    
Initial cost      
Land $ 3,337    
Buildings and improvements 13,320    
Costs capitalized subsequent to acquisition 10,017    
Gross amount carried at close of period      
Land and improvements 4,048    
Buildings and improvements 22,626    
Total 26,674    
Accumulated depreciation $ (16,217)    
Date of construction 1961    
Date acquired Sep-01    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 26,674    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,217    
Unencumbered Apartment Communities | Capri at Sunny Hills | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Capri at Sunny Hills | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Carmel Creek      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 348    
Initial cost      
Land $ 26,842    
Buildings and improvements 107,368    
Costs capitalized subsequent to acquisition 9,452    
Gross amount carried at close of period      
Land and improvements 26,842    
Buildings and improvements 116,820    
Total 143,662    
Accumulated depreciation $ (34,832)    
Date of construction 2000    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 143,662    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 34,832    
Unencumbered Apartment Communities | Carmel Creek | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Carmel Creek | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Carmel Landing      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 356    
Initial cost      
Land $ 16,725    
Buildings and improvements 66,901    
Costs capitalized subsequent to acquisition 11,985    
Gross amount carried at close of period      
Land and improvements 16,725    
Buildings and improvements 78,886    
Total 95,611    
Accumulated depreciation $ (23,860)    
Date of construction 1989    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 95,611    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 23,860    
Unencumbered Apartment Communities | Carmel Landing | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Carmel Landing | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Carmel Summit      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 246    
Initial cost      
Land $ 14,968    
Buildings and improvements 59,871    
Costs capitalized subsequent to acquisition 5,485    
Gross amount carried at close of period      
Land and improvements 14,968    
Buildings and improvements 65,356    
Total 80,324    
Accumulated depreciation $ (18,885)    
Date of construction 1989    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 80,324    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,885    
Unencumbered Apartment Communities | Carmel Summit | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Carmel Summit | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Castle Creek      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 216    
Initial cost      
Land $ 4,149    
Buildings and improvements 16,028    
Costs capitalized subsequent to acquisition 6,116    
Gross amount carried at close of period      
Land and improvements 4,833    
Buildings and improvements 21,460    
Total 26,293    
Accumulated depreciation $ (16,945)    
Date of construction 1998    
Date acquired Dec-98    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 26,293    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,945    
Unencumbered Apartment Communities | Castle Creek | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Castle Creek | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Catalina Gardens      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 128    
Initial cost      
Land $ 6,714    
Buildings and improvements 26,856    
Costs capitalized subsequent to acquisition 2,749    
Gross amount carried at close of period      
Land and improvements 6,714    
Buildings and improvements 29,605    
Total 36,319    
Accumulated depreciation $ (8,556)    
Date of construction 1987    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 36,319    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,556    
Unencumbered Apartment Communities | Catalina Gardens | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Catalina Gardens | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | CBC Apartments & The Sweeps      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 239    
Initial cost      
Land $ 11,841    
Buildings and improvements 45,320    
Costs capitalized subsequent to acquisition 7,309    
Gross amount carried at close of period      
Land and improvements 11,906    
Buildings and improvements 52,564    
Total 64,470    
Accumulated depreciation $ (30,261)    
Date of construction 1962    
Date acquired Jan-06    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 64,470    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 30,261    
Unencumbered Apartment Communities | CBC Apartments & The Sweeps | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | CBC Apartments & The Sweeps | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Cedar Terrace      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 180    
Initial cost      
Land $ 5,543    
Buildings and improvements 16,442    
Costs capitalized subsequent to acquisition 9,084    
Gross amount carried at close of period      
Land and improvements 5,652    
Buildings and improvements 25,417    
Total 31,069    
Accumulated depreciation $ (15,207)    
Date of construction 1984    
Date acquired Jan-05    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 31,069    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,207    
Unencumbered Apartment Communities | Cedar Terrace | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Cedar Terrace | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | CentrePointe      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 224    
Initial cost      
Land $ 3,405    
Buildings and improvements 7,743    
Costs capitalized subsequent to acquisition 22,728    
Gross amount carried at close of period      
Land and improvements 3,442    
Buildings and improvements 30,434    
Total 33,876    
Accumulated depreciation $ (24,211)    
Date of construction 1974    
Date acquired Jun-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 33,876    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 24,211    
Unencumbered Apartment Communities | CentrePointe | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | CentrePointe | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Chestnut Street Apartments      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 96    
Initial cost      
Land $ 6,582    
Buildings and improvements 15,689    
Costs capitalized subsequent to acquisition 2,356    
Gross amount carried at close of period      
Land and improvements 6,582    
Buildings and improvements 18,045    
Total 24,627    
Accumulated depreciation $ (8,572)    
Date of construction 2002    
Date acquired Jul-08    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 24,627    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,572    
Unencumbered Apartment Communities | Chestnut Street Apartments | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Chestnut Street Apartments | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | City View      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 572    
Initial cost      
Land $ 9,883    
Buildings and improvements 37,670    
Costs capitalized subsequent to acquisition 34,786    
Gross amount carried at close of period      
Land and improvements 10,350    
Buildings and improvements 71,989    
Total 82,339    
Accumulated depreciation $ (56,516)    
Date of construction 1975    
Date acquired Mar-98    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 82,339    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 56,516    
Unencumbered Apartment Communities | Collins on Pine      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 76    
Initial cost      
Land $ 7,276    
Buildings and improvements 22,226    
Costs capitalized subsequent to acquisition 879    
Gross amount carried at close of period      
Land and improvements 7,276    
Buildings and improvements 23,105    
Total 30,381    
Accumulated depreciation $ (6,037)    
Date of construction 2013    
Date acquired May-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 30,381    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 6,037    
Unencumbered Apartment Communities | Collins on Pine | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Collins on Pine | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Connolly Station      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 309    
Initial cost      
Land $ 19,949    
Buildings and improvements 123,428    
Costs capitalized subsequent to acquisition 3,187    
Gross amount carried at close of period      
Land and improvements 19,949    
Buildings and improvements 126,615    
Total 146,564    
Accumulated depreciation $ (8,762)    
Date of construction 2014    
Date acquired Jan-20    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 146,564    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,762    
Unencumbered Apartment Communities | Connolly Station | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Connolly Station | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Corbella at Juanita Bay      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 169    
Initial cost      
Land $ 5,801    
Buildings and improvements 17,415    
Costs capitalized subsequent to acquisition 4,364    
Gross amount carried at close of period      
Land and improvements 5,801    
Buildings and improvements 21,779    
Total 27,580    
Accumulated depreciation $ (9,249)    
Date of construction 1978    
Date acquired Nov-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 27,580    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,249    
Unencumbered Apartment Communities | Corbella at Juanita Bay | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Corbella at Juanita Bay | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Cortesia      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 308    
Initial cost      
Land $ 13,912    
Buildings and improvements 55,649    
Costs capitalized subsequent to acquisition 4,062    
Gross amount carried at close of period      
Land and improvements 13,912    
Buildings and improvements 59,711    
Total 73,623    
Accumulated depreciation $ (17,177)    
Date of construction 1999    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 73,623    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 17,177    
Unencumbered Apartment Communities | Cortesia | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Cortesia | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Country Villas      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 180    
Initial cost      
Land $ 4,174    
Buildings and improvements 16,583    
Costs capitalized subsequent to acquisition 6,534    
Gross amount carried at close of period      
Land and improvements 4,187    
Buildings and improvements 23,104    
Total 27,291    
Accumulated depreciation $ (14,946)    
Date of construction 1976    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 27,291    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,946    
Unencumbered Apartment Communities | Country Villas | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Country Villas | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Courtyard off Main      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 110    
Initial cost      
Land $ 7,465    
Buildings and improvements 21,405    
Costs capitalized subsequent to acquisition 5,208    
Gross amount carried at close of period      
Land and improvements 7,465    
Buildings and improvements 26,613    
Total 34,078    
Accumulated depreciation $ (11,438)    
Date of construction 2000    
Date acquired Oct-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 34,078    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 11,438    
Unencumbered Apartment Communities | Courtyard off Main | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Courtyard off Main | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Crow Canyon      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 400    
Initial cost      
Land $ 37,579    
Buildings and improvements 87,685    
Costs capitalized subsequent to acquisition 13,903    
Gross amount carried at close of period      
Land and improvements 37,579    
Buildings and improvements 101,588    
Total 139,167    
Accumulated depreciation $ (31,438)    
Date of construction 1992    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 139,167    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 31,438    
Unencumbered Apartment Communities | Crow Canyon | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Crow Canyon | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Deer Valley      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 171    
Initial cost      
Land $ 21,478    
Buildings and improvements 50,116    
Costs capitalized subsequent to acquisition 4,996    
Gross amount carried at close of period      
Land and improvements 21,478    
Buildings and improvements 55,112    
Total 76,590    
Accumulated depreciation $ (15,897)    
Date of construction 1996    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 76,590    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,897    
Unencumbered Apartment Communities | Deer Valley | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Deer Valley | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Domaine      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 92    
Initial cost      
Land $ 9,059    
Buildings and improvements 27,177    
Costs capitalized subsequent to acquisition 1,676    
Gross amount carried at close of period      
Land and improvements 9,059    
Buildings and improvements 28,853    
Total 37,912    
Accumulated depreciation $ (9,441)    
Date of construction 2009    
Date acquired Sep-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 37,912    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,441    
Unencumbered Apartment Communities | Elevation      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 158    
