XML 113 R89.htm IDEA: XBRL DOCUMENT v3.24.0.1
SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
apartment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrance $ 887,204    
Initial cost      
Land 2,981,986    
Buildings and improvements 10,387,597    
Costs capitalized subsequent to acquisition 2,765,640    
Gross amount carried at close of period      
Land and improvements 3,036,912    
Buildings and improvements 13,098,311    
Total 16,135,223    
Accumulated depreciation (5,664,931) $ (5,152,133) $ (4,646,854)
Aggregate cost for federal income tax purpose 12,300,000    
Rental properties:      
Acquisition, development, and improvement of real estate 235,423 427,668 707,267
Disposition of real estate and other (66,427) (91,368) (139,085)
Balance at the end of year 16,135,223    
Accumulated depreciation:      
Balance at beginning of year 5,152,133 4,646,854 4,133,959
Depreciation expense 545,702 536,202 528,613
Depreciation expense - Disposals and other (32,904) (30,923) (15,718)
Balance at the end of year $ 5,664,931 5,152,133 4,646,854
Encumbered Apartment Communities      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 4,190    
Encumbrance $ 887,204    
Initial cost      
Land 302,322    
Buildings and improvements 1,092,669    
Costs capitalized subsequent to acquisition 189,237    
Gross amount carried at close of period      
Land and improvements 305,643    
Buildings and improvements 1,278,585    
Total 1,584,228    
Accumulated depreciation (470,260)    
Rental properties:      
Balance at the end of year 1,584,228    
Accumulated depreciation:      
Balance at the end of year $ 470,260    
Encumbered Apartment Communities | Belmont Station      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 275    
Encumbrance $ 29,263    
Initial cost      
Land 8,100    
Buildings and improvements 66,666    
Costs capitalized subsequent to acquisition 10,397    
Gross amount carried at close of period      
Land and improvements 8,267    
Buildings and improvements 76,896    
Total 85,163    
Accumulated depreciation $ (42,204)    
Date of construction 2009    
Date acquired Mar-09    
Rental properties:      
Balance at the end of year $ 85,163    
Accumulated depreciation:      
Balance at the end of year $ 42,204    
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 $ 90,827    
Initial cost      
Land 16,885    
Buildings and improvements 151,741    
Costs capitalized subsequent to acquisition 4,751    
Gross amount carried at close of period      
Land and improvements 16,885    
Buildings and improvements 156,492    
Total 173,377    
Accumulated depreciation $ (26,551)    
Date of construction 2015    
Date acquired Jun-19    
Rental properties:      
Balance at the end of year $ 173,377    
Accumulated depreciation:      
Balance at the end of year $ 26,551    
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 | Fountain Park      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 705    
Encumbrance $ 82,776    
Initial cost      
Land 25,073    
Buildings and improvements 94,980    
Costs capitalized subsequent to acquisition 47,232    
Gross amount carried at close of period      
Land and improvements 25,203    
Buildings and improvements 142,082    
Total 167,285    
Accumulated depreciation $ (97,729)    
Date of construction 2002    
Date acquired Feb-04    
Rental properties:      
Balance at the end of year $ 167,285    
Accumulated depreciation:      
Balance at the end of year $ 97,729    
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 $ 69,451    
Initial cost      
Land 5,419    
Buildings and improvements 18,347    
Costs capitalized subsequent to acquisition 38,782    
Gross amount carried at close of period      
Land and improvements 6,073    
Buildings and improvements 56,475    
Total 62,548    
Accumulated depreciation $ (47,254)    
Date of construction 1972    
Date acquired May-97    
Rental properties:      
Balance at the end of year $ 62,548    
Accumulated depreciation:      
Balance at the end of year $ 47,254    
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 | Lawrence Station      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 336    
Encumbrance $ 76,848    
Initial cost      
Land 45,532    
Buildings and improvements 106,735    
Costs capitalized subsequent to acquisition 7,740    
Gross amount carried at close of period      
Land and improvements 45,532    
Buildings and improvements 114,475    
Total 160,007    
Accumulated depreciation $ (42,735)    
Date of construction 2012    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 160,007    
Accumulated depreciation:      
Balance at the end of year $ 42,735    
Encumbered Apartment Communities | Lawrence Station | Minimum      
Gross amount carried at close of period      
Life used for depreciation 5 years    
Encumbered Apartment Communities | Lawrence Station | 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 $ 52,400    
Initial cost      
Land 8,190    
Buildings and improvements 24,736    
Costs capitalized subsequent to acquisition 19,633    
Gross amount carried at close of period      
Land and improvements 8,191    
Buildings and improvements 44,368    
Total 52,559    
Accumulated depreciation $ (31,367)    
Date of construction 1963    
Date acquired Sep-07    
Rental properties:      
Balance at the end of year $ 52,559    
Accumulated depreciation:      
Balance at the end of year $ 31,367    
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 $ 44,991    
Initial cost      
Land 20,495    
Buildings and improvements 47,823    
Costs capitalized subsequent to acquisition 1,919    
Gross amount carried at close of period      
Land and improvements 20,495    
Buildings and improvements 49,742    
Total 70,237    
Accumulated depreciation $ (8,532)    
Date of construction 2015    
Date acquired Dec-18    
Rental properties:      
Balance at the end of year $ 70,237    
Accumulated depreciation:      
Balance at the end of year $ 8,532    
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 | Paragon Apartments      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 301    
Encumbrance $ 59,169    
Initial cost      
Land 32,230    
Buildings and improvements 77,320    
Costs capitalized subsequent to acquisition 4,595    
Gross amount carried at close of period      
Land and improvements 32,230    
Buildings and improvements 81,915    
Total 114,145    
Accumulated depreciation $ (26,880)    
Date of construction 2013    
Date acquired Jul-14    
Rental properties:      
Balance at the end of year $ 114,145    
Accumulated depreciation:      
Balance at the end of year $ 26,880    
Encumbered Apartment Communities | Paragon Apartments | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | Paragon Apartments | 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 $ 51,855    
Initial cost      
Land 35,719    
Buildings and improvements 53,449    
Costs capitalized subsequent to acquisition 14,039    
Gross amount carried at close of period      
Land and improvements 35,719    
Buildings and improvements 67,488    
Total 103,207    
Accumulated depreciation $ (20,213)    
Date of construction 1971    
Date acquired Mar-17    
Rental properties:      
Balance at the end of year $ 103,207    
Accumulated depreciation:      
Balance at the end of year $ 20,213    
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 $ 14,925    
Initial cost      
Land 0    
Buildings and improvements 8,520    
Costs capitalized subsequent to acquisition 9,277    
Gross amount carried at close of period      
Land and improvements 2,353    
Buildings and improvements 15,444    
Total 17,797    
Accumulated depreciation $ (12,780)    
Date of construction 1984    
Date acquired Apr-00    
Rental properties:      
Balance at the end of year $ 17,797    
Accumulated depreciation:      
Balance at the end of year $ 12,780    
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 Commons      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 264    
Encumbrance $ 57,703    
Initial cost      
Land 12,555    
Buildings and improvements 29,307    
Costs capitalized subsequent to acquisition 12,511    
Gross amount carried at close of period      
Land and improvements 12,556    
Buildings and improvements 41,817    
Total 54,373    
Accumulated depreciation $ (22,749)    
Date of construction 1973    
Date acquired Jul-10    
Rental properties:      
Balance at the end of year $ 54,373    
Accumulated depreciation:      
Balance at the end of year $ 22,749    
Encumbered Apartment Communities | The Commons | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | The Commons | 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 $ 57,299    
Initial cost      
Land 19,984    
Buildings and improvements 82,286    
Costs capitalized subsequent to acquisition 4,223    
Gross amount carried at close of period      
Land and improvements 19,990    
Buildings and improvements 86,503    
Total 106,493    
Accumulated depreciation $ (27,116)    
Date of construction 2015    
Date acquired Mar-15    
Rental properties:      
Balance at the end of year $ 106,493    
Accumulated depreciation:      
Balance at the end of year $ 27,116    
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 Galloway      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 506    
Encumbrance $ 102,841    
Initial cost      
Land 32,966    
Buildings and improvements 184,499    
Costs capitalized subsequent to acquisition 6,342    
Gross amount carried at close of period      
Land and improvements 32,966    
Buildings and improvements 190,841    
Total 223,807    
Accumulated depreciation $ (27,546)    
Date of construction 2016    
Date acquired Jan-20    
Rental properties:      
Balance at the end of year $ 223,807    
Accumulated depreciation:      
Balance at the end of year $ 27,546    
Encumbered Apartment Communities | The Galloway | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Encumbered Apartment Communities | The Galloway | 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 $ 52,156    
Initial cost      
Land 19,362    
Buildings and improvements 75,641    
Costs capitalized subsequent to acquisition 5,421    
Gross amount carried at close of period      
Land and improvements 19,371    
Buildings and improvements 81,053    
Total 100,424    
Accumulated depreciation $ (25,347)    
Date of construction 2014    
Date acquired Mar-15    
Rental properties:      
Balance at the end of year $ 100,424    
Accumulated depreciation:      
Balance at the end of year $ 25,347    
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 $ 44,700    
Initial cost      
Land 19,812    
Buildings and improvements 70,619    
Costs capitalized subsequent to acquisition 2,375    
Gross amount carried at close of period      
Land and improvements 19,812    
Buildings and improvements 72,994    
Total 92,806    
Accumulated depreciation $ (11,257)    
Date of construction 2014    
Date acquired Sep-19    
Rental properties:      
Balance at the end of year $ 92,806    
Accumulated depreciation:      
Balance at the end of year $ 11,257    
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 | 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 | 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 47,382    
Initial cost      
Land $ 2,598,958    
Buildings and improvements 9,278,341    
Costs capitalized subsequent to acquisition 2,560,634    
Gross amount carried at close of period      
Land and improvements 2,649,202    
Buildings and improvements 11,788,731    
Total 14,437,933    
Accumulated depreciation (5,173,880)    
Rental properties:      
Balance at the end of year 14,437,933    
Accumulated depreciation:      
Balance at the end of year $ 5,173,880    
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 1,818    
Gross amount carried at close of period      
Land and improvements 4,934    
Buildings and improvements 62,239    
