SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) apartment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) ft²
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance				$ 1,806,626
Initial cost [Abstract]
Land				2,643,228
Buildings and improvements				8,881,303
Costs capitalized subsequent to acquisition				1,841,570
Gross amount carried at close of period [Abstract]
Land and improvements				2,701,356
Buildings and improvements				10,664,745
Total	$ 13,366,101			13,366,101
Accumulated depreciation	(2,769,297)	$ (2,311,546)	$ (1,949,892)	(3,209,548)
Aggregate cost for federal income tax purpose	10,300,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Acquisition, development, and improvement of real estate	325,986	700,892	609,669
Disposition of real estate and other	(321,958)	(28,367)	(264,832)
Reclassification from other assets and into building and improvements, net	0	1,826	4,756
Balance at the end of year	13,366,101
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,769,297	2,311,546	1,949,892
Depreciation expense	478,721	464,043	432,165
Depreciation expense - Disposals and other	(38,470)	(6,292)	(70,511)
Balance at the end of year	3,209,548	2,769,297	2,311,546
Marquis [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance				45,800
Gross amount carried at close of period [Abstract]
Total	71,000			71,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 71,000
Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	13,456
Encumbrance				1,806,626
Initial cost [Abstract]
Land				716,537
Buildings and improvements				2,264,308
Costs capitalized subsequent to acquisition				478,675
Gross amount carried at close of period [Abstract]
Land and improvements				726,494
Buildings and improvements				2,733,026
Total	$ 3,459,520			3,459,520
Accumulated depreciation	(865,715)			(865,715)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	3,459,520
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 865,715
Encumbered Apartment Communities [Member] | Avondale at Warner Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	446
Encumbrance				41,945
Initial cost [Abstract]
Land				10,536
Buildings and improvements				24,522
Costs capitalized subsequent to acquisition				22,604
Gross amount carried at close of period [Abstract]
Land and improvements				10,601
Buildings and improvements				47,061
Total	$ 57,662			57,662
Accumulated depreciation	$ (32,368)			(32,368)
Date of construction	1970
Date acquired	Jan-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 57,662
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 32,368
Encumbered Apartment Communities [Member] | Avondale at Warner Center [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Avondale at Warner Center [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Bel Air [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	462
Encumbrance				49,185
Initial cost [Abstract]
Land				12,105
Buildings and improvements				18,252
Costs capitalized subsequent to acquisition				37,550
Gross amount carried at close of period [Abstract]
Land and improvements				12,682
Buildings and improvements				55,225
Total	$ 67,907			67,907
Accumulated depreciation	$ (37,019)			(37,019)
Date of construction	1988
Date acquired	Jan-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 67,907
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 37,019
Encumbered Apartment Communities [Member] | Bel Air [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Bel Air [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Belcarra [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	296
Encumbrance				48,602
Initial cost [Abstract]
Land				21,725
Buildings and improvements				92,091
Costs capitalized subsequent to acquisition				1,985
Gross amount carried at close of period [Abstract]
Land and improvements				21,725
Buildings and improvements				94,076
Total	$ 115,801			115,801
Accumulated depreciation	$ (16,327)			(16,327)
Date of construction	2009
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 115,801
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,327
Encumbered Apartment Communities [Member] | Belcarra [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Belcarra [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | BellCentre [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	248
Encumbrance				36,617
Initial cost [Abstract]
Land				16,197
Buildings and improvements				67,207
Costs capitalized subsequent to acquisition				3,843
Gross amount carried at close of period [Abstract]
Land and improvements				16,197
Buildings and improvements				71,050
Total	$ 87,247			87,247
Accumulated depreciation	$ (13,018)			(13,018)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 87,247
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,018
Encumbered Apartment Communities [Member] | BellCentre [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | BellCentre [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Belmont Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	275
Encumbrance				29,678
Initial cost [Abstract]
Land				8,100
Buildings and improvements				66,666
Costs capitalized subsequent to acquisition				6,379
Gross amount carried at close of period [Abstract]
Land and improvements				8,267
Buildings and improvements				72,878
Total	$ 81,145			81,145
Accumulated depreciation	$ (28,705)			(28,705)
Date of construction	2009
Date acquired	Mar-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 81,145
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 28,705
Encumbered Apartment Communities [Member] | Belmont Station [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Belmont Station [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Brookside Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	170
Encumbrance				17,746
Initial cost [Abstract]
Land				7,301
Buildings and improvements				16,310
Costs capitalized subsequent to acquisition				26,653
Gross amount carried at close of period [Abstract]
Land and improvements				10,328
Buildings and improvements				39,936
Total	$ 50,264			50,264
Accumulated depreciation	$ (22,529)			(22,529)
Date of construction	1973
Date acquired	Jun-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,264
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 22,529