Initial cost      
Land $ 4,758    
Buildings and improvements 14,285    
Costs capitalized subsequent to acquisition 8,183    
Gross amount carried at close of period      
Land and improvements 4,757    
Buildings and improvements 22,469    
Total 27,226    
Accumulated depreciation $ (11,902)    
Date of construction 1986    
Date acquired Jun-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 27,226    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 11,902    
Unencumbered Apartment Communities | Elevation | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Elevation | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Ellington      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 220    
Initial cost      
Land $ 15,066    
Buildings and improvements 45,249    
Costs capitalized subsequent to acquisition 4,958    
Gross amount carried at close of period      
Land and improvements 15,066    
Buildings and improvements 50,207    
Total 65,273    
Accumulated depreciation $ (13,947)    
Date of construction 1994    
Date acquired Jul-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 65,273    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,947    
Unencumbered Apartment Communities | Ellington | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Ellington | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Emerald Pointe      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 160    
Initial cost      
Land $ 8,458    
Buildings and improvements 33,832    
Costs capitalized subsequent to acquisition 2,837    
Gross amount carried at close of period      
Land and improvements 8,458    
Buildings and improvements 36,669    
Total 45,127    
Accumulated depreciation $ (10,712)    
Date of construction 1989    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 45,127    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,712    
Unencumbered Apartment Communities | Emerald Pointe | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Emerald Pointe | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Emerald Ridge      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 180    
Initial cost      
Land $ 3,449    
Buildings and improvements 7,801    
Costs capitalized subsequent to acquisition 7,327    
Gross amount carried at close of period      
Land and improvements 3,449    
Buildings and improvements 15,128    
Total 18,577    
Accumulated depreciation $ (12,609)    
Date of construction 1987    
Date acquired Nov-94    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 18,577    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,609    
Unencumbered Apartment Communities | Emerald Ridge | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Emerald Ridge | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Emerson Valley Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 144    
Initial cost      
Land $ 13,378    
Buildings and improvements 53,240    
Costs capitalized subsequent to acquisition 1,623    
Gross amount carried at close of period      
Land and improvements 13,378    
Buildings and improvements 54,863    
Total 68,241    
Accumulated depreciation $ (9,894)    
Date of construction 2012    
Date acquired Dec-16    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 68,241    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,894    
Unencumbered Apartment Communities | Emerson Valley Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Emerson Valley Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Emme      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 190    
Initial cost      
Land $ 15,039    
Buildings and improvements 80,532    
Costs capitalized subsequent to acquisition 862    
Gross amount carried at close of period      
Land and improvements 15,039    
Buildings and improvements 81,394    
Total 96,433    
Accumulated depreciation $ (5,594)    
Date of construction 2015    
Date acquired Jan-20    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 96,433    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 5,594    
Unencumbered Apartment Communities | Emme | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Emme | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Enso      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 183    
Initial cost      
Land $ 21,397    
Buildings and improvements 71,135    
Costs capitalized subsequent to acquisition 2,269    
Gross amount carried at close of period      
Land and improvements 21,397    
Buildings and improvements 73,404    
Total 94,801    
Accumulated depreciation $ (15,853)    
Date of construction 2014    
Date acquired Dec-15    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 94,801    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,853    
Unencumbered Apartment Communities | Enso | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Enso | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Epic      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 769    
Initial cost      
Land $ 89,111    
Buildings and improvements 307,769    
Costs capitalized subsequent to acquisition 1,236    
Gross amount carried at close of period      
Land and improvements 89,111    
Buildings and improvements 309,005    
Total 398,116    
Accumulated depreciation $ (21,058)    
Date of construction 2013    
Date acquired Jan-20    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 398,116    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,058    
Unencumbered Apartment Communities | Epic | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Epic | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Esplanade      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 278    
Initial cost      
Land $ 18,170    
Buildings and improvements 40,086    
Costs capitalized subsequent to acquisition 16,663    
Gross amount carried at close of period      
Land and improvements 18,429    
Buildings and improvements 56,490    
Total 74,919    
Accumulated depreciation $ (35,389)    
Date of construction 2002    
Date acquired Apr-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 74,919    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 35,389    
Unencumbered Apartment Communities | Esplanade | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Esplanade | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Essex Skyline      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 350    
Initial cost      
Land $ 21,537    
Buildings and improvements 146,099    
Costs capitalized subsequent to acquisition 14,867    
Gross amount carried at close of period      
Land and improvements 21,537    
Buildings and improvements 160,966    
Total 182,503    
Accumulated depreciation $ (54,862)    
Date of construction 2008    
Date acquired Apr-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 182,503    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 54,862    
Unencumbered Apartment Communities | Essex Skyline | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Essex Skyline | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Evergreen Heights      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 200    
Initial cost      
Land $ 3,566    
Buildings and improvements 13,395    
Costs capitalized subsequent to acquisition 7,687    
Gross amount carried at close of period      
Land and improvements 3,649    
Buildings and improvements 20,999    
Total 24,648    
Accumulated depreciation $ (16,769)    
Date of construction 1990    
Date acquired Jun-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 24,648    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,769    
Unencumbered Apartment Communities | Evergreen Heights | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Evergreen Heights | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Fairhaven Apartments      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 164    
Initial cost      
Land $ 2,626    
Buildings and improvements 10,485    
Costs capitalized subsequent to acquisition 10,846    
Gross amount carried at close of period      
Land and improvements 2,957    
Buildings and improvements 21,000    
Total 23,957    
Accumulated depreciation $ (14,951)    
Date of construction 1970    
Date acquired Nov-01    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 23,957    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,951    
Unencumbered Apartment Communities | Fairway Apartments at Big Canyon      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 74    
Initial cost      
Land $ 0    
Buildings and improvements 7,850    
Costs capitalized subsequent to acquisition 8,838    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 16,688    
Total 16,688    
Accumulated depreciation $ (13,662)    
Date of construction 1972    
Date acquired Jun-99    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 16,688    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,662    
Unencumbered Apartment Communities | Fairway Apartments at Big Canyon | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Fairway Apartments at Big Canyon | Maximum      
Gross amount carried at close of period      
Life used for depreciation 28 years    
Unencumbered Apartment Communities | Fairwood Pond      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 194    
Initial cost      
Land $ 5,296    
Buildings and improvements 15,564    
Costs capitalized subsequent to acquisition 4,968    
Gross amount carried at close of period      
Land and improvements 5,297    
Buildings and improvements 20,531    
Total 25,828    
Accumulated depreciation $ (12,391)    
Date of construction 1997    
Date acquired Oct-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 25,828    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,391    
Unencumbered Apartment Communities | Fairwood Pond | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Fairwood Pond | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Foothill Commons      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 394    
Initial cost      
Land $ 2,435    
Buildings and improvements 9,821    
Costs capitalized subsequent to acquisition 42,736    
Gross amount carried at close of period      
Land and improvements 2,440    
Buildings and improvements 52,552    
Total 54,992    
Accumulated depreciation $ (48,909)    
Date of construction 1978    
Date acquired Mar-90    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 54,992    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 48,909    
Unencumbered Apartment Communities | Foothill Commons | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Foothill Commons | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Foothill Gardens/Twin Creeks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 176    
Initial cost      
Land $ 5,875    
Buildings and improvements 13,992    
Costs capitalized subsequent to acquisition 12,942    
Gross amount carried at close of period      
Land and improvements 5,964    
Buildings and improvements 26,845    
Total 32,809    
Accumulated depreciation $ (21,358)    
Date of construction 1985    
Date acquired Feb-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 32,809    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,358    
Unencumbered Apartment Communities | Foothill Gardens/Twin Creeks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Foothill Gardens/Twin Creeks | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Forest View      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 192    
Initial cost      
Land $ 3,731    
Buildings and improvements 14,530    
Costs capitalized subsequent to acquisition 4,323    
Gross amount carried at close of period      
Land and improvements 3,731    
Buildings and improvements 18,853    
Total 22,584    
Accumulated depreciation $ (11,443)    
Date of construction 1998    
Date acquired Oct-03    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 22,584    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 11,443    
Unencumbered Apartment Communities | Forest View | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Forest View | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Foster's Landing      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 490    
Initial cost      
Land $ 61,714    
Buildings and improvements 144,000    
Costs capitalized subsequent to acquisition 13,398    
Gross amount carried at close of period      
Land and improvements 61,714    
Buildings and improvements 157,398    
Total 219,112    
Accumulated depreciation $ (47,256)    
Date of construction 1987    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 219,112    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 47,256    
Unencumbered Apartment Communities | Fountain Court      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 320    
Initial cost      
Land $ 6,702    
Buildings and improvements 27,306    
Costs capitalized subsequent to acquisition 14,395    
Gross amount carried at close of period      
Land and improvements 6,985    
Buildings and improvements 41,418    
Total 48,403    
Accumulated depreciation $ (31,728)    
Date of construction 2000    
Date acquired Mar-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 48,403    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 31,728    
Unencumbered Apartment Communities | Fountain Court | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Fountain Court | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Fountains at River Oaks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 226    
Initial cost      
Land $ 26,046    
Buildings and improvements 60,773    
Costs capitalized subsequent to acquisition 7,233    
Gross amount carried at close of period      
Land and improvements 26,046    
Buildings and improvements 68,006    
Total 94,052    
Accumulated depreciation $ (20,492)    
Date of construction 1990    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 94,052    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 20,492    
Unencumbered Apartment Communities | Fountains at River Oaks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Fountains at River Oaks | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Fourth & U      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 171    