Total 67,173    
Accumulated depreciation $ (8,536)    
Date of construction 2016    
Date acquired Jan-20    
Rental properties:      
Balance at the end of year $ 67,173    
Accumulated depreciation:      
Balance at the end of year $ 8,536    
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 25,661    
Gross amount carried at close of period      
Land and improvements 32,136    
Buildings and improvements 154,204    
Total 186,340    
Accumulated depreciation $ (57,633)    
Date of construction 2001    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 186,340    
Accumulated depreciation:      
Balance at the end of year $ 57,633    
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 3,758    
Gross amount carried at close of period      
Land and improvements 5,869    
Buildings and improvements 27,735    
Total 33,604    
Accumulated depreciation $ (14,318)    
Date of construction 2010    
Date acquired Oct-10    
Rental properties:      
Balance at the end of year $ 33,604    
Accumulated depreciation:      
Balance at the end of year $ 14,318    
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 4,505    
Gross amount carried at close of period      
Land and improvements 11,923    
Buildings and improvements 52,195    
Total 64,118    
Accumulated depreciation $ (18,217)    
Date of construction 2002    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 64,118    
Accumulated depreciation:      
Balance at the end of year $ 18,217    
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 13,953    
Gross amount carried at close of period      
Land and improvements 4,982    
Buildings and improvements 33,666    
Total 38,648    
Accumulated depreciation $ (22,978)    
Date of construction 1971    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 38,648    
Accumulated depreciation:      
Balance at the end of year $ 22,978    
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 | 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 1,196    
Gross amount carried at close of period      
Land and improvements 4,726    
Buildings and improvements 15,426    
Total 20,152    
Accumulated depreciation $ (5,943)    
Date of construction 2009    
Date acquired Jan-13    
Rental properties:      
Balance at the end of year $ 20,152    
Accumulated depreciation:      
Balance at the end of year $ 5,943    
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 11,509    
Gross amount carried at close of period      
Land and improvements 44,240    
Buildings and improvements 114,760    
Total 159,000    
Accumulated depreciation $ (36,789)    
Date of construction 2014    
Date acquired Aug-14    
Rental properties:      
Balance at the end of year $ 159,000    
Accumulated depreciation:      
Balance at the end of year $ 36,789    
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 26,945    
Gross amount carried at close of period      
Land and improvements 58,442    
Buildings and improvements 202,271    
Total 260,713    
Accumulated depreciation $ (75,176)    
Date of construction 2001    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 260,713    
Accumulated depreciation:      
Balance at the end of year $ 75,176    
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 3,685    
Gross amount carried at close of period      
Land and improvements 3,924    
Buildings and improvements 15,547    
Total 19,471    
Accumulated depreciation $ (6,867)    
Date of construction 1988    
Date acquired Oct-12    
Rental properties:      
Balance at the end of year $ 19,471    
Accumulated depreciation:      
Balance at the end of year $ 6,867    
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 3,301    
Gross amount carried at close of period      
Land and improvements 23,550    
Buildings and improvements 97,112    
Total 120,662    
Accumulated depreciation $ (24,127)    
Date of construction 2014    
Date acquired Dec-16    
Rental properties:      
Balance at the end of year $ 120,662    
Accumulated depreciation:      
Balance at the end of year $ 24,127    
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 9,879    
Gross amount carried at close of period      
Land and improvements 32,379    
Buildings and improvements 147,819    
Total 180,198    
Accumulated depreciation $ (42,593)    
Date of construction 2014    
Date acquired Jun-15    
Rental properties:      
Balance at the end of year $ 180,198    
Accumulated depreciation:      
Balance at the end of year $ 42,593    
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 18,098    
Gross amount carried at close of period      
Land and improvements 27,235    
Buildings and improvements 82,501    
Total 109,736    
Accumulated depreciation $ (28,266)    
Date of construction 2007    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 109,736    
Accumulated depreciation:      
Balance at the end of year $ 28,266    
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 3,145    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 52,958    
Total 52,958    
Accumulated depreciation $ (19,372)    
Date of construction 2013    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 52,958    
Accumulated depreciation:      
Balance at the end of year $ 19,372    
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 33,446    
Gross amount carried at close of period      
Land and improvements 10,601    
Buildings and improvements 57,903    
Total 68,504    
Accumulated depreciation $ (44,086)    
Date of construction 1970    
Date acquired Jan-99    
Rental properties:      
Balance at the end of year $ 68,504    
Accumulated depreciation:      
Balance at the end of year $ 44,086    
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 50,318    
Gross amount carried at close of period      
Land and improvements 12,682    
Buildings and improvements 67,993    
Total 80,675    
Accumulated depreciation $ (53,742)    
Date of construction 1988    
Date acquired Jan-95    
Rental properties:      
Balance at the end of year $ 80,675    
Accumulated depreciation:      
Balance at the end of year $ 53,742    
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 6,974    
Gross amount carried at close of period      
Land and improvements 21,725    
Buildings and improvements 99,065    
Total 120,790    
Accumulated depreciation $ (34,031)    
Date of construction 2009    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 120,790    
Accumulated depreciation:      
Balance at the end of year $ 34,031    
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 8,891    
Gross amount carried at close of period      
Land and improvements 17,247    
Buildings and improvements 49,234    
Total 66,481    
Accumulated depreciation $ (22,441)    
Date of construction 2004    
Date acquired Sep-10    
Rental properties:      
Balance at the end of year $ 66,481    
Accumulated depreciation:      
Balance at the end of year $ 22,441    
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 7,536    
Gross amount carried at close of period      
Land and improvements 16,197    
Buildings and improvements 74,743    
Total 90,940    
Accumulated depreciation $ (27,769)    
Date of construction 2001    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 90,940    
Accumulated depreciation:      
Balance at the end of year $ 27,769    
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 1,940    
Gross amount carried at close of period      
Land and improvements 5,401    
Buildings and improvements 23,743    
Total 29,144    
Accumulated depreciation $ (10,973)    
Date of construction 2011    
Date acquired Aug-11    
Rental properties:      
Balance at the end of year $ 29,144    
Accumulated depreciation:      
Balance at the end of year $ 10,973    
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 8,603    
Gross amount carried at close of period      
Land and improvements 4,473    
Buildings and improvements 18,866    
Total 23,339    
Accumulated depreciation $ (12,941)    
Date of construction 1974    
Date acquired Oct-06    
Rental properties:      
Balance at the end of year $ 23,339    
Accumulated depreciation:      
Balance at the end of year $ 12,941    
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 179    
Initial cost      
Land $ 21,771    
Buildings and improvements 50,800    
Costs capitalized subsequent to acquisition 35,727    
Gross amount carried at close of period      
Land and improvements 28,371    
Buildings and improvements 79,927    
Total 108,298    
Accumulated depreciation $ (33,192)    
Date of construction 2004    
Date acquired Dec-12    
Rental properties:      
Balance at the end of year $ 108,298    
Accumulated depreciation:      
Balance at the end of year $ 33,192    
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 8,363    
Gross amount carried at close of period      
Land and improvements 10,802    
Buildings and improvements 51,572    
Total 62,374    
Accumulated depreciation $ (19,230)    
Date of construction 1988    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 62,374    
Accumulated depreciation:      
Balance at the end of year $ 19,230    
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 7,317    
Gross amount carried at close of period      
Land and improvements 2,503    
Buildings and improvements 17,223    
Total 19,726    
Accumulated depreciation $ (12,311)    
Date of construction 1983    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 19,726    
Accumulated depreciation:      
Balance at the end of year $ 12,311    
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 16,885    
Gross amount carried at close of period      
Land and improvements 3,580    
Buildings and improvements 25,007    
Total 28,587    
Accumulated depreciation $ (21,654)    
Date of construction 1978    
Date acquired Jan-96    
Rental properties:      
Balance at the end of year $ 28,587    
Accumulated depreciation:      
Balance at the end of year $ 21,654    
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 29,386    
Gross amount carried at close of period      
Land and improvements 10,328    
Buildings and improvements 42,669    
Total 52,997    
Accumulated depreciation $ (31,628)    
Date of construction 1973    
Date acquired Jun-00    
Rental properties:      
Balance at the end of year $ 52,997    
Accumulated depreciation:      
Balance at the end of year $ 31,628    
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 7,708    
Gross amount carried at close of period      
Land and improvements 1,531    
Buildings and improvements 13,607    
Total 15,138    
Accumulated depreciation $ (10,907)    
Date of construction 1986    
Date acquired Oct-97    
Rental properties:      
Balance at the end of year $ 15,138    
Accumulated depreciation:      
Balance at the end of year $ 10,907    
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 9,940    
Gross amount carried at close of period      
Land and improvements 2,656    
Buildings and improvements 20,707    
Total 23,363    
Accumulated depreciation $ (16,472)    
Date of construction 1986    
Date acquired Dec-96    
Rental properties:      
Balance at the end of year $ 23,363    
Accumulated depreciation:      
Balance at the end of year $ 16,472    
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 12,588    
Gross amount carried at close of period      
Land and improvements 5,293    
Buildings and improvements 24,426    
Total 29,719    
Accumulated depreciation $ (20,375)    
Date of construction 1989    
Date acquired Jan-95    
Rental properties:      
Balance at the end of year $ 29,719    
Accumulated depreciation:      
Balance at the end of year $ 20,375    
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 105,664    
Gross amount carried at close of period      
Land and improvements 11,639    
Buildings and improvements 133,394    
Total 145,033    
Accumulated depreciation $ (108,050)    