Encumbered Apartment Communities [Member] | Brookside Oaks [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Brookside Oaks [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Carmel Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	348
Encumbrance				58,875
Initial cost [Abstract]
Land				26,842
Buildings and improvements				107,368
Costs capitalized subsequent to acquisition				6,069
Gross amount carried at close of period [Abstract]
Land and improvements				26,842
Buildings and improvements				113,437
Total	$ 140,279			140,279
Accumulated depreciation	$ (21,010)			(21,010)
Date of construction	2000
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 140,279
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 21,010
Encumbered Apartment Communities [Member] | Carmel Creek [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Carmel Creek [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | City View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	572
Encumbrance				62,544
Initial cost [Abstract]
Land				9,883
Buildings and improvements				37,670
Costs capitalized subsequent to acquisition				29,252
Gross amount carried at close of period [Abstract]
Land and improvements				10,350
Buildings and improvements				66,455
Total	$ 76,805			76,805
Accumulated depreciation	$ (47,198)			(47,198)
Date of construction	1975
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 76,805
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 47,198
Encumbered Apartment Communities [Member] | City View [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | City View [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Courtyard off Main [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	110
Encumbrance				14,542
Initial cost [Abstract]
Land				7,465
Buildings and improvements				21,405
Costs capitalized subsequent to acquisition				3,999
Gross amount carried at close of period [Abstract]
Land and improvements				7,465
Buildings and improvements				25,404
Total	$ 32,869			32,869
Accumulated depreciation	$ (7,768)			(7,768)
Date of construction	2000
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,869
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,768
Encumbered Apartment Communities [Member] | Courtyard off Main [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Courtyard off Main [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Domaine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	92
Encumbrance				13,446
Initial cost [Abstract]
Land				9,059
Buildings and improvements				27,177
Costs capitalized subsequent to acquisition				1,173
Gross amount carried at close of period [Abstract]
Land and improvements				9,059
Buildings and improvements				28,350
Total	$ 37,409			37,409
Accumulated depreciation	$ (6,238)			(6,238)
Date of construction	2009
Date acquired	Sep-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 37,409
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,238
Encumbered Apartment Communities [Member] | Domaine [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Domaine [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Elevation [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	158
Encumbrance				10,103
Initial cost [Abstract]
Land				4,758
Buildings and improvements				14,285
Costs capitalized subsequent to acquisition				6,968
Gross amount carried at close of period [Abstract]
Land and improvements				4,757
Buildings and improvements				21,254
Total	$ 26,011			26,011
Accumulated depreciation	$ (8,650)			(8,650)
Date of construction	1986
Date acquired	Jun-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,011
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,650
Encumbered Apartment Communities [Member] | Elevation [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Elevation [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Fairhaven Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	164
Encumbrance				18,078
Initial cost [Abstract]
Land				2,626
Buildings and improvements				10,485
Costs capitalized subsequent to acquisition				8,847
Gross amount carried at close of period [Abstract]
Land and improvements				2,957
Buildings and improvements				19,001
Total	$ 21,958			21,958
Accumulated depreciation	$ (10,794)			(10,794)
Date of construction	1970
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 21,958
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,794
Encumbered Apartment Communities [Member] | Fairhaven Apartments [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Fairhaven Apartments [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Form 15 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	242
Encumbrance				44,922
Initial cost [Abstract]
Land				24,510
Buildings and improvements				72,221
Costs capitalized subsequent to acquisition				5,236
Gross amount carried at close of period [Abstract]
Land and improvements				25,540
Buildings and improvements				76,427
Total	$ 101,967			101,967
Accumulated depreciation	$ (7,633)			(7,633)
Date of construction	2014
Date acquired	Mar-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 101,967
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,633
Encumbered Apartment Communities [Member] | Form 15 [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Form 15 [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Foster's Landing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	490
Encumbrance				90,117
Initial cost [Abstract]
Land				61,714
Buildings and improvements				144,000
Costs capitalized subsequent to acquisition				9,004
Gross amount carried at close of period [Abstract]
Land and improvements				61,714
Buildings and improvements				153,004
Total	$ 214,718			214,718
Accumulated depreciation	$ (28,842)			(28,842)
Date of construction	1987
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 214,718
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 28,842
Encumbered Apartment Communities [Member] | Foster's Landing [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Foster's Landing [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Fountain At Riveroaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	226
Encumbrance				29,974
Initial cost [Abstract]
Land				26,046
Buildings and improvements				60,773
Costs capitalized subsequent to acquisition				