Initial cost      
Land $ 8,879    
Buildings and improvements 52,351    
Costs capitalized subsequent to acquisition 4,549    
Gross amount carried at close of period      
Land and improvements 8,879    
Buildings and improvements 56,900    
Total 65,779    
Accumulated depreciation $ (23,644)    
Date of construction 2010    
Date acquired Apr-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 65,779    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 23,644    
Unencumbered Apartment Communities | Fourth & U | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Fourth & U | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Fox Plaza      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 445    
Initial cost      
Land $ 39,731    
Buildings and improvements 92,706    
Costs capitalized subsequent to acquisition 40,959    
Gross amount carried at close of period      
Land and improvements 39,731    
Buildings and improvements 133,665    
Total 173,396    
Accumulated depreciation $ (49,126)    
Date of construction 1968    
Date acquired Feb-13    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 173,396    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 49,126    
Unencumbered Apartment Communities | Fox Plaza | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Fox Plaza | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Henley I/The Henley II      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 215    
Initial cost      
Land $ 6,695    
Buildings and improvements 16,753    
Costs capitalized subsequent to acquisition 29,753    
Gross amount carried at close of period      
Land and improvements 6,733    
Buildings and improvements 46,468    
Total 53,201    
Accumulated depreciation $ (33,723)    
Date of construction 1970    
Date acquired Jun-99    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 53,201    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 33,723    
Unencumbered Apartment Communities | The Henley I/The Henley II | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Henley I/The Henley II | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Highlands at Wynhaven      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 333    
Initial cost      
Land $ 16,271    
Buildings and improvements 48,932    
Costs capitalized subsequent to acquisition 16,389    
Gross amount carried at close of period      
Land and improvements 16,271    
Buildings and improvements 65,321    
Total 81,592    
Accumulated depreciation $ (33,737)    
Date of construction 2000    
Date acquired Aug-08    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 81,592    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 33,737    
Unencumbered Apartment Communities | Highlands at Wynhaven | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Highlands at Wynhaven | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Hillcrest Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 608    
Initial cost      
Land $ 15,318    
Buildings and improvements 40,601    
Costs capitalized subsequent to acquisition 23,567    
Gross amount carried at close of period      
Land and improvements 15,755    
Buildings and improvements 63,731    
Total 79,486    
Accumulated depreciation $ (47,883)    
Date of construction 1973    
Date acquired Mar-98    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 79,486    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 47,883    
Unencumbered Apartment Communities | Hillcrest Park | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Hillcrest Park | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Hillsdale Garden      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 697    
Initial cost      
Land $ 22,000    
Buildings and improvements 94,681    
Costs capitalized subsequent to acquisition 35,010    
Gross amount carried at close of period      
Land and improvements 22,000    
Buildings and improvements 129,691    
Total 151,691    
Accumulated depreciation $ (69,587)    
Date of construction 1948    
Date acquired Sep-06    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 151,691    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 69,587    
Unencumbered Apartment Communities | Hillsdale Garden | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Hillsdale Garden | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Hope Ranch      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 108    
Initial cost      
Land $ 4,078    
Buildings and improvements 16,877    
Costs capitalized subsequent to acquisition 3,291    
Gross amount carried at close of period      
Land and improvements 4,208    
Buildings and improvements 20,038    
Total 24,246    
Accumulated depreciation $ (10,325)    
Date of construction 1965    
Date acquired Mar-07    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 24,246    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,325    
Unencumbered Apartment Communities | Hope Ranch | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Hope Ranch | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Huntington Breakers      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 342    
Initial cost      
Land $ 9,306    
Buildings and improvements 22,720    
Costs capitalized subsequent to acquisition 24,559    
Gross amount carried at close of period      
Land and improvements 9,315    
Buildings and improvements 47,270    
Total 56,585    
Accumulated depreciation $ (37,323)    
Date of construction 1984    
Date acquired Oct-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 56,585    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 37,323    
Unencumbered Apartment Communities | Huntington Breakers | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Huntington Breakers | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Inglenook Court      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 224    
Initial cost      
Land $ 3,467    
Buildings and improvements 7,881    
Costs capitalized subsequent to acquisition 8,968    
Gross amount carried at close of period      
Land and improvements 3,474    
Buildings and improvements 16,842    
Total 20,316    
Accumulated depreciation $ (14,569)    
Date of construction 1985    
Date acquired Oct-94    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 20,316    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,569    
Unencumbered Apartment Communities | Inglenook Court | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Inglenook Court | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Lafayette Highlands      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 150    
Initial cost      
Land $ 17,774    
Buildings and improvements 41,473    
Costs capitalized subsequent to acquisition 5,714    
Gross amount carried at close of period      
Land and improvements 17,774    
Buildings and improvements 47,187    
Total 64,961    
Accumulated depreciation $ (13,685)    
Date of construction 1973    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 64,961    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,685    
Unencumbered Apartment Communities | Lafayette Highlands | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Lafayette Highlands | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Lakeshore Landing      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 308    
Initial cost      
Land $ 38,155    
Buildings and improvements 89,028    
Costs capitalized subsequent to acquisition 10,707    
Gross amount carried at close of period      
Land and improvements 38,155    
Buildings and improvements 99,735    
Total 137,890    
Accumulated depreciation $ (30,522)    
Date of construction 1988    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 137,890    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 30,522    
Unencumbered Apartment Communities | Lakeshore Landing | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Lakeshore Landing | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Laurels at Mill Creek      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 164    
Initial cost      
Land $ 1,559    
Buildings and improvements 6,430    
Costs capitalized subsequent to acquisition 8,812    
Gross amount carried at close of period      
Land and improvements 1,595    
Buildings and improvements 15,206    
Total 16,801    
Accumulated depreciation $ (12,054)    
Date of construction 1981    
Date acquired Dec-96    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 16,801    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,054    
Unencumbered Apartment Communities | Laurels at Mill Creek | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Laurels at Mill Creek | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Lawrence Station      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 336    
Initial cost      
Land $ 45,532    
Buildings and improvements 106,735    
Costs capitalized subsequent to acquisition 4,742    
Gross amount carried at close of period      
Land and improvements 45,532    
Buildings and improvements 111,477    
Total 157,009    
Accumulated depreciation $ (34,531)    
Date of construction 2012    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 157,009    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 34,531    
Unencumbered Apartment Communities | Lawrence Station | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Lawrence Station | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Le Parc      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 140    
Initial cost      
Land $ 3,090    
Buildings and improvements 7,421    
Costs capitalized subsequent to acquisition 14,363    
Gross amount carried at close of period      
Land and improvements 3,092    
Buildings and improvements 21,782    
Total 24,874    
Accumulated depreciation $ (18,258)    
Date of construction 1975    
Date acquired Feb-94    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 24,874    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,258    
Unencumbered Apartment Communities | Le Parc | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Le Parc | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Marbrisa      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 202    
Initial cost      
Land $ 4,700    
Buildings and improvements 18,605    
Costs capitalized subsequent to acquisition 10,670    
Gross amount carried at close of period      
Land and improvements 4,760    
Buildings and improvements 29,215    
Total 33,975    
Accumulated depreciation $ (20,160)    
Date of construction 1987    
Date acquired Sep-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 33,975    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 20,160    
Unencumbered Apartment Communities | Marbrisa | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Marbrisa | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Marina City Club      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 101    
Initial cost      
Land $ 0    
Buildings and improvements 28,167    
Costs capitalized subsequent to acquisition 34,252    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 62,419    
Total 62,419    
Accumulated depreciation $ (34,917)    
Date of construction 1971    
Date acquired Jan-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 62,419    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 34,917    
Unencumbered Apartment Communities | Marina City Club | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Marina City Club | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Marina Cove      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 292    
Initial cost      
Land $ 5,320    
Buildings and improvements 16,431    
Costs capitalized subsequent to acquisition 16,681    
Gross amount carried at close of period      
Land and improvements 5,324    
Buildings and improvements 33,108    
Total 38,432    
Accumulated depreciation $ (29,473)    
Date of construction 1974    
Date acquired Jun-94    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 38,432    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 29,473    
Unencumbered Apartment Communities | Marina Cove | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Marina Cove | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mariner's Place      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 105    
Initial cost      
Land $ 1,555    
Buildings and improvements 6,103    
Costs capitalized subsequent to acquisition 3,073    
Gross amount carried at close of period      
Land and improvements 1,562    
Buildings and improvements 9,169    
Total 10,731    
Accumulated depreciation $ (6,703)    
Date of construction 1987    
Date acquired May-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 10,731    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 6,703    
Unencumbered Apartment Communities | Mariner's Place | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mariner's Place | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | MB 360      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 360    
Initial cost      
Land $ 42,001    
Buildings and improvements 212,648    
Costs capitalized subsequent to acquisition 13,804    
Gross amount carried at close of period      
Land and improvements 42,001    
Buildings and improvements 226,452    
Total 268,453    
Accumulated depreciation $ (58,207)    
Date of construction 2014    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 268,453    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 58,207    
Unencumbered Apartment Communities | MB 360 | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | MB 360 | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mesa Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 133    
Initial cost      
Land $ 1,888    
Buildings and improvements 7,498    
Costs capitalized subsequent to acquisition 3,068    
Gross amount carried at close of period      
Land and improvements 1,894    
Buildings and improvements 10,560    
Total 12,454    
Accumulated depreciation $ (6,649)    
Date of construction 1963    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 12,454    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 6,649    