Date of construction 1968    
Date acquired Mar-98    
Rental properties:      
Balance at the end of year $ 145,033    
Accumulated depreciation:      
Balance at the end of year $ 108,050    
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 11,444    
Gross amount carried at close of period      
Land and improvements 11,075    
Buildings and improvements 36,576    
Total 47,651    
Accumulated depreciation $ (31,531)    
Date of construction 1985    
Date acquired Jul-96    
Rental properties:      
Balance at the end of year $ 47,651    
Accumulated depreciation:      
Balance at the end of year $ 31,531    
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 7,558    
Gross amount carried at close of period      
Land and improvements 18,185    
Buildings and improvements 80,297    
Total 98,482    
Accumulated depreciation $ (28,576)    
Date of construction 1998    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 98,482    
Accumulated depreciation:      
Balance at the end of year $ 28,576    
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 160    
Initial cost      
Land $ 6,871    
Buildings and improvements 26,119    
Costs capitalized subsequent to acquisition 3,686    
Gross amount carried at close of period      
Land and improvements 6,931    
Buildings and improvements 29,745    
Total 36,676    
Accumulated depreciation $ (17,207)    
Date of construction 1990    
Date acquired Dec-06    
Rental properties:      
Balance at the end of year $ 36,676    
Accumulated depreciation:      
Balance at the end of year $ 17,207    
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 647    
Gross amount carried at close of period      
Land and improvements 10,489    
Buildings and improvements 37,571    
Total 48,060    
Accumulated depreciation $ (2,760)    
Date of construction 2014    
Date acquired Dec-21    
Rental properties:      
Balance at the end of year $ 48,060    
Accumulated depreciation:      
Balance at the end of year $ 2,760    
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 10,665    
Gross amount carried at close of period      
Land and improvements 19,088    
Buildings and improvements 55,138    
Total 74,226    
Accumulated depreciation $ (30,637)    
Date of construction 2005    
Date acquired May-07    
Rental properties:      
Balance at the end of year $ 74,226    
Accumulated depreciation:      
Balance at the end of year $ 30,637    
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 12,017    
Gross amount carried at close of period      
Land and improvements 4,693    
Buildings and improvements 30,304    
Total 34,997    
Accumulated depreciation $ (21,204)    
Date of construction 1990    
Date acquired Oct-03    
Rental properties:      
Balance at the end of year $ 34,997    
Accumulated depreciation:      
Balance at the end of year $ 21,204    
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 12,137    
Gross amount carried at close of period      
Land and improvements 4,048    
Buildings and improvements 24,746    
Total 28,794    
Accumulated depreciation $ (18,155)    
Date of construction 1961    
Date acquired Sep-01    
Rental properties:      
Balance at the end of year $ 28,794    
Accumulated depreciation:      
Balance at the end of year $ 18,155    
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 11,508    
Gross amount carried at close of period      
Land and improvements 26,842    
Buildings and improvements 118,876    
Total 145,718    
Accumulated depreciation $ (43,830)    
Date of construction 2000    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 145,718    
Accumulated depreciation:      
Balance at the end of year $ 43,830    
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 17,394    
Gross amount carried at close of period      
Land and improvements 16,725    
Buildings and improvements 84,295    
Total 101,020    
Accumulated depreciation $ (31,906)    
Date of construction 1989    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 101,020    
Accumulated depreciation:      
Balance at the end of year $ 31,906    
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 9,529    
Gross amount carried at close of period      
Land and improvements 14,968    
Buildings and improvements 69,400    
Total 84,368    
Accumulated depreciation $ (24,358)    
Date of construction 1989    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 84,368    
Accumulated depreciation:      
Balance at the end of year $ 24,358    
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 8,333    
Gross amount carried at close of period      
Land and improvements 4,833    
Buildings and improvements 23,677    
Total 28,510    
Accumulated depreciation $ (19,463)    
Date of construction 1998    
Date acquired Dec-98    
Rental properties:      
Balance at the end of year $ 28,510    
Accumulated depreciation:      
Balance at the end of year $ 19,463    
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 4,745    
Gross amount carried at close of period      
Land and improvements 6,714    
Buildings and improvements 31,601    
Total 38,315    
Accumulated depreciation $ (11,166)    
Date of construction 1987    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 38,315    
Accumulated depreciation:      
Balance at the end of year $ 11,166    
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 | 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 11,649    
Gross amount carried at close of period      
Land and improvements 5,652    
Buildings and improvements 27,982    
Total 33,634    
Accumulated depreciation $ (17,938)    
Date of construction 1984    
Date acquired Jan-05    
Rental properties:      
Balance at the end of year $ 33,634    
Accumulated depreciation:      
Balance at the end of year $ 17,938    
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 24,377    
Gross amount carried at close of period      
Land and improvements 3,442    
Buildings and improvements 32,083    
Total 35,525    
Accumulated depreciation $ (26,545)    
Date of construction 1974    
Date acquired Jun-97    
Rental properties:      
Balance at the end of year $ 35,525    
Accumulated depreciation:      
Balance at the end of year $ 26,545    
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 3,055    
Gross amount carried at close of period      
Land and improvements 6,582    
Buildings and improvements 18,744    
Total 25,326    
Accumulated depreciation $ (10,012)    
Date of construction 2002    
Date acquired Jul-08    
Rental properties:      
Balance at the end of year $ 25,326    
Accumulated depreciation:      
Balance at the end of year $ 10,012    
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 41,860    
Gross amount carried at close of period      
Land and improvements 10,350    
Buildings and improvements 79,063    
Total 89,413    
Accumulated depreciation $ (63,724)    
Date of construction 1975    
Date acquired Mar-98    
Rental properties:      
Balance at the end of year $ 89,413    
Accumulated depreciation:      
Balance at the end of year $ 63,724    
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 1,076    
Gross amount carried at close of period      
Land and improvements 7,276    
Buildings and improvements 23,302    
Total 30,578    
Accumulated depreciation $ (7,783)    
Date of construction 2013    
Date acquired May-14    
Rental properties:      
Balance at the end of year $ 30,578    
Accumulated depreciation:      
Balance at the end of year $ 7,783    
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 5,503    
Gross amount carried at close of period      
Land and improvements 19,949    
Buildings and improvements 128,931    
Total 148,880    
Accumulated depreciation $ (18,748)    
Date of construction 2014    
Date acquired Jan-20    
Rental properties:      
Balance at the end of year $ 148,880    
Accumulated depreciation:      
Balance at the end of year $ 18,748    
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 5,758    
Gross amount carried at close of period      
Land and improvements 5,801    
Buildings and improvements 23,173    
Total 28,974    
Accumulated depreciation $ (11,369)    
Date of construction 1978    
Date acquired Nov-10    
Rental properties:      
Balance at the end of year $ 28,974    
Accumulated depreciation:      
Balance at the end of year $ 11,369    
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 6,220    
Gross amount carried at close of period      
Land and improvements 13,912    
Buildings and improvements 61,869    
Total 75,781    
Accumulated depreciation $ (21,883)    
Date of construction 1999    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 75,781    
Accumulated depreciation:      
Balance at the end of year $ 21,883    
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 7,719    
Gross amount carried at close of period      
Land and improvements 4,187    
Buildings and improvements 24,289    
Total 28,476    
Accumulated depreciation $ (17,013)    
Date of construction 1976    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 28,476    
Accumulated depreciation:      
Balance at the end of year $ 17,013    
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 7,676    
Gross amount carried at close of period      
Land and improvements 7,465    
Buildings and improvements 29,081    
Total 36,546    
Accumulated depreciation $ (14,010)    
Date of construction 2000    
Date acquired Oct-10    
Rental properties:      
Balance at the end of year $ 36,546    
Accumulated depreciation:      
Balance at the end of year $ 14,010    
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 19,142    
Gross amount carried at close of period      
Land and improvements 37,579    
Buildings and improvements 106,827    
Total 144,406    
Accumulated depreciation $ (41,200)    
Date of construction 1992    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 144,406    
Accumulated depreciation:      
Balance at the end of year $ 41,200    
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 6,200    
Gross amount carried at close of period      
Land and improvements 21,478    
Buildings and improvements 56,316    
Total 77,794    
Accumulated depreciation $ (20,508)    
Date of construction 1996    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 77,794    
Accumulated depreciation:      
Balance at the end of year $ 20,508    
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 2,016    
Gross amount carried at close of period      
Land and improvements 9,059    
Buildings and improvements 29,193    
Total 38,252    
Accumulated depreciation $ (11,604)    
Date of construction 2009    
Date acquired Sep-12    
Rental properties:      
Balance at the end of year $ 38,252    
Accumulated depreciation:      
Balance at the end of year $ 11,604    
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 8,926    
Gross amount carried at close of period      
Land and improvements 4,757    
Buildings and improvements 23,212    
Total 27,969    
Accumulated depreciation $ (13,693)    
Date of construction 1986    
Date acquired Jun-10    
Rental properties:      
Balance at the end of year $ 27,969    
Accumulated depreciation:      
Balance at the end of year $ 13,693    
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 6,721    
Gross amount carried at close of period      
Land and improvements 15,066    
Buildings and improvements 51,970    
Total 67,036    
Accumulated depreciation $ (18,149)    
Date of construction 1994    
Date acquired Jul-14    
Rental properties:      
Balance at the end of year $ 67,036    
Accumulated depreciation:      
Balance at the end of year $ 18,149    
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 3,854    
Gross amount carried at close of period      
Land and improvements 8,458    
Buildings and improvements 37,686    
Total 46,144    
Accumulated depreciation $ (13,690)    