Unencumbered Apartment Communities | Mesa Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mesa Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mill Creek at Windermere      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 400    
Initial cost      
Land $ 29,551    
Buildings and improvements 69,032    
Costs capitalized subsequent to acquisition 9,770    
Gross amount carried at close of period      
Land and improvements 29,551    
Buildings and improvements 78,802    
Total 108,353    
Accumulated depreciation $ (37,918)    
Date of construction 2005    
Date acquired Sep-07    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 108,353    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 37,918    
Unencumbered Apartment Communities | Mill Creek at Windermere | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mill Creek at Windermere | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mio      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 103    
Initial cost      
Land $ 11,012    
Buildings and improvements 39,982    
Costs capitalized subsequent to acquisition 1,286    
Gross amount carried at close of period      
Land and improvements 11,012    
Buildings and improvements 41,268    
Total 52,280    
Accumulated depreciation $ (8,583)    
Date of construction 2015    
Date acquired Jan-16    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 52,280    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,583    
Unencumbered Apartment Communities | Mio | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mio | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mirabella      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 188    
Initial cost      
Land $ 6,180    
Buildings and improvements 26,673    
Costs capitalized subsequent to acquisition 18,074    
Gross amount carried at close of period      
Land and improvements 6,270    
Buildings and improvements 44,657    
Total 50,927    
Accumulated depreciation $ (29,785)    
Date of construction 2000    
Date acquired May-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 50,927    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 29,785    
Unencumbered Apartment Communities | Mirabella | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mirabella | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mira Monte      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 354    
Initial cost      
Land $ 7,165    
Buildings and improvements 28,459    
Costs capitalized subsequent to acquisition 13,643    
Gross amount carried at close of period      
Land and improvements 7,186    
Buildings and improvements 42,081    
Total 49,267    
Accumulated depreciation $ (28,485)    
Date of construction 1982    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 49,267    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 28,485    
Unencumbered Apartment Communities | Mira Monte | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mira Monte | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Miracle Mile/Marbella      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 236    
Initial cost      
Land $ 7,791    
Buildings and improvements 23,075    
Costs capitalized subsequent to acquisition 17,041    
Gross amount carried at close of period      
Land and improvements 7,886    
Buildings and improvements 40,021    
Total 47,907    
Accumulated depreciation $ (30,850)    
Date of construction 1988    
Date acquired Aug-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 47,907    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 30,850    
Unencumbered Apartment Communities | Miracle Mile/Marbella | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Miracle Mile/Marbella | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mission Hills      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 282    
Initial cost      
Land $ 10,099    
Buildings and improvements 38,778    
Costs capitalized subsequent to acquisition 12,891    
Gross amount carried at close of period      
Land and improvements 10,167    
Buildings and improvements 51,601    
Total 61,768    
Accumulated depreciation $ (29,576)    
Date of construction 1984    
Date acquired Jul-05    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 61,768    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 29,576    
Unencumbered Apartment Communities | Mission Hills | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mission Hills | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mission Peaks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 453    
Initial cost      
Land $ 46,499    
Buildings and improvements 108,498    
Costs capitalized subsequent to acquisition 9,841    
Gross amount carried at close of period      
Land and improvements 46,499    
Buildings and improvements 118,339    
Total 164,838    
Accumulated depreciation $ (34,708)    
Date of construction 1995    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 164,838    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 34,708    
Unencumbered Apartment Communities | Mission Peaks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Mission Peaks | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mission Peaks II      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 336    
Initial cost      
Land $ 31,429    
Buildings and improvements 73,334    
Costs capitalized subsequent to acquisition 9,673    
Gross amount carried at close of period      
Land and improvements 31,429    
Buildings and improvements 83,007    
Total 114,436    
Accumulated depreciation $ (24,914)    
Date of construction 1989    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 114,436    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 24,914    
Unencumbered Apartment Communities | Mission Peaks II | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Mission Peaks II | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Montanosa      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 472    
Initial cost      
Land $ 26,697    
Buildings and improvements 106,787    
Costs capitalized subsequent to acquisition 10,525    
Gross amount carried at close of period      
Land and improvements 26,697    
Buildings and improvements 117,312    
Total 144,009    
Accumulated depreciation $ (33,373)    
Date of construction 1990    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 144,009    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 33,373    
Unencumbered Apartment Communities | Montclaire      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 390    
Initial cost      
Land $ 4,842    
Buildings and improvements 19,776    
Costs capitalized subsequent to acquisition 30,760    
Gross amount carried at close of period      
Land and improvements 4,997    
Buildings and improvements 50,381    
Total 55,378    
Accumulated depreciation $ (44,965)    
Date of construction 1973    
Date acquired Dec-88    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 55,378    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 44,965    
Unencumbered Apartment Communities | Montclaire | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Montclaire | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Montebello      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 248    
Initial cost      
Land $ 13,857    
Buildings and improvements 41,575    
Costs capitalized subsequent to acquisition 9,748    
Gross amount carried at close of period      
Land and improvements 13,858    
Buildings and improvements 51,322    
Total 65,180    
Accumulated depreciation $ (18,121)    
Date of construction 1996    
Date acquired Jul-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 65,180    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,121    
Unencumbered Apartment Communities | Montejo Apartments      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 124    
Initial cost      
Land $ 1,925    
Buildings and improvements 7,685    
Costs capitalized subsequent to acquisition 5,002    
Gross amount carried at close of period      
Land and improvements 2,194    
Buildings and improvements 12,418    
Total 14,612    
Accumulated depreciation $ (8,161)    
Date of construction 1974    
Date acquired Nov-01    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 14,612    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,161    
Unencumbered Apartment Communities | Monterey Villas      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 122    
Initial cost      
Land $ 2,349    
Buildings and improvements 5,579    
Costs capitalized subsequent to acquisition 7,515    
Gross amount carried at close of period      
Land and improvements 2,424    
Buildings and improvements 13,019    
Total 15,443    
Accumulated depreciation $ (9,753)    
Date of construction 1974    
Date acquired Jul-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 15,443    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,753    
Unencumbered Apartment Communities | Monterey Villas | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Monterey Villas | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Muse      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 152    
Initial cost      
Land $ 7,822    
Buildings and improvements 33,436    
Costs capitalized subsequent to acquisition 6,129    
Gross amount carried at close of period      
Land and improvements 7,823    
Buildings and improvements 39,564    
Total 47,387    
Accumulated depreciation $ (16,657)    
Date of construction 2011    
Date acquired Feb-11    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 47,387    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,657    
Unencumbered Apartment Communities | Muse | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Muse | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Mylo      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 476    
Initial cost      
Land $ 6,472    
Buildings and improvements 206,098    
Costs capitalized subsequent to acquisition 255    
Gross amount carried at close of period      
Land and improvements 6,472    
Buildings and improvements 206,353    
Total 212,825    
Accumulated depreciation $ (15,746)    
Date of construction 2021    
Date acquired Jun-21    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 212,825    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,746    
Unencumbered Apartment Communities | Mylo | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Mylo | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | 1000 Kiely      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 121    
Initial cost      
Land $ 9,359    
Buildings and improvements 21,845    
Costs capitalized subsequent to acquisition 9,120    
Gross amount carried at close of period      
Land and improvements 9,359    
Buildings and improvements 30,965    
Total 40,324    
Accumulated depreciation $ (15,344)    
Date of construction 1971    
Date acquired Mar-11    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 40,324    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,344    
Unencumbered Apartment Communities | Palm Valley      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 1,100    
Initial cost      
Land $ 133,802    
Buildings and improvements 312,205    
Costs capitalized subsequent to acquisition 22,714    
Gross amount carried at close of period      
Land and improvements 133,802    
Buildings and improvements 334,919    
Total 468,721    
Accumulated depreciation $ (62,857)    
Date of construction 2008    
Date acquired Jan-17    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 468,721    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 62,857    
Unencumbered Apartment Communities | Palm Valley | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Palm Valley | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Paragon Apartments      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 301    
Initial cost      
Land $ 32,230    
Buildings and improvements 77,320    
Costs capitalized subsequent to acquisition 2,998    
Gross amount carried at close of period      
Land and improvements 32,230    
Buildings and improvements 80,318    
Total 112,548    
Accumulated depreciation $ (20,711)    
Date of construction 2013    
Date acquired Jul-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 112,548    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 20,711    
Unencumbered Apartment Communities | Paragon Apartments | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Paragon Apartments | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Park Catalina      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 90    
Initial cost      
Land $ 4,710    
Buildings and improvements 18,839    
Costs capitalized subsequent to acquisition 3,971    
Gross amount carried at close of period      
Land and improvements 4,710    
Buildings and improvements 22,810    
Total 27,520    
Accumulated depreciation $ (8,980)    
Date of construction 2002    
Date acquired Jun-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 27,520    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,980    
Unencumbered Apartment Communities | Park Catalina | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Park Catalina | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Park Highland      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 250    
Initial cost      
Land $ 9,391    
Buildings and improvements 38,224    
Costs capitalized subsequent to acquisition 14,401    
Gross amount carried at close of period      
Land and improvements 9,391    
Buildings and improvements 52,625    
Total 62,016    
Accumulated depreciation $ (19,678)    
Date of construction 1993    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 62,016    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 19,678    
Unencumbered Apartment Communities | Park Highland | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Park Highland | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Park Hill at Issaquah      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 245    
Initial cost      
Land $ 7,284    
Buildings and improvements 21,937    
Costs capitalized subsequent to acquisition 12,573    
Gross amount carried at close of period      
Land and improvements 7,284    
Buildings and improvements 34,510    
Total 41,794    
Accumulated depreciation $ (20,312)    
Date of construction 1999    
Date acquired Feb-99    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 41,794    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 20,312    
Unencumbered Apartment Communities | Park Hill at Issaquah | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Park Hill at Issaquah | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Park Viridian      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 320    
Initial cost      
Land $ 15,894    
Buildings and improvements 63,574    
Costs capitalized subsequent to acquisition 5,414    
Gross amount carried at close of period      
Land and improvements 15,894    
Buildings and improvements 68,988    
Total 84,882    
Accumulated depreciation $ (20,073)    
Date of construction 2008    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 84,882    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 20,073    
Unencumbered Apartment Communities | Park Viridian | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Park Viridian | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Park West      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 126    
Initial cost      
Land $ 9,424    
Buildings and improvements 21,988    
Costs capitalized subsequent to acquisition 13,419    
Gross amount carried at close of period      
Land and improvements 9,424    
Buildings and improvements 35,407    
Total 44,831    
Accumulated depreciation $ (16,014)    
Date of construction 1958    
Date acquired Sep-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 44,831    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,014    
Unencumbered Apartment Communities | Park West | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Park West | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Parkwood at Mill Creek      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 240    
Initial cost      
Land $ 10,680    
Buildings and improvements 42,722    
Costs capitalized subsequent to acquisition 3,840    
Gross amount carried at close of period      
Land and improvements 10,680    
Buildings and improvements 46,562    
Total 57,242    
Accumulated depreciation $ (13,892)    
Date of construction 1989    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 57,242    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,892    
Unencumbered Apartment Communities | Parkwood at Mill Creek | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Parkwood at Mill Creek | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Patent 523      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 295    
Initial cost      
Land $ 14,558    
Buildings and improvements 69,417    
Costs capitalized subsequent to acquisition 6,545    
Gross amount carried at close of period      
Land and improvements 14,558    
Buildings and improvements 75,962    
Total 90,520    
Accumulated depreciation $ (32,488)    
Date of construction 2010    
Date acquired Mar-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 90,520    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 32,488    
Unencumbered Apartment Communities | Patent 523 | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Patent 523 | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pathways at Bixby Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 296    
Initial cost      
Land $ 4,083    
Buildings and improvements 16,757    
Costs capitalized subsequent to acquisition 22,439    
Gross amount carried at close of period      
Land and improvements 6,239    
Buildings and improvements 37,040    
Total 43,279    
Accumulated depreciation $ (33,954)    
Date of construction 1975    
Date acquired Feb-91    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 43,279    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 33,954    
Unencumbered Apartment Communities | Pathways at Bixby Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Pathways at Bixby Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Piedmont      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 396    
Initial cost      
Land $ 19,848    
Buildings and improvements 59,606    
Costs capitalized subsequent to acquisition 15,648    
Gross amount carried at close of period      
Land and improvements 19,848    
Buildings and improvements 75,254    
Total 95,102    
Accumulated depreciation $ (24,127)    
Date of construction 1969    
Date acquired May-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 95,102    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 24,127    
Unencumbered Apartment Communities | Piedmont | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Piedmont | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pinehurst      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 28    
Initial cost      
Land $ 0    
Buildings and improvements 1,711    
Costs capitalized subsequent to acquisition 793    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 2,504    
Total 2,504    
Accumulated depreciation $ (1,772)    
Date of construction 1973    
Date acquired Dec-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 2,504    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 1,772    
Unencumbered Apartment Communities | Pinehurst | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Pinehurst | Maximum      
Gross amount carried at close of period      
Life used for depreciation 24 years    
Unencumbered Apartment Communities | Pinnacle at Fullerton      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 192    
Initial cost      
Land $ 11,019    
Buildings and improvements 45,932    
Costs capitalized subsequent to acquisition 5,679    
Gross amount carried at close of period      
Land and improvements 11,019    
Buildings and improvements 51,611    
Total 62,630    
Accumulated depreciation $ (15,335)    
Date of construction 2004    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 62,630    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,335    
Unencumbered Apartment Communities | Pinnacle at Fullerton | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Pinnacle at Fullerton | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pinnacle on Lake Washington      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 180    
Initial cost      
Land $ 7,760    
Buildings and improvements 31,041    
Costs capitalized subsequent to acquisition 4,519    
Gross amount carried at close of period      
Land and improvements 7,760    
Buildings and improvements 35,560    
Total 43,320    
Accumulated depreciation $ (10,763)    
Date of construction 2001    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 43,320    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,763    
Unencumbered Apartment Communities | Pinnacle on Lake Washington | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Pinnacle on Lake Washington | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pinnacle at MacArthur Place      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 253    
Initial cost      
Land $ 15,810    
Buildings and improvements 66,401    
Costs capitalized subsequent to acquisition 7,228    
Gross amount carried at close of period      
Land and improvements 15,810    
Buildings and improvements 73,629    
Total 89,439    
Accumulated depreciation $ (21,501)    
Date of construction 2002    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 89,439    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,501    
Unencumbered Apartment Communities | Pinnacle at MacArthur Place | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Pinnacle at MacArthur Place | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pinnacle at Otay Ranch I & II      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 364    
Initial cost      
Land $ 17,023    
Buildings and improvements 68,093    
Costs capitalized subsequent to acquisition 6,313    
Gross amount carried at close of period      
Land and improvements 17,023    
Buildings and improvements 74,406    
Total 91,429    
Accumulated depreciation $ (21,532)    
Date of construction 2001    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 91,429    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,532    
Unencumbered Apartment Communities | Pinnacle at Otay Ranch I & II | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Pinnacle at Otay Ranch I & II | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pinnacle at Talega      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 362    
Initial cost      
Land $ 19,292    
Buildings and improvements 77,168    
Costs capitalized subsequent to acquisition 4,788    
Gross amount carried at close of period      
Land and improvements 19,292    
Buildings and improvements 81,956    
Total 101,248    
Accumulated depreciation $ (23,314)    
Date of construction 2002    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 101,248    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 23,314    
Unencumbered Apartment Communities | Pinnacle at Talega | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Pinnacle at Talega | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pinnacle Sonata      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 268    
Initial cost      
Land $ 14,647    
Buildings and improvements 58,586    
Costs capitalized subsequent to acquisition 7,482    
Gross amount carried at close of period      
Land and improvements 14,647    
Buildings and improvements 66,068    
Total 80,715    
Accumulated depreciation $ (18,985)    
Date of construction 2000    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 80,715    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,985    
Unencumbered Apartment Communities | Pinnacle Sonata | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Pinnacle Sonata | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pointe at Cupertino      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 116    
Initial cost      
Land $ 4,505    
Buildings and improvements 17,605    
Costs capitalized subsequent to acquisition 13,270    
Gross amount carried at close of period      
Land and improvements 4,505    
Buildings and improvements 30,875    
Total 35,380    
Accumulated depreciation $ (22,156)    
Date of construction 1963    
Date acquired Aug-98    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 35,380    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 22,156    
Unencumbered Apartment Communities | Pointe at Cupertino | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Pointe at Cupertino | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Pure Redmond      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 105    
Initial cost      
Land $ 7,461    
Buildings and improvements 31,363    
Costs capitalized subsequent to acquisition 802    
Gross amount carried at close of period      
Land and improvements 7,461    
Buildings and improvements 32,165    
Total 39,626    
Accumulated depreciation $ (2,388)    
Date of construction 2016    
Date acquired Dec-19    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 39,626    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 2,388    
Unencumbered Apartment Communities | Pure Redmond | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Pure Redmond | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Radius      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 264    
Initial cost      
Land $ 11,702    
Buildings and improvements 152,336    
Costs capitalized subsequent to acquisition 2,532    
Gross amount carried at close of period      
Land and improvements 11,702    
Buildings and improvements 154,868    
Total 166,570    
Accumulated depreciation $ (44,224)    
Date of construction 2015    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 166,570    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 44,224    
Unencumbered Apartment Communities | Radius | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Radius | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Reed Square      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 100    
Initial cost      
Land $ 6,873    
Buildings and improvements 16,037    
Costs capitalized subsequent to acquisition 8,867    
Gross amount carried at close of period      
Land and improvements 6,873    
Buildings and improvements 24,904    
Total 31,777    
Accumulated depreciation $ (12,639)    
Date of construction 1970    
Date acquired Jan-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 31,777    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,639    
Unencumbered Apartment Communities | Reed Square | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Reed Square | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Regency at Encino      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 75    
Initial cost      
Land $ 3,184    
Buildings and improvements 12,737    
Costs capitalized subsequent to acquisition 4,453    
Gross amount carried at close of period      
Land and improvements 3,184    
Buildings and improvements 17,190    
Total 20,374    
Accumulated depreciation $ (8,439)    
Date of construction 1989    
Date acquired Dec-09    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 20,374    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,439    
Unencumbered Apartment Communities | Regency at Encino | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Regency at Encino | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Renaissance at Uptown Orange      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 460    
Initial cost      
Land $ 27,870    
Buildings and improvements 111,482    
Costs capitalized subsequent to acquisition 8,293    
Gross amount carried at close of period      
Land and improvements 27,870    
Buildings and improvements 119,775    
Total 147,645    
Accumulated depreciation $ (34,600)    
Date of construction 2007    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 147,645    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 34,600    