Date of construction 1989    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 46,144    
Accumulated depreciation:      
Balance at the end of year $ 13,690    
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 8,762    
Gross amount carried at close of period      
Land and improvements 3,449    
Buildings and improvements 16,563    
Total 20,012    
Accumulated depreciation $ (14,422)    
Date of construction 1987    
Date acquired Nov-94    
Rental properties:      
Balance at the end of year $ 20,012    
Accumulated depreciation:      
Balance at the end of year $ 14,422    
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 2,731    
Gross amount carried at close of period      
Land and improvements 13,378    
Buildings and improvements 55,971    
Total 69,349    
Accumulated depreciation $ (14,061)    
Date of construction 2012    
Date acquired Dec-16    
Rental properties:      
Balance at the end of year $ 69,349    
Accumulated depreciation:      
Balance at the end of year $ 14,061    
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 1,602    
Gross amount carried at close of period      
Land and improvements 15,039    
Buildings and improvements 82,134    
Total 97,173    
Accumulated depreciation $ (11,594)    
Date of construction 2015    
Date acquired Jan-20    
Rental properties:      
Balance at the end of year $ 97,173    
Accumulated depreciation:      
Balance at the end of year $ 11,594    
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 3,565    
Gross amount carried at close of period      
Land and improvements 21,397    
Buildings and improvements 74,700    
Total 96,097    
Accumulated depreciation $ (21,195)    
Date of construction 2014    
Date acquired Dec-15    
Rental properties:      
Balance at the end of year $ 96,097    
Accumulated depreciation:      
Balance at the end of year $ 21,195    
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 5,723    
Gross amount carried at close of period      
Land and improvements 89,111    
Buildings and improvements 313,492    
Total 402,603    
Accumulated depreciation $ (43,577)    
Date of construction 2013    
Date acquired Jan-20    
Rental properties:      
Balance at the end of year $ 402,603    
Accumulated depreciation:      
Balance at the end of year $ 43,577    
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 18,769    
Gross amount carried at close of period      
Land and improvements 18,429    
Buildings and improvements 58,596    
Total 77,025    
Accumulated depreciation $ (40,654)    
Date of construction 2002    
Date acquired Apr-04    
Rental properties:      
Balance at the end of year $ 77,025    
Accumulated depreciation:      
Balance at the end of year $ 40,654    
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 19,047    
Gross amount carried at close of period      
Land and improvements 21,537    
Buildings and improvements 165,146    
Total 186,683    
Accumulated depreciation $ (68,901)    
Date of construction 2008    
Date acquired Apr-10    
Rental properties:      
Balance at the end of year $ 186,683    
Accumulated depreciation:      
Balance at the end of year $ 68,901    
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 9,409    
Gross amount carried at close of period      
Land and improvements 3,649    
Buildings and improvements 22,721    
Total 26,370    
Accumulated depreciation $ (18,796)    
Date of construction 1990    
Date acquired Jun-97    
Rental properties:      
Balance at the end of year $ 26,370    
Accumulated depreciation:      
Balance at the end of year $ 18,796    
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 11,748    
Gross amount carried at close of period      
Land and improvements 2,957    
Buildings and improvements 21,902    
Total 24,859    
Accumulated depreciation $ (17,103)    
Date of construction 1970    
Date acquired Nov-01    
Rental properties:      
Balance at the end of year $ 24,859    
Accumulated depreciation:      
Balance at the end of year $ 17,103    
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 9,654    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 17,504    
Total 17,504    
Accumulated depreciation $ (15,324)    
Date of construction 1972    
Date acquired Jun-99    
Rental properties:      
Balance at the end of year $ 17,504    
Accumulated depreciation:      
Balance at the end of year $ 15,324    
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 6,603    
Gross amount carried at close of period      
Land and improvements 5,297    
Buildings and improvements 22,166    
Total 27,463    
Accumulated depreciation $ (14,306)    
Date of construction 1997    
Date acquired Oct-04    
Rental properties:      
Balance at the end of year $ 27,463    
Accumulated depreciation:      
Balance at the end of year $ 14,306    
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 44,756    
Gross amount carried at close of period      
Land and improvements 2,440    
Buildings and improvements 54,572    
Total 57,012    
Accumulated depreciation $ (51,045)    
Date of construction 1978    
Date acquired Mar-90    
Rental properties:      
Balance at the end of year $ 57,012    
Accumulated depreciation:      
Balance at the end of year $ 51,045    
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 15,512    
Gross amount carried at close of period      
Land and improvements 5,964    
Buildings and improvements 29,415    
Total 35,379    
Accumulated depreciation $ (24,065)    
Date of construction 1985    
Date acquired Feb-97    
Rental properties:      
Balance at the end of year $ 35,379    
Accumulated depreciation:      
Balance at the end of year $ 24,065    
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 5,619    
Gross amount carried at close of period      
Land and improvements 3,731    
Buildings and improvements 20,149    
Total 23,880    
Accumulated depreciation $ (13,213)    
Date of construction 1998    
Date acquired Oct-03    
Rental properties:      
Balance at the end of year $ 23,880    
Accumulated depreciation:      
Balance at the end of year $ 13,213    
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 | Form 15      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 242    
Initial cost      
Land $ 24,510    
Buildings and improvements 72,221    
Costs capitalized subsequent to acquisition 14,885    
Gross amount carried at close of period      
Land and improvements 25,540    
Buildings and improvements 86,076    
Total 111,616    
Accumulated depreciation $ (24,271)    
Date of construction 2014    
Date acquired Mar-16    
Rental properties:      
Balance at the end of year $ 111,616    
Accumulated depreciation:      
Balance at the end of year $ 24,271    
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 18,648    
Gross amount carried at close of period      
Land and improvements 61,714    
Buildings and improvements 162,648    
Total 224,362    
Accumulated depreciation $ (60,005)    
Date of construction 1987    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 224,362    
Accumulated depreciation:      
Balance at the end of year $ 60,005    
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 16,464    
Gross amount carried at close of period      
Land and improvements 6,985    
Buildings and improvements 43,487    
Total 50,472    
Accumulated depreciation $ (35,378)    
Date of construction 2000    
Date acquired Mar-00    
Rental properties:      
Balance at the end of year $ 50,472    
Accumulated depreciation:      
Balance at the end of year $ 35,378    
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 9,144    
Gross amount carried at close of period      
Land and improvements 26,046    
Buildings and improvements 69,917    
Total 95,963    
Accumulated depreciation $ (26,176)    
Date of construction 1990    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 95,963    
Accumulated depreciation:      
Balance at the end of year $ 26,176    
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 5,944    
Gross amount carried at close of period      
Land and improvements 8,879    
Buildings and improvements 58,295    
Total 67,174    
Accumulated depreciation $ (27,867)    
Date of construction 2010    
Date acquired Apr-10    
Rental properties:      
Balance at the end of year $ 67,174    
Accumulated depreciation:      
Balance at the end of year $ 27,867    
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 43,656    
Gross amount carried at close of period      
Land and improvements 39,731    
Buildings and improvements 136,362    
Total 176,093    
Accumulated depreciation $ (63,688)    
Date of construction 1968    
Date acquired Feb-13    
Rental properties:      
Balance at the end of year $ 176,093    
Accumulated depreciation:      
Balance at the end of year $ 63,688    
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 | Hacienda at Camarillo Oaks      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 73    
Initial cost      
Land $ 5,497    
Buildings and improvements 17,572    
Costs capitalized subsequent to acquisition 2,464    
Gross amount carried at close of period      
Land and improvements 5,497    
Buildings and improvements 20,036    
Total 25,533    
Accumulated depreciation $ (522)    
Date of construction 1984    
Date acquired Apr-23    
Rental properties:      
Balance at the end of year $ 25,533    
Accumulated depreciation:      
Balance at the end of year $ 522    
Unencumbered Apartment Communities | Hacienda at Camarillo Oaks | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Hacienda at Camarillo Oaks | 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 31,710    
Gross amount carried at close of period      
Land and improvements 6,733    
Buildings and improvements 48,425    
Total 55,158    
Accumulated depreciation $ (39,183)    
Date of construction 1970    
Date acquired Jun-99    
Rental properties:      
Balance at the end of year $ 55,158    
Accumulated depreciation:      
Balance at the end of year $ 39,183    
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 17,578    
Gross amount carried at close of period      
Land and improvements 16,271    
Buildings and improvements 66,510    
Total 82,781    
Accumulated depreciation $ (39,218)    
Date of construction 2000    
Date acquired Aug-08    
Rental properties:      
Balance at the end of year $ 82,781    
Accumulated depreciation:      
Balance at the end of year $ 39,218    
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 29,837    
Gross amount carried at close of period      
Land and improvements 15,755    
Buildings and improvements 70,001    
Total 85,756    
Accumulated depreciation $ (53,986)    
Date of construction 1973    
Date acquired Mar-98    
Rental properties:      
Balance at the end of year $ 85,756    
Accumulated depreciation:      
Balance at the end of year $ 53,986    
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 42,417    
Gross amount carried at close of period      
Land and improvements 22,000    
Buildings and improvements 137,098    
Total 159,098    
Accumulated depreciation $ (81,397)    
Date of construction 1948    
Date acquired Sep-06    
Rental properties:      
Balance at the end of year $ 159,098    
Accumulated depreciation:      
Balance at the end of year $ 81,397    
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 3,986    
Gross amount carried at close of period      
Land and improvements 4,208    
Buildings and improvements 20,733    
Total 24,941    
Accumulated depreciation $ (11,834)    
Date of construction 1965    
Date acquired Mar-07    
Rental properties:      
Balance at the end of year $ 24,941    
Accumulated depreciation:      
Balance at the end of year $ 11,834    
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 26,749    
Gross amount carried at close of period      
Land and improvements 9,315    
Buildings and improvements 49,460    
Total 58,775    
Accumulated depreciation $ (41,562)    