Unencumbered Apartment Communities | Renaissance at Uptown Orange | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Renaissance at Uptown Orange | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Reveal      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 438    
Initial cost      
Land $ 25,073    
Buildings and improvements 121,314    
Costs capitalized subsequent to acquisition 4,512    
Gross amount carried at close of period      
Land and improvements 25,073    
Buildings and improvements 125,826    
Total 150,899    
Accumulated depreciation $ (32,292)    
Date of construction 2010    
Date acquired Apr-15    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 150,899    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 32,292    
Unencumbered Apartment Communities | Reveal | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Reveal | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Salmon Run at Perry Creek      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 132    
Initial cost      
Land $ 3,717    
Buildings and improvements 11,483    
Costs capitalized subsequent to acquisition 3,175    
Gross amount carried at close of period      
Land and improvements 3,801    
Buildings and improvements 14,574    
Total 18,375    
Accumulated depreciation $ (10,175)    
Date of construction 2000    
Date acquired Oct-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 18,375    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,175    
Unencumbered Apartment Communities | Salmon Run at Perry Creek | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Salmon Run at Perry Creek | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Sammamish View      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 153    
Initial cost      
Land $ 3,324    
Buildings and improvements 7,501    
Costs capitalized subsequent to acquisition 7,819    
Gross amount carried at close of period      
Land and improvements 3,331    
Buildings and improvements 15,313    
Total 18,644    
Accumulated depreciation $ (13,561)    
Date of construction 1986    
Date acquired Nov-94    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 18,644    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,561    
Unencumbered Apartment Communities | Sammamish View | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Sammamish View | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | 101 San Fernando      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 323    
Initial cost      
Land $ 4,173    
Buildings and improvements 58,961    
Costs capitalized subsequent to acquisition 15,936    
Gross amount carried at close of period      
Land and improvements 4,173    
Buildings and improvements 74,897    
Total 79,070    
Accumulated depreciation $ (33,391)    
Date of construction 2001    
Date acquired Jul-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 79,070    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 33,391    
Unencumbered Apartment Communities | 101 San Fernando | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | 101 San Fernando | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | San Marcos      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 432    
Initial cost      
Land $ 15,563    
Buildings and improvements 36,204    
Costs capitalized subsequent to acquisition 35,460    
Gross amount carried at close of period      
Land and improvements 22,866    
Buildings and improvements 64,361    
Total 87,227    
Accumulated depreciation $ (39,572)    
Date of construction 2003    
Date acquired Nov-03    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 87,227    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 39,572    
Unencumbered Apartment Communities | San Marcos | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | San Marcos | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Santee Court/Santee Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 238    
Initial cost      
Land $ 9,581    
Buildings and improvements 40,317    
Costs capitalized subsequent to acquisition 15,514    
Gross amount carried at close of period      
Land and improvements 9,582    
Buildings and improvements 55,830    
Total 65,412    
Accumulated depreciation $ (22,674)    
Date of construction 2004    
Date acquired Oct-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 65,412    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 22,674    
Unencumbered Apartment Communities | Santee Court/Santee Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Santee Court/Santee Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Shadow Point      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 172    
Initial cost      
Land $ 2,812    
Buildings and improvements 11,170    
Costs capitalized subsequent to acquisition 5,400    
Gross amount carried at close of period      
Land and improvements 2,820    
Buildings and improvements 16,562    
Total 19,382    
Accumulated depreciation $ (10,422)    
Date of construction 1983    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 19,382    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,422    
Unencumbered Apartment Communities | Shadow Point | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Shadow Point | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Shadowbrook      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 418    
Initial cost      
Land $ 19,292    
Buildings and improvements 77,168    
Costs capitalized subsequent to acquisition 6,721    
Gross amount carried at close of period      
Land and improvements 19,292    
Buildings and improvements 83,889    
Total 103,181    
Accumulated depreciation $ (24,714)    
Date of construction 1986    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 103,181    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 24,714    
Unencumbered Apartment Communities | Shadowbrook | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Shadowbrook | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Slater 116      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 108    
Initial cost      
Land $ 7,379    
Buildings and improvements 22,138    
Costs capitalized subsequent to acquisition 1,632    
Gross amount carried at close of period      
Land and improvements 7,379    
Buildings and improvements 23,770    
Total 31,149    
Accumulated depreciation $ (6,962)    
Date of construction 2013    
Date acquired Sep-13    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 31,149    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 6,962    
Unencumbered Apartment Communities | Slater 116 | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Slater 116 | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Solstice      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 280    
Initial cost      
Land $ 34,444    
Buildings and improvements 147,262    
Costs capitalized subsequent to acquisition 7,311    
Gross amount carried at close of period      
Land and improvements 34,444    
Buildings and improvements 154,573    
Total 189,017    
Accumulated depreciation $ (47,229)    
Date of construction 2014    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 189,017    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 47,229    
Unencumbered Apartment Communities | Solstice | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Solstice | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Station Park Green - Phases I, II, and III      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 492    
Initial cost      
Land $ 54,782    
Buildings and improvements 314,694    
Costs capitalized subsequent to acquisition 11,710    
Gross amount carried at close of period      
Land and improvements 54,782    
Buildings and improvements 326,404    
Total 381,186    
Accumulated depreciation $ (38,705)    
Date of construction 2018    
Date acquired Mar-18    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 381,186    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 38,705    
Unencumbered Apartment Communities | Station Park Green - Phases I, II, and III | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Station Park Green - Phases I, II, and III | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Stevenson Place      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 200    
Initial cost      
Land $ 996    
Buildings and improvements 5,582    
Costs capitalized subsequent to acquisition 14,597    
Gross amount carried at close of period      
Land and improvements 1,001    
Buildings and improvements 20,174    
Total 21,175    
Accumulated depreciation $ (16,780)    
Date of construction 1975    
Date acquired Apr-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 21,175    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,780    
Unencumbered Apartment Communities | Stevenson Place | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Stevenson Place | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Stonehedge Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 196    
Initial cost      
Land $ 3,167    
Buildings and improvements 12,603    
Costs capitalized subsequent to acquisition 10,006    
Gross amount carried at close of period      
Land and improvements 3,201    
Buildings and improvements 22,575    
Total 25,776    
Accumulated depreciation $ (17,191)    
Date of construction 1986    
Date acquired Oct-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 25,776    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 17,191    
Unencumbered Apartment Communities | Stonehedge Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Stonehedge Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Summerhill Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 100    
Initial cost      
Land $ 2,654    
Buildings and improvements 4,918    
Costs capitalized subsequent to acquisition 11,319    
Gross amount carried at close of period      
Land and improvements 2,656    
Buildings and improvements 16,235    
Total 18,891    
Accumulated depreciation $ (13,756)    
Date of construction 1988    
Date acquired Sep-88    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 18,891    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,756    
Unencumbered Apartment Communities | Summerhill Park | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Summerhill Park | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Summit Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 300    
Initial cost      
Land $ 5,959    
Buildings and improvements 23,670    
Costs capitalized subsequent to acquisition 9,528    
Gross amount carried at close of period      
Land and improvements 5,977    
Buildings and improvements 33,180    
Total 39,157    
Accumulated depreciation $ (21,395)    
Date of construction 1972    
Date acquired Dec-02    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 39,157    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,395    
Unencumbered Apartment Communities | Summit Park | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Summit Park | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Taylor 28      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 197    
Initial cost      
Land $ 13,915    
Buildings and improvements 57,700    
Costs capitalized subsequent to acquisition 4,287    
Gross amount carried at close of period      
Land and improvements 13,915    
Buildings and improvements 61,987    
Total 75,902    
Accumulated depreciation $ (17,851)    
Date of construction 2008    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 75,902    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 17,851    
Unencumbered Apartment Communities | Taylor 28 | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Taylor 28 | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Audrey at Belltown      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 137    
Initial cost      
Land $ 9,228    
Buildings and improvements 36,911    
Costs capitalized subsequent to acquisition 2,517    
Gross amount carried at close of period      
Land and improvements 9,228    
Buildings and improvements 39,428    
Total 48,656    
Accumulated depreciation $ (10,962)    
Date of construction 1992    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 48,656    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 10,962    
Unencumbered Apartment Communities | The Audrey at Belltown | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | The Audrey at Belltown | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Avery      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 121    
Initial cost      
Land $ 6,964    
Buildings and improvements 29,922    
Costs capitalized subsequent to acquisition 1,114    
Gross amount carried at close of period      
Land and improvements 6,964    
Buildings and improvements 31,036    
Total 38,000    
Accumulated depreciation $ (8,214)    
Date of construction 2014    
Date acquired Mar-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 38,000    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,214    
Unencumbered Apartment Communities | The Avery | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Avery | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Bernard      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 63    
Initial cost      
Land $ 3,699    
Buildings and improvements 11,345    
Costs capitalized subsequent to acquisition 954    
Gross amount carried at close of period      
Land and improvements 3,689    
Buildings and improvements 12,309    
Total 15,998    
Accumulated depreciation $ (4,577)    
Date of construction 2008    
Date acquired Sep-11    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 15,998    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 4,577    
Unencumbered Apartment Communities | The Bernard | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Bernard | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Blake LA      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 196    
Initial cost      
Land $ 4,023    
Buildings and improvements 9,527    
Costs capitalized subsequent to acquisition 25,098    
Gross amount carried at close of period      
Land and improvements 4,031    
Buildings and improvements 34,617    
Total 38,648    
Accumulated depreciation $ (23,033)    
Date of construction 1979    
Date acquired Jun-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 38,648    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 23,033    
Unencumbered Apartment Communities | The Blake LA | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Blake LA | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Cairns      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 99    
Initial cost      
Land $ 6,937    
Buildings and improvements 20,679    
Costs capitalized subsequent to acquisition 2,683    
Gross amount carried at close of period      
Land and improvements 6,939    
Buildings and improvements 23,360    
Total 30,299    
Accumulated depreciation $ (11,846)    
Date of construction 2006    
Date acquired Jun-07    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 30,299    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 11,846    
Unencumbered Apartment Communities | The Cairns | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Cairns | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Commons      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 264    
Initial cost      
Land $ 12,555    
Buildings and improvements 29,307    
Costs capitalized subsequent to acquisition 10,799    
Gross amount carried at close of period      
Land and improvements 12,556    
Buildings and improvements 40,105    
Total 52,661    
Accumulated depreciation $ (18,984)    
Date of construction 1973    
Date acquired Jul-10    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 52,661    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,984    
Unencumbered Apartment Communities | The Commons | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Commons | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Elliot at Mukilteo      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 301    
Initial cost      
Land $ 2,498    
Buildings and improvements 10,595    
Costs capitalized subsequent to acquisition 19,215    
Gross amount carried at close of period      
Land and improvements 2,824    
Buildings and improvements 29,484    
Total 32,308    
Accumulated depreciation $ (24,239)    
Date of construction 1981    
Date acquired Jan-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 32,308    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 24,239    
Unencumbered Apartment Communities | The Elliot at Mukilteo | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Elliot at Mukilteo | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Galloway      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 506    
Initial cost      
Land $ 32,966    
Buildings and improvements 184,499    
Costs capitalized subsequent to acquisition 3,632    
Gross amount carried at close of period      
Land and improvements 32,966    
Buildings and improvements 188,131    
Total 221,097    
Accumulated depreciation $ (12,985)    
Date of construction 2016    
Date acquired Jan-20    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 221,097    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,985    
Unencumbered Apartment Communities | The Galloway | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Galloway | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Grand      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 243    
Initial cost      
Land $ 4,531    
Buildings and improvements 89,208    
Costs capitalized subsequent to acquisition 8,096    
Gross amount carried at close of period      
Land and improvements 4,531    
Buildings and improvements 97,304    
Total 101,835    
Accumulated depreciation $ (44,341)    
Date of construction 2009    
Date acquired Jan-09    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 101,835    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 44,341    
Unencumbered Apartment Communities | The Grand | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Grand | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Hallie      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 292    
Initial cost      
Land $ 2,202    
Buildings and improvements 4,794    
Costs capitalized subsequent to acquisition 55,901    
Gross amount carried at close of period      
Land and improvements 8,385    
Buildings and improvements 54,512    
Total 62,897    
Accumulated depreciation $ (42,729)    
Date of construction 1972    
Date acquired Apr-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 62,897    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 42,729    
Unencumbered Apartment Communities | The Hallie | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Hallie | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Huntington      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 276    
Initial cost      
Land $ 10,374    
Buildings and improvements 41,495    
Costs capitalized subsequent to acquisition 7,703    
Gross amount carried at close of period      
Land and improvements 10,374    
Buildings and improvements 49,198    
Total 59,572    
Accumulated depreciation $ (17,940)    
Date of construction 1975    
Date acquired Jun-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 59,572    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 17,940    
Unencumbered Apartment Communities | The Huntington | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Huntington | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Landing at Jack London Square      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 282    
Initial cost      
Land $ 33,554    
Buildings and improvements 78,292    
Costs capitalized subsequent to acquisition 8,633    
Gross amount carried at close of period      
Land and improvements 33,554    
Buildings and improvements 86,925    
Total 120,479    
Accumulated depreciation $ (26,682)    
Date of construction 2001    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 120,479    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 26,682    
Unencumbered Apartment Communities | The Landing at Jack London Square | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | The Landing at Jack London Square | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Lofts at Pinehurst      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 118    
Initial cost      
Land $ 1,570    
Buildings and improvements 3,912    
Costs capitalized subsequent to acquisition 5,833    
Gross amount carried at close of period      
Land and improvements 1,618    
Buildings and improvements 9,697    
Total 11,315    
Accumulated depreciation $ (7,072)    
Date of construction 1971    
Date acquired Jun-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 11,315    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 7,072    
Unencumbered Apartment Communities | The Lofts at Pinehurst | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Lofts at Pinehurst | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Palisades      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 192    
Initial cost      
Land $ 1,560    
Buildings and improvements 6,242    
Costs capitalized subsequent to acquisition 14,942    
Gross amount carried at close of period      
Land and improvements 1,565    
Buildings and improvements 21,179    
Total 22,744    
Accumulated depreciation $ (18,824)    
Date of construction 1977    
Date acquired May-90    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 22,744    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,824    
Unencumbered Apartment Communities | The Palisades | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Palisades | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Palms at Laguna Niguel      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 460    
Initial cost      
Land $ 23,584    
Buildings and improvements 94,334    
Costs capitalized subsequent to acquisition 13,829    
Gross amount carried at close of period      
Land and improvements 23,584    
Buildings and improvements 108,163    
Total 131,747    
Accumulated depreciation $ (32,672)    
Date of construction 1988    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 131,747    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 32,672    
Unencumbered Apartment Communities | The Palms at Laguna Niguel | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | The Palms at Laguna Niguel | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Stuart      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 188    
Initial cost      
Land $ 13,574    
Buildings and improvements 54,298    
Costs capitalized subsequent to acquisition 3,987    
Gross amount carried at close of period      
Land and improvements 13,574    
Buildings and improvements 58,285    
Total 71,859    
Accumulated depreciation $ (16,886)    
Date of construction 2007    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 71,859    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,886    
Unencumbered Apartment Communities | The Stuart | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | The Stuart | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Trails of Redmond      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 423    
Initial cost      
Land $ 21,930    
Buildings and improvements 87,720    
Costs capitalized subsequent to acquisition 7,991    
Gross amount carried at close of period      
Land and improvements 21,930    
Buildings and improvements 95,711    
Total 117,641    
Accumulated depreciation $ (27,650)    
Date of construction 1985    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 117,641    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 27,650    
Unencumbered Apartment Communities | The Trails of Redmond | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | The Trails of Redmond | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Village at Toluca Lake      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 145    
Initial cost      
Land $ 14,634    
Buildings and improvements 48,297    
Costs capitalized subsequent to acquisition 1,028    
Gross amount carried at close of period      
Land and improvements 14,634    
Buildings and improvements 49,325    
Total 63,959    
Accumulated depreciation $ (946)    
Date of construction 1974    
Date acquired Nov-17    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 63,959    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 946    
Unencumbered Apartment Communities | The Village at Toluca Lake | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Village at Toluca Lake | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | The Waterford      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 238    
Initial cost      
Land $ 11,808    
Buildings and improvements 24,500    
Costs capitalized subsequent to acquisition 18,305    
Gross amount carried at close of period      
Land and improvements 15,165    
Buildings and improvements 39,448    
Total 54,613    
Accumulated depreciation $ (27,513)    
Date of construction 2000    
Date acquired Jun-00    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 54,613    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 27,513    
Unencumbered Apartment Communities | The Waterford | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | The Waterford | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Tierra Vista      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 404    
Initial cost      
Land $ 13,652    
Buildings and improvements 53,336    
Costs capitalized subsequent to acquisition 8,926    
Gross amount carried at close of period      
Land and improvements 13,661    
Buildings and improvements 62,253    
Total 75,914    
Accumulated depreciation $ (36,922)    
Date of construction 2001    
Date acquired Jan-01    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 75,914    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 36,922    
Unencumbered Apartment Communities | Tierra Vista | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Tierra Vista | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Tiffany Court      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 101    
Initial cost      
Land $ 6,949    
Buildings and improvements 27,796    
Costs capitalized subsequent to acquisition 2,628    
Gross amount carried at close of period      
Land and improvements 6,949    
Buildings and improvements 30,424    
Total 37,373    
Accumulated depreciation $ (8,740)    
Date of construction 1987    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 37,373    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,740    
Unencumbered Apartment Communities | Tiffany Court | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Tiffany Court | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Trabuco Villas      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 132    
Initial cost      
Land $ 3,638    
Buildings and improvements 8,640    
Costs capitalized subsequent to acquisition 4,792    
Gross amount carried at close of period      
Land and improvements 3,890    
Buildings and improvements 13,180    
Total 17,070    
Accumulated depreciation $ (9,981)    
Date of construction 1985    
Date acquired Oct-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 17,070    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 9,981    
Unencumbered Apartment Communities | Trabuco Villas | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Trabuco Villas | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Valley Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 160    
Initial cost      
Land $ 3,361    
Buildings and improvements 13,420    
Costs capitalized subsequent to acquisition 6,898    
Gross amount carried at close of period      
Land and improvements 3,761    
Buildings and improvements 19,918    
Total 23,679    
Accumulated depreciation $ (13,354)    
Date of construction 1969    
Date acquired Nov-01    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 23,679    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 13,354    
Unencumbered Apartment Communities | Via      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 284    
Initial cost      