Date of construction 1984    
Date acquired Oct-97    
Rental properties:      
Balance at the end of year $ 58,775    
Accumulated depreciation:      
Balance at the end of year $ 41,562    
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 10,148    
Gross amount carried at close of period      
Land and improvements 3,474    
Buildings and improvements 18,022    
Total 21,496    
Accumulated depreciation $ (15,994)    
Date of construction 1985    
Date acquired Oct-94    
Rental properties:      
Balance at the end of year $ 21,496    
Accumulated depreciation:      
Balance at the end of year $ 15,994    
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 9,261    
Gross amount carried at close of period      
Land and improvements 17,774    
Buildings and improvements 50,734    
Total 68,508    
Accumulated depreciation $ (18,567)    
Date of construction 1973    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 68,508    
Accumulated depreciation:      
Balance at the end of year $ 18,567    
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 15,358    
Gross amount carried at close of period      
Land and improvements 38,155    
Buildings and improvements 104,386    
Total 142,541    
Accumulated depreciation $ (38,936)    
Date of construction 1988    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 142,541    
Accumulated depreciation:      
Balance at the end of year $ 38,936    
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 9,494    
Gross amount carried at close of period      
Land and improvements 1,595    
Buildings and improvements 15,888    
Total 17,483    
Accumulated depreciation $ (13,520)    
Date of construction 1981    
Date acquired Dec-96    
Rental properties:      
Balance at the end of year $ 17,483    
Accumulated depreciation:      
Balance at the end of year $ 13,520    
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 | 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 16,203    
Gross amount carried at close of period      
Land and improvements 3,092    
Buildings and improvements 23,622    
Total 26,714    
Accumulated depreciation $ (20,121)    
Date of construction 1975    
Date acquired Feb-94    
Rental properties:      
Balance at the end of year $ 26,714    
Accumulated depreciation:      
Balance at the end of year $ 20,121    
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 12,518    
Gross amount carried at close of period      
Land and improvements 4,760    
Buildings and improvements 31,063    
Total 35,823    
Accumulated depreciation $ (22,713)    
Date of construction 1987    
Date acquired Sep-02    
Rental properties:      
Balance at the end of year $ 35,823    
Accumulated depreciation:      
Balance at the end of year $ 22,713    
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 35,482    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 63,649    
Total 63,649    
Accumulated depreciation $ (41,034)    
Date of construction 1971    
Date acquired Jan-04    
Rental properties:      
Balance at the end of year $ 63,649    
Accumulated depreciation:      
Balance at the end of year $ 41,034    
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 19,363    
Gross amount carried at close of period      
Land and improvements 5,324    
Buildings and improvements 35,790    
Total 41,114    
Accumulated depreciation $ (32,469)    
Date of construction 1974    
Date acquired Jun-94    
Rental properties:      
Balance at the end of year $ 41,114    
Accumulated depreciation:      
Balance at the end of year $ 32,469    
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 3,639    
Gross amount carried at close of period      
Land and improvements 1,562    
Buildings and improvements 9,735    
Total 11,297    
Accumulated depreciation $ (7,468)    
Date of construction 1987    
Date acquired May-00    
Rental properties:      
Balance at the end of year $ 11,297    
Accumulated depreciation:      
Balance at the end of year $ 7,468    
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 16,253    
Gross amount carried at close of period      
Land and improvements 42,001    
Buildings and improvements 228,901    
Total 270,902    
Accumulated depreciation $ (73,498)    
Date of construction 2014    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 270,902    
Accumulated depreciation:      
Balance at the end of year $ 73,498    
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 3,507    
Gross amount carried at close of period      
Land and improvements 1,894    
Buildings and improvements 10,999    
Total 12,893    
Accumulated depreciation $ (7,755)    
Date of construction 1963    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 12,893    
Accumulated depreciation:      
Balance at the end of year $ 7,755    
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 14,805    
Gross amount carried at close of period      
Land and improvements 29,551    
Buildings and improvements 83,837    
Total 113,388    
Accumulated depreciation $ (45,026)    
Date of construction 2005    
Date acquired Sep-07    
Rental properties:      
Balance at the end of year $ 113,388    
Accumulated depreciation:      
Balance at the end of year $ 45,026    
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 2,153    
Gross amount carried at close of period      
Land and improvements 11,012    
Buildings and improvements 42,135    
Total 53,147    
Accumulated depreciation $ (11,663)    
Date of construction 2015    
Date acquired Jan-16    
Rental properties:      
Balance at the end of year $ 53,147    
Accumulated depreciation:      
Balance at the end of year $ 11,663    
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 20,139    
Gross amount carried at close of period      
Land and improvements 6,270    
Buildings and improvements 46,722    
Total 52,992    
Accumulated depreciation $ (33,524)    
Date of construction 2000    
Date acquired May-00    
Rental properties:      
Balance at the end of year $ 52,992    
Accumulated depreciation:      
Balance at the end of year $ 33,524    
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 16,734    
Gross amount carried at close of period      
Land and improvements 7,186    
Buildings and improvements 45,172    
Total 52,358    
Accumulated depreciation $ (32,198)    
Date of construction 1982    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 52,358    
Accumulated depreciation:      
Balance at the end of year $ 32,198    
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 20,649    
Gross amount carried at close of period      
Land and improvements 7,886    
Buildings and improvements 43,629    
Total 51,515    
Accumulated depreciation $ (34,078)    
Date of construction 1988    
Date acquired Aug-97    
Rental properties:      
Balance at the end of year $ 51,515    
Accumulated depreciation:      
Balance at the end of year $ 34,078    
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 15,512    
Gross amount carried at close of period      
Land and improvements 10,167    
Buildings and improvements 54,222    
Total 64,389    
Accumulated depreciation $ (35,135)    
Date of construction 1984    
Date acquired Jul-05    
Rental properties:      
Balance at the end of year $ 64,389    
Accumulated depreciation:      
Balance at the end of year $ 35,135    
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 13,839    
Gross amount carried at close of period      
Land and improvements 46,499    
Buildings and improvements 122,337    
Total 168,836    
Accumulated depreciation $ (44,778)    
Date of construction 1995    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 168,836    
Accumulated depreciation:      
Balance at the end of year $ 44,778    
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 12,394    
Gross amount carried at close of period      
Land and improvements 31,429    
Buildings and improvements 85,728    
Total 117,157    
Accumulated depreciation $ (32,318)    
Date of construction 1989    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 117,157    
Accumulated depreciation:      
Balance at the end of year $ 32,318    
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 15,499    
Gross amount carried at close of period      
Land and improvements 26,697    
Buildings and improvements 122,286    
Total 148,983    
Accumulated depreciation $ (43,193)    
Date of construction 1990    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 148,983    
Accumulated depreciation:      
Balance at the end of year $ 43,193    
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 32,229    
Gross amount carried at close of period      
Land and improvements 4,997    
Buildings and improvements 51,850    
Total 56,847    
Accumulated depreciation $ (47,688)    
Date of construction 1973    
Date acquired Dec-88    
Rental properties:      
Balance at the end of year $ 56,847    
Accumulated depreciation:      
Balance at the end of year $ 47,688    
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 15,803    
Gross amount carried at close of period      
Land and improvements 13,858    
Buildings and improvements 57,377    
Total 71,235    
Accumulated depreciation $ (23,364)    
Date of construction 1996    
Date acquired Jul-12    
Rental properties:      
Balance at the end of year $ 71,235    
Accumulated depreciation:      
Balance at the end of year $ 23,364    
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 6,287    
Gross amount carried at close of period      
Land and improvements 2,194    
Buildings and improvements 13,703    
Total 15,897    
Accumulated depreciation $ (9,460)    
Date of construction 1974    
Date acquired Nov-01    
Rental properties:      
Balance at the end of year $ 15,897    
Accumulated depreciation:      
Balance at the end of year $ 9,460    
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 8,980    
Gross amount carried at close of period      
Land and improvements 2,424    
Buildings and improvements 14,484    
Total 16,908    
Accumulated depreciation $ (11,089)    
Date of construction 1974    
Date acquired Jul-97    
Rental properties:      
Balance at the end of year $ 16,908    
Accumulated depreciation:      
Balance at the end of year $ 11,089    
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 7,109    
Gross amount carried at close of period      
Land and improvements 7,823    
Buildings and improvements 40,544    
Total 48,367    
Accumulated depreciation $ (19,798)    
Date of construction 2011    
Date acquired Feb-11    
Rental properties:      
Balance at the end of year $ 48,367    
Accumulated depreciation:      
Balance at the end of year $ 19,798    
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 867    
Gross amount carried at close of period      
Land and improvements 6,472    
Buildings and improvements 206,965    
Total 213,437    
Accumulated depreciation $ (35,556)    
Date of construction 2021    
Date acquired Jun-21    
Rental properties:      
Balance at the end of year $ 213,437    
Accumulated depreciation:      
Balance at the end of year $ 35,556    
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 11,284    
Gross amount carried at close of period      
Land and improvements 9,359    
Buildings and improvements 33,129    
Total 42,488    
Accumulated depreciation $ (17,925)    
Date of construction 1971    
Date acquired Mar-11    
Rental properties:      
Balance at the end of year $ 42,488    
Accumulated depreciation:      
Balance at the end of year $ 17,925    
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 33,448    
Gross amount carried at close of period      
Land and improvements 133,802    
Buildings and improvements 345,653    
Total 479,455    
Accumulated depreciation $ (91,453)    
Date of construction 2008    
Date acquired Jan-17    
Rental properties:      
Balance at the end of year $ 479,455    
Accumulated depreciation:      
Balance at the end of year $ 91,453    
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 | 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 4,825    
Gross amount carried at close of period      
Land and improvements 4,710    
Buildings and improvements 23,664    
Total 28,374    
Accumulated depreciation $ (10,795)    
Date of construction 2002    
Date acquired Jun-12    
Rental properties:      
Balance at the end of year $ 28,374    
Accumulated depreciation:      
Balance at the end of year $ 10,795    
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 15,944    
Gross amount carried at close of period      
Land and improvements 9,391    
Buildings and improvements 54,168    
Total 63,559    
Accumulated depreciation $ (25,009)    
Date of construction 1993    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 63,559    
Accumulated depreciation:      
Balance at the end of year $ 25,009    
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 15,309    
Gross amount carried at close of period      
Land and improvements 7,284    
Buildings and improvements 37,246    
Total 44,530    
Accumulated depreciation $ (24,420)    
Date of construction 1999    
Date acquired Feb-99    
Rental properties:      
Balance at the end of year $ 44,530    
Accumulated depreciation:      
Balance at the end of year $ 24,420    
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 7,165    
Gross amount carried at close of period      
Land and improvements 15,894    
Buildings and improvements 70,739    
Total 86,633    
Accumulated depreciation $ (25,521)    
Date of construction 2008    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 86,633    
Accumulated depreciation:      
Balance at the end of year $ 25,521    
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 14,824    
Gross amount carried at close of period      
Land and improvements 9,424    
Buildings and improvements 36,812    
Total 46,236    
Accumulated depreciation $ (19,991)    
Date of construction 1958    
Date acquired Sep-12    
Rental properties:      
Balance at the end of year $ 46,236    
Accumulated depreciation:      
Balance at the end of year $ 19,991    
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 4,885    
Gross amount carried at close of period      
Land and improvements 10,680    
Buildings and improvements 47,607    
Total 58,287    
Accumulated depreciation $ (17,576)    
Date of construction 1989    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 58,287    
Accumulated depreciation:      
Balance at the end of year $ 17,576    
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 8,927    
Gross amount carried at close of period      
Land and improvements 14,558    
Buildings and improvements 78,344    
Total 92,902    
Accumulated depreciation $ (38,284)    
Date of construction 2010    
Date acquired Mar-10    
Rental properties:      
Balance at the end of year $ 92,902    
Accumulated depreciation:      
Balance at the end of year $ 38,284    
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 24,405    
Gross amount carried at close of period      
Land and improvements 6,239    
Buildings and improvements 39,006    
Total 45,245    
Accumulated depreciation $ (35,534)    
Date of construction 1975    
Date acquired Feb-91    
Rental properties:      
Balance at the end of year $ 45,245    
Accumulated depreciation:      
Balance at the end of year $ 35,534    
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 20,462    
Gross amount carried at close of period      
Land and improvements 19,848    
Buildings and improvements 80,068    
Total 99,916    
Accumulated depreciation $ (32,025)    
Date of construction 1969    
Date acquired May-14    
Rental properties:      
Balance at the end of year $ 99,916    
Accumulated depreciation:      
Balance at the end of year $ 32,025    
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 943    
Gross amount carried at close of period      
Land and improvements 0    
Buildings and improvements 2,654    
Total 2,654    
Accumulated depreciation $ (2,051)    
Date of construction 1973    
Date acquired Dec-04    
Rental properties:      
Balance at the end of year $ 2,654    
Accumulated depreciation:      
Balance at the end of year $ 2,051    
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 7,172    
Gross amount carried at close of period      
Land and improvements 11,019    
Buildings and improvements 53,104    
Total 64,123    
Accumulated depreciation $ (19,644)    
Date of construction 2004    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 64,123    
Accumulated depreciation:      
Balance at the end of year $ 19,644    
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 5,950    
Gross amount carried at close of period      
Land and improvements 7,760    
Buildings and improvements 36,991    
Total 44,751    
Accumulated depreciation $ (14,124)    
Date of construction 2001    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 44,751    
Accumulated depreciation:      
Balance at the end of year $ 14,124    
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 10,646    
Gross amount carried at close of period      
Land and improvements 15,810    
Buildings and improvements 77,047    
Total 92,857    
Accumulated depreciation $ (27,583)    
Date of construction 2002    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 92,857    
Accumulated depreciation:      
Balance at the end of year $ 27,583    
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 8,560    
Gross amount carried at close of period      
Land and improvements 17,023    
Buildings and improvements 76,653    
Total 93,676    
Accumulated depreciation $ (27,583)    
Date of construction 2001    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 93,676    
Accumulated depreciation:      
Balance at the end of year $ 27,583    
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 9,934    
Gross amount carried at close of period      
Land and improvements 19,292    
Buildings and improvements 87,102    
Total 106,394    
Accumulated depreciation $ (30,087)    
Date of construction 2002    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 106,394    
Accumulated depreciation:      
Balance at the end of year $ 30,087    
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 9,882    
Gross amount carried at close of period      
Land and improvements 14,647    
Buildings and improvements 68,468    
Total 83,115    
Accumulated depreciation $ (25,042)    
Date of construction 2000    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 83,115    
Accumulated depreciation:      
Balance at the end of year $ 25,042    
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 14,682    
Gross amount carried at close of period      
Land and improvements 4,505    
Buildings and improvements 32,287    
Total 36,792    
Accumulated depreciation $ (24,253)    
Date of construction 1963    
Date acquired Aug-98    
Rental properties:      
Balance at the end of year $ 36,792    
Accumulated depreciation:      
Balance at the end of year $ 24,253    
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 2,360    
Gross amount carried at close of period      
Land and improvements 7,461    
Buildings and improvements 33,723    
Total 41,184    
Accumulated depreciation $ (5,042)    
Date of construction 2016    
Date acquired Dec-19    
Rental properties:      
Balance at the end of year $ 41,184    
Accumulated depreciation:      
Balance at the end of year $ 5,042    
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 5,077    
Gross amount carried at close of period      
Land and improvements 11,702    
Buildings and improvements 157,413    
Total 169,115    
Accumulated depreciation $ (54,824)    
Date of construction 2015    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 169,115    
Accumulated depreciation:      
Balance at the end of year $ 54,824    
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 9,418    
Gross amount carried at close of period      
Land and improvements 6,873    
Buildings and improvements 25,455    
Total 32,328    
Accumulated depreciation $ (14,905)    
Date of construction 1970    
Date acquired Jan-12    
Rental properties:      
Balance at the end of year $ 32,328    
Accumulated depreciation:      
Balance at the end of year $ 14,905    
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 5,428    
Gross amount carried at close of period      
Land and improvements 3,184    
Buildings and improvements 18,165    
Total 21,349    
Accumulated depreciation $ (9,945)    
Date of construction 1989    
Date acquired Dec-09    
Rental properties:      
Balance at the end of year $ 21,349    
Accumulated depreciation:      
Balance at the end of year $ 9,945    
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 | Regency Palm Court      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 116    
Initial cost      
Land $ 7,763    
Buildings and improvements 28,019    
Costs capitalized subsequent to acquisition 1,637    
Gross amount carried at close of period      
Land and improvements 7,763    
Buildings and improvements 29,656    
Total 37,419    
Accumulated depreciation $ (1,586)    
Date of construction 1987    
Date acquired Jul-22    
Rental properties:      
Balance at the end of year $ 37,419    
Accumulated depreciation:      
Balance at the end of year $ 1,586    
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 11,968    
Gross amount carried at close of period      
Land and improvements 27,870    
Buildings and improvements 123,450    
Total 151,320    
Accumulated depreciation $ (43,931)    
Date of construction 2007    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 151,320    
Accumulated depreciation:      
Balance at the end of year $ 43,931    
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 7,805    
Gross amount carried at close of period      
Land and improvements 25,073    
Buildings and improvements 129,119    
Total 154,192    
Accumulated depreciation $ (42,223)    
Date of construction 2010    
Date acquired Apr-15    
Rental properties:      
Balance at the end of year $ 154,192    
Accumulated depreciation:      
Balance at the end of year $ 42,223    
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 4,828    
Gross amount carried at close of period      
Land and improvements 3,801    
Buildings and improvements 16,227    
Total 20,028    
Accumulated depreciation $ (11,529)    
Date of construction 2000    
Date acquired Oct-00    
Rental properties:      
Balance at the end of year $ 20,028    
Accumulated depreciation:      
Balance at the end of year $ 11,529    
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 9,177    
Gross amount carried at close of period      
Land and improvements 3,331    
Buildings and improvements 16,671    
Total 20,002    
Accumulated depreciation $ (14,681)    
Date of construction 1986    
Date acquired Nov-94    
Rental properties:      
Balance at the end of year $ 20,002    
Accumulated depreciation:      
Balance at the end of year $ 14,681    
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 19,870    
Gross amount carried at close of period      
Land and improvements 4,173    
Buildings and improvements 78,831    
Total 83,004    
Accumulated depreciation $ (40,019)    
Date of construction 2001    
Date acquired Jul-10    
Rental properties:      
Balance at the end of year $ 83,004    
Accumulated depreciation:      
Balance at the end of year $ 40,019    
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 40,073    
Gross amount carried at close of period      
Land and improvements 22,866    
Buildings and improvements 68,974    
Total 91,840    
Accumulated depreciation $ (45,615)    
Date of construction 2003    
Date acquired Nov-03    
Rental properties:      
Balance at the end of year $ 91,840    
Accumulated depreciation:      