Land $ 22,000    
Buildings and improvements 82,270    
Costs capitalized subsequent to acquisition 5,344    
Gross amount carried at close of period      
Land and improvements 22,016    
Buildings and improvements 87,598    
Total 109,614    
Accumulated depreciation $ (33,896)    
Date of construction 2011    
Date acquired Jul-11    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 109,614    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 33,896    
Unencumbered Apartment Communities | Via | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Via | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Villa Angelina      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 256    
Initial cost      
Land $ 4,498    
Buildings and improvements 17,962    
Costs capitalized subsequent to acquisition 9,009    
Gross amount carried at close of period      
Land and improvements 4,962    
Buildings and improvements 26,507    
Total 31,469    
Accumulated depreciation $ (18,042)    
Date of construction 1970    
Date acquired Nov-01    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 31,469    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 18,042    
Unencumbered Apartment Communities | Villa Granada      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 270    
Initial cost      
Land $ 38,299    
Buildings and improvements 89,365    
Costs capitalized subsequent to acquisition 2,095    
Gross amount carried at close of period      
Land and improvements 38,299    
Buildings and improvements 91,460    
Total 129,759    
Accumulated depreciation $ (26,047)    
Date of construction 2010    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 129,759    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 26,047    
Unencumbered Apartment Communities | Villa Granada | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Villa Granada | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Villa Siena      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 272    
Initial cost      
Land $ 13,842    
Buildings and improvements 55,367    
Costs capitalized subsequent to acquisition 10,134    
Gross amount carried at close of period      
Land and improvements 13,842    
Buildings and improvements 65,501    
Total 79,343    
Accumulated depreciation $ (21,056)    
Date of construction 1974    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 79,343    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 21,056    
Unencumbered Apartment Communities | Villa Siena | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Villa Siena | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Village Green      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 272    
Initial cost      
Land $ 6,488    
Buildings and improvements 36,768    
Costs capitalized subsequent to acquisition 4,839    
Gross amount carried at close of period      
Land and improvements 6,488    
Buildings and improvements 41,607    
Total 48,095    
Accumulated depreciation $ (12,868)    
Date of construction 1971    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 48,095    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 12,868    
Unencumbered Apartment Communities | Village Green | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Village Green | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Vista Belvedere      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 76    
Initial cost      
Land $ 5,573    
Buildings and improvements 11,901    
Costs capitalized subsequent to acquisition 9,240    
Gross amount carried at close of period      
Land and improvements 5,573    
Buildings and improvements 21,141    
Total 26,714    
Accumulated depreciation $ (14,041)    
Date of construction 1963    
Date acquired Aug-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 26,714    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,041    
Unencumbered Apartment Communities | Vista Belvedere | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Vista Belvedere | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Vox Apartments      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 58    
Initial cost      
Land $ 5,545    
Buildings and improvements 16,635    
Costs capitalized subsequent to acquisition 458    
Gross amount carried at close of period      
Land and improvements 5,545    
Buildings and improvements 17,093    
Total 22,638    
Accumulated depreciation $ (4,776)    
Date of construction 2013    
Date acquired Oct-13    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 22,638    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 4,776    
Unencumbered Apartment Communities | Vox Apartments | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Vox Apartments | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Wallace on Sunset      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 200    
Initial cost      
Land $ 24,005    
Buildings and improvements 80,466    
Costs capitalized subsequent to acquisition 1,388    
Gross amount carried at close of period      
Land and improvements 24,005    
Buildings and improvements 81,854    
Total 105,859    
Accumulated depreciation $ (7,718)    
Date of construction 2021    
Date acquired Dec-21    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 105,859    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 7,718    
Unencumbered Apartment Communities | Wallace on Sunset | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Wallace on Sunset | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Walnut Heights      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 163    
Initial cost      
Land $ 4,858    
Buildings and improvements 19,168    
Costs capitalized subsequent to acquisition 6,113    
Gross amount carried at close of period      
Land and improvements 4,887    
Buildings and improvements 25,252    
Total 30,139    
Accumulated depreciation $ (15,929)    
Date of construction 1964    
Date acquired Oct-03    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 30,139    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 15,929    
Unencumbered Apartment Communities | Walnut Heights | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Walnut Heights | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Wandering Creek      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 156    
Initial cost      
Land $ 1,285    
Buildings and improvements 4,980    
Costs capitalized subsequent to acquisition 5,580    
Gross amount carried at close of period      
Land and improvements 1,296    
Buildings and improvements 10,549    
Total 11,845    
Accumulated depreciation $ (8,845)    
Date of construction 1986    
Date acquired Nov-95    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 11,845    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 8,845    
Unencumbered Apartment Communities | Wandering Creek | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Wandering Creek | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Wharfside Pointe      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 155    
Initial cost      
Land $ 2,245    
Buildings and improvements 7,020    
Costs capitalized subsequent to acquisition 13,713    
Gross amount carried at close of period      
Land and improvements 2,258    
Buildings and improvements 20,720    
Total 22,978    
Accumulated depreciation $ (16,922)    
Date of construction 1990    
Date acquired Jun-94    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 22,978    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,922    
Unencumbered Apartment Communities | Wharfside Pointe | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Wharfside Pointe | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Willow Lake      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 508    
Initial cost      
Land $ 43,194    
Buildings and improvements 101,030    
Costs capitalized subsequent to acquisition 17,866    
Gross amount carried at close of period      
Land and improvements 43,194    
Buildings and improvements 118,896    
Total 162,090    
Accumulated depreciation $ (43,068)    
Date of construction 1989    
Date acquired Oct-12    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 162,090    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 43,068    
Unencumbered Apartment Communities | Willow Lake | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Willow Lake | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | 5600 Wilshire      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 284    
Initial cost      
Land $ 30,535    
Buildings and improvements 91,604    
Costs capitalized subsequent to acquisition 6,477    
Gross amount carried at close of period      
Land and improvements 30,535    
Buildings and improvements 98,081    
Total 128,616    
Accumulated depreciation $ (27,411)    
Date of construction 2008    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 128,616    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 27,411    
Unencumbered Apartment Communities | 5600 Wilshire | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | 5600 Wilshire | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Wilshire La Brea      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 478    
Initial cost      
Land $ 56,932    
Buildings and improvements 211,998    
Costs capitalized subsequent to acquisition 14,717    
Gross amount carried at close of period      
Land and improvements 56,932    
Buildings and improvements 226,715    
Total 283,647    
Accumulated depreciation $ (67,716)    
Date of construction 2014    
Date acquired Apr-14    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 283,647    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 67,716    
Unencumbered Apartment Communities | Wilshire La Brea | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Unencumbered Apartment Communities | Wilshire La Brea | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Wilshire Promenade      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 149    
Initial cost      
Land $ 3,118    
Buildings and improvements 7,385    
Costs capitalized subsequent to acquisition 13,435    
Gross amount carried at close of period      
Land and improvements 3,797    
Buildings and improvements 20,141    
Total 23,938    
Accumulated depreciation $ (14,239)    
Date of construction 1992    
Date acquired Jan-97    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 23,938    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 14,239    
Unencumbered Apartment Communities | Wilshire Promenade | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Wilshire Promenade | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Windsor Ridge      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 216    
Initial cost      
Land $ 4,017    
Buildings and improvements 10,315    
Costs capitalized subsequent to acquisition 17,174    
Gross amount carried at close of period      
Land and improvements 4,021    
Buildings and improvements 27,485    
Total 31,506    
Accumulated depreciation $ (25,104)    
Date of construction 1989    
Date acquired Mar-89    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 31,506    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 25,104    
Unencumbered Apartment Communities | Windsor Ridge | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Windsor Ridge | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Woodland Commons      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 302    
Initial cost      
Land $ 2,040    
Buildings and improvements 8,727    
Costs capitalized subsequent to acquisition 25,794    
Gross amount carried at close of period      
Land and improvements 2,044    
Buildings and improvements 34,517    
Total 36,561    
Accumulated depreciation $ (25,895)    
Date of construction 1978    
Date acquired Mar-90    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 36,561    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 25,895    
Unencumbered Apartment Communities | Woodland Commons | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Woodland Commons | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Unencumbered Apartment Communities | Woodside Village      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 145    
Initial cost      
Land $ 5,331    
Buildings and improvements 21,036    
Costs capitalized subsequent to acquisition 6,295    
Gross amount carried at close of period      
Land and improvements 5,341    
Buildings and improvements 27,321    
Total 32,662    
Accumulated depreciation $ (16,023)    
Date of construction 1987    
Date acquired Dec-04    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year $ 32,662    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year $ 16,023    
Unencumbered Apartment Communities | Woodside Village | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Woodside Village | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Other Property      
Initial cost      
Land $ 80,706    
Buildings and improvements 16,587    
Costs capitalized subsequent to acquisition 16,122    
Gross amount carried at close of period      
Land and improvements 82,067    
Buildings and improvements 31,348    
Total 113,415    
Accumulated depreciation (17,023)    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year 113,415    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year 17,023    
Other Property | Other real estate assets      
Initial cost      
Land 80,706    
Buildings and improvements 16,587    
Costs capitalized subsequent to acquisition 16,122    
Gross amount carried at close of period      
Land and improvements 82,067    
Buildings and improvements 31,348    
Total 113,415    
Accumulated depreciation (17,023)    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at the end of year 113,415    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at the end of year 17,023    
Real Estate Rental Property      
Gross amount carried at close of period      
Total 15,629,927 15,061,745 14,038,142
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at beginning of year 15,061,745 14,038,142 13,366,101
Balance at the end of year $ 15,629,927 $ 15,061,745 $ 14,038,142