Balance at the end of year $ 45,615    
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 19,087    
Gross amount carried at close of period      
Land and improvements 9,582    
Buildings and improvements 59,403    
Total 68,985    
Accumulated depreciation $ (28,730)    
Date of construction 2004    
Date acquired Oct-10    
Rental properties:      
Balance at the end of year $ 68,985    
Accumulated depreciation:      
Balance at the end of year $ 28,730    
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 7,859    
Gross amount carried at close of period      
Land and improvements 2,820    
Buildings and improvements 19,021    
Total 21,841    
Accumulated depreciation $ (12,353)    
Date of construction 1983    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 21,841    
Accumulated depreciation:      
Balance at the end of year $ 12,353    
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 11,517    
Gross amount carried at close of period      
Land and improvements 19,292    
Buildings and improvements 88,685    
Total 107,977    
Accumulated depreciation $ (31,940)    
Date of construction 1986    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 107,977    
Accumulated depreciation:      
Balance at the end of year $ 31,940    
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 2,243    
Gross amount carried at close of period      
Land and improvements 7,379    
Buildings and improvements 24,381    
Total 31,760    
Accumulated depreciation $ (8,886)    
Date of construction 2013    
Date acquired Sep-13    
Rental properties:      
Balance at the end of year $ 31,760    
Accumulated depreciation:      
Balance at the end of year $ 8,886    
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 9,114    
Gross amount carried at close of period      
Land and improvements 34,444    
Buildings and improvements 156,376    
Total 190,820    
Accumulated depreciation $ (57,770)    
Date of construction 2014    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 190,820    
Accumulated depreciation:      
Balance at the end of year $ 57,770    
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      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 599    
Initial cost      
Land $ 54,782    
Buildings and improvements 314,694    
Costs capitalized subsequent to acquisition 111,597    
Gross amount carried at close of period      
Land and improvements 67,204    
Buildings and improvements 413,869    
Total 481,073    
Accumulated depreciation $ (79,930)    
Date of construction 2018    
Date acquired Mar-18    
Rental properties:      
Balance at the end of year $ 481,073    
Accumulated depreciation:      
Balance at the end of year $ 79,930    
Unencumbered Apartment Communities | Station Park Green | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | Station Park Green | 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 16,131    
Gross amount carried at close of period      
Land and improvements 1,001    
Buildings and improvements 21,708    
Total 22,709    
Accumulated depreciation $ (18,665)    
Date of construction 1975    
Date acquired Apr-00    
Rental properties:      
Balance at the end of year $ 22,709    
Accumulated depreciation:      
Balance at the end of year $ 18,665    
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 12,242    
Gross amount carried at close of period      
Land and improvements 3,201    
Buildings and improvements 24,811    
Total 28,012    
Accumulated depreciation $ (19,835)    
Date of construction 1986    
Date acquired Oct-97    
Rental properties:      
Balance at the end of year $ 28,012    
Accumulated depreciation:      
Balance at the end of year $ 19,835    
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 11,843    
Gross amount carried at close of period      
Land and improvements 2,656    
Buildings and improvements 16,759    
Total 19,415    
Accumulated depreciation $ (15,161)    
Date of construction 1988    
Date acquired Sep-88    
Rental properties:      
Balance at the end of year $ 19,415    
Accumulated depreciation:      
Balance at the end of year $ 15,161    
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 11,159    
Gross amount carried at close of period      
Land and improvements 5,977    
Buildings and improvements 34,811    
Total 40,788    
Accumulated depreciation $ (24,448)    
Date of construction 1972    
Date acquired Dec-02    
Rental properties:      
Balance at the end of year $ 40,788    
Accumulated depreciation:      
Balance at the end of year $ 24,448    
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 6,041    
Gross amount carried at close of period      
Land and improvements 13,915    
Buildings and improvements 63,741    
Total 77,656    
Accumulated depreciation $ (22,896)    
Date of construction 2008    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 77,656    
Accumulated depreciation:      
Balance at the end of year $ 22,896    
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 3,193    
Gross amount carried at close of period      
Land and improvements 9,228    
Buildings and improvements 40,104    
Total 49,332    
Accumulated depreciation $ (14,169)    
Date of construction 1992    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 49,332    
Accumulated depreciation:      
Balance at the end of year $ 14,169    
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 1,787    
Gross amount carried at close of period      
Land and improvements 6,964    
Buildings and improvements 31,709    
Total 38,673    
Accumulated depreciation $ (10,597)    
Date of construction 2014    
Date acquired Mar-14    
Rental properties:      
Balance at the end of year $ 38,673    
Accumulated depreciation:      
Balance at the end of year $ 10,597    
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 1,138    
Gross amount carried at close of period      
Land and improvements 3,689    
Buildings and improvements 12,493    
Total 16,182    
Accumulated depreciation $ (5,535)    
Date of construction 2008    
Date acquired Sep-11    
Rental properties:      
Balance at the end of year $ 16,182    
Accumulated depreciation:      
Balance at the end of year $ 5,535    
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 25,998    
Gross amount carried at close of period      
Land and improvements 4,031    
Buildings and improvements 35,517    
Total 39,548    
Accumulated depreciation $ (27,565)    
Date of construction 1979    
Date acquired Jun-97    
Rental properties:      
Balance at the end of year $ 39,548    
Accumulated depreciation:      
Balance at the end of year $ 27,565    
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 3,628    
Gross amount carried at close of period      
Land and improvements 6,939    
Buildings and improvements 24,305    
Total 31,244    
Accumulated depreciation $ (13,858)    
Date of construction 2006    
Date acquired Jun-07    
Rental properties:      
Balance at the end of year $ 31,244    
Accumulated depreciation:      
Balance at the end of year $ 13,858    
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 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 20,508    
Gross amount carried at close of period      
Land and improvements 2,824    
Buildings and improvements 30,777    
Total 33,601    
Accumulated depreciation $ (26,499)    
Date of construction 1981    
Date acquired Jan-97    
Rental properties:      
Balance at the end of year $ 33,601    
Accumulated depreciation:      
Balance at the end of year $ 26,499    
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 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 9,358    
Gross amount carried at close of period      
Land and improvements 4,531    
Buildings and improvements 98,566    
Total 103,097    
Accumulated depreciation $ (51,214)    
Date of construction 2009    
Date acquired Jan-09    
Rental properties:      
Balance at the end of year $ 103,097    
Accumulated depreciation:      
Balance at the end of year $ 51,214    
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 57,980    
Gross amount carried at close of period      
Land and improvements 8,385    
Buildings and improvements 56,591    
Total 64,976    
Accumulated depreciation $ (48,352)    
Date of construction 1972    
Date acquired Apr-97    
Rental properties:      
Balance at the end of year $ 64,976    
Accumulated depreciation:      
Balance at the end of year $ 48,352    
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 9,525    
Gross amount carried at close of period      
Land and improvements 10,374    
Buildings and improvements 51,020    
Total 61,394    
Accumulated depreciation $ (22,312)    
Date of construction 1975    
Date acquired Jun-12    
Rental properties:      
Balance at the end of year $ 61,394    
Accumulated depreciation:      
Balance at the end of year $ 22,312    
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 10,330    
Gross amount carried at close of period      
Land and improvements 33,554    
Buildings and improvements 88,622    
Total 122,176    
Accumulated depreciation $ (33,472)    
Date of construction 2001    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 122,176    
Accumulated depreciation:      
Balance at the end of year $ 33,472    
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 6,701    
Gross amount carried at close of period      
Land and improvements 1,618    
Buildings and improvements 10,565    
Total 12,183    
Accumulated depreciation $ (8,009)    
Date of construction 1971    
Date acquired Jun-97    
Rental properties:      
Balance at the end of year $ 12,183    
Accumulated depreciation:      
Balance at the end of year $ 8,009    
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 16,768    
Gross amount carried at close of period      
Land and improvements 1,565    
Buildings and improvements 23,005    
Total 24,570    
Accumulated depreciation $ (19,918)    
Date of construction 1977    
Date acquired May-90    
Rental properties:      
Balance at the end of year $ 24,570    
Accumulated depreciation:      
Balance at the end of year $ 19,918    
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 17,847    
Gross amount carried at close of period      
Land and improvements 23,584    
Buildings and improvements 112,181    
Total 135,765    
Accumulated depreciation $ (42,182)    
Date of construction 1988    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 135,765    
Accumulated depreciation:      
Balance at the end of year $ 42,182    
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 5,546    
Gross amount carried at close of period      
Land and improvements 13,574    
Buildings and improvements 59,844    
Total 73,418    
Accumulated depreciation $ (21,356)    
Date of construction 2007    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 73,418    
Accumulated depreciation:      
Balance at the end of year $ 21,356    
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 9,868    
Gross amount carried at close of period      
Land and improvements 21,930    
Buildings and improvements 97,588    
Total 119,518    
Accumulated depreciation $ (35,480)    
Date of construction 1985    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 119,518    
Accumulated depreciation:      
Balance at the end of year $ 35,480    
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 2,024    
Gross amount carried at close of period      
Land and improvements 14,634    
Buildings and improvements 50,321    
Total 64,955    
Accumulated depreciation $ (4,652)    
Date of construction 1974    
Date acquired Jun-21    
Rental properties:      
Balance at the end of year $ 64,955    
Accumulated depreciation:      
Balance at the end of year $ 4,652    
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 19,752    
Gross amount carried at close of period      
Land and improvements 15,165    
Buildings and improvements 40,895    
Total 56,060    
Accumulated depreciation $ (31,327)    
Date of construction 2000    
Date acquired Jun-00    
Rental properties:      
Balance at the end of year $ 56,060    
Accumulated depreciation:      
Balance at the end of year $ 31,327    
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 11,904    
Gross amount carried at close of period      
Land and improvements 13,661    
Buildings and improvements 65,231    
Total 78,892    
Accumulated depreciation $ (42,191)    
Date of construction 2001    
Date acquired Jan-01    
Rental properties:      
Balance at the end of year $ 78,892    
Accumulated depreciation:      
Balance at the end of year $ 42,191    
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 3,556    
Gross amount carried at close of period      
Land and improvements 6,949    
Buildings and improvements 31,352    
Total 38,301    
Accumulated depreciation $ (11,191)    
Date of construction 1987    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 38,301    
Accumulated depreciation:      
Balance at the end of year $ 11,191    
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 6,266    
Gross amount carried at close of period      
Land and improvements 3,890    
Buildings and improvements 14,654    
Total 18,544    
Accumulated depreciation $ (11,310)    
Date of construction 1985    
Date acquired Oct-97    
Rental properties:      
Balance at the end of year $ 18,544    
Accumulated depreciation:      
Balance at the end of year $ 11,310    
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 8,373    
Gross amount carried at close of period      
Land and improvements 3,761    
Buildings and improvements 21,393    
Total 25,154    
Accumulated depreciation $ (15,146)    
Date of construction 1969    
Date acquired Nov-01    
Rental properties:      
Balance at the end of year $ 25,154    
Accumulated depreciation:      
Balance at the end of year $ 15,146    
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 7,647    
Gross amount carried at close of period      
Land and improvements 22,016    
Buildings and improvements 89,901    
Total 111,917    
Accumulated depreciation $ (40,456)    
Date of construction 2011    
Date acquired Jul-11    
Rental properties:      
Balance at the end of year $ 111,917    
Accumulated depreciation:      
Balance at the end of year $ 40,456    
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 10,155    
Gross amount carried at close of period      
Land and improvements 4,962    
Buildings and improvements 27,653    
Total 32,615    
Accumulated depreciation $ (20,376)    
Date of construction 1970    
Date acquired Nov-01    
Rental properties:      
Balance at the end of year $ 32,615    
Accumulated depreciation:      
Balance at the end of year $ 20,376    
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 4,688    
Gross amount carried at close of period      
Land and improvements 38,299    
Buildings and improvements 94,053    
Total 132,352    
Accumulated depreciation $ (32,619)    
Date of construction 2010    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 132,352    
Accumulated depreciation:      
Balance at the end of year $ 32,619    
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 15,491    
Gross amount carried at close of period      
Land and improvements 13,842    
Buildings and improvements 70,858    
Total 84,700    
Accumulated depreciation $ (27,347)    
Date of construction 1974    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 84,700    
Accumulated depreciation:      
Balance at the end of year $ 27,347    
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 6,463    
Gross amount carried at close of period      
Land and improvements 6,488    
Buildings and improvements 43,231    
Total 49,719    
Accumulated depreciation $ (16,403)    
Date of construction 1971    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 49,719    
Accumulated depreciation:      
Balance at the end of year $ 16,403    
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 10,717    
Gross amount carried at close of period      
Land and improvements 5,573    
Buildings and improvements 22,618    
Total 28,191    
Accumulated depreciation $ (15,957)    
Date of construction 1963    
Date acquired Aug-04    
Rental properties:      
Balance at the end of year $ 28,191    
Accumulated depreciation:      
Balance at the end of year $ 15,957    
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 642    
Gross amount carried at close of period      
Land and improvements 5,545    
Buildings and improvements 17,277    
Total 22,822    
Accumulated depreciation $ (6,032)    
Date of construction 2013    
Date acquired Oct-13    
Rental properties:      
Balance at the end of year $ 22,822    
Accumulated depreciation:      
Balance at the end of year $ 6,032    
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 4,522    
Gross amount carried at close of period      
Land and improvements 24,005    
Buildings and improvements 84,988    
Total 108,993    
Accumulated depreciation $ (18,731)    
Date of construction 2021    
Date acquired Dec-21    
Rental properties:      
Balance at the end of year $ 108,993    
Accumulated depreciation:      
Balance at the end of year $ 18,731    
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 7,315    
Gross amount carried at close of period      
Land and improvements 4,887    
Buildings and improvements 26,454    
Total 31,341    
Accumulated depreciation $ (18,197)    
Date of construction 1964    
Date acquired Oct-03    
Rental properties:      
Balance at the end of year $ 31,341    
Accumulated depreciation:      
Balance at the end of year $ 18,197    
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 6,672    
Gross amount carried at close of period      
Land and improvements 1,296    
Buildings and improvements 11,641    
Total 12,937    
Accumulated depreciation $ (9,850)    
Date of construction 1986    
Date acquired Nov-95    
Rental properties:      
Balance at the end of year $ 12,937    
Accumulated depreciation:      
Balance at the end of year $ 9,850    
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 14,339    
Gross amount carried at close of period      
Land and improvements 2,258    
Buildings and improvements 21,346    
Total 23,604    
Accumulated depreciation $ (18,915)    
Date of construction 1990    
Date acquired Jun-94    
Rental properties:      
Balance at the end of year $ 23,604    
Accumulated depreciation:      
Balance at the end of year $ 18,915    
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 21,997    
Gross amount carried at close of period      
Land and improvements 43,194    
Buildings and improvements 123,027    
Total 166,221    
Accumulated depreciation $ (53,675)    
Date of construction 1989    
Date acquired Oct-12    
Rental properties:      
Balance at the end of year $ 166,221    
Accumulated depreciation:      
Balance at the end of year $ 53,675    
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 10,000    
Gross amount carried at close of period      
Land and improvements 30,535    
Buildings and improvements 101,604    
Total 132,139    
Accumulated depreciation $ (35,335)    
Date of construction 2008    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 132,139    
Accumulated depreciation:      
Balance at the end of year $ 35,335    
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 22,204    
Gross amount carried at close of period      
Land and improvements 56,932    
Buildings and improvements 234,202    
Total 291,134    
Accumulated depreciation $ (84,340)    
Date of construction 2014    
Date acquired Apr-14    
Rental properties:      
Balance at the end of year $ 291,134    
Accumulated depreciation:      
Balance at the end of year $ 84,340    
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 14,938    
Gross amount carried at close of period      
Land and improvements 3,797    
Buildings and improvements 21,644    
Total 25,441    
Accumulated depreciation $ (16,895)    
Date of construction 1992    
Date acquired Jan-97    
Rental properties:      
Balance at the end of year $ 25,441    
Accumulated depreciation:      
Balance at the end of year $ 16,895    
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 Court      
Real Estate and Accumulated Depreciation [Line Items]      
Apartment Homes | apartment 95    
Initial cost      
Land $ 6,383    
Buildings and improvements 23,420    
Costs capitalized subsequent to acquisition 1,077    
Gross amount carried at close of period      
Land and improvements 6,383    
Buildings and improvements 24,497    
Total 30,880    
Accumulated depreciation $ (1,303)    
Date of construction 1987    
Date acquired Jul-22    
Rental properties:      
Balance at the end of year $ 30,880    
Accumulated depreciation:      
Balance at the end of year $ 1,303    
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 18,009    
Gross amount carried at close of period      
Land and improvements 4,021    
Buildings and improvements 28,320    
Total 32,341    
Accumulated depreciation $ (27,125)    
Date of construction 1989    
Date acquired Mar-89    
Rental properties:      
Balance at the end of year $ 32,341    
Accumulated depreciation:      
Balance at the end of year $ 27,125    
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 27,519    
Gross amount carried at close of period      
Land and improvements 2,044    
Buildings and improvements 36,242    
Total 38,286    
Accumulated depreciation $ (28,182)    
Date of construction 1978    
Date acquired Mar-90    
Rental properties:      
Balance at the end of year $ 38,286    
Accumulated depreciation:      
Balance at the end of year $ 28,182    
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 7,107    
Gross amount carried at close of period      
Land and improvements 5,341    
Buildings and improvements 28,133    
Total 33,474    
Accumulated depreciation $ (18,428)    
Date of construction 1987    
Date acquired Dec-04    
Rental properties:      
Balance at the end of year $ 33,474    
Accumulated depreciation:      
Balance at the end of year $ 18,428    
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    
Unencumbered Apartment Communities | CBC and The Sweeps | Minimum      
Gross amount carried at close of period      
Life used for depreciation 3 years    
Unencumbered Apartment Communities | CBC and The Sweeps | Maximum      
Gross amount carried at close of period      
Life used for depreciation 30 years    
Other Property      
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrance $ 0    
Initial cost      
Land 80,706    
Buildings and improvements 16,587    
Costs capitalized subsequent to acquisition 15,769    
Gross amount carried at close of period      
Land and improvements 82,067    
Buildings and improvements 30,995    
Total 113,062    
Accumulated depreciation (20,791)    
Rental properties:      
Balance at the end of year 113,062    
Accumulated depreciation:      
Balance at the end of year 20,791    
Other Property | Other real estate assets      
Real Estate and Accumulated Depreciation [Line Items]      
Encumbrance 0    
Initial cost      
Land 80,706    
Buildings and improvements 16,587    
Costs capitalized subsequent to acquisition 15,769    
Gross amount carried at close of period      
Land and improvements 82,067    
Buildings and improvements 30,995    
Total 113,062    
Accumulated depreciation (20,791)    
Rental properties:      
Balance at the end of year 113,062    
Accumulated depreciation:      
Balance at the end of year 20,791    
Real Estate Rental Property      
Gross amount carried at close of period      
Total 16,135,223 15,966,227 15,629,927
Rental properties:      
Balance at beginning of year 15,966,227 15,629,927 15,061,745
Balance at the end of year $ 16,135,223 $ 15,966,227 $ 15,629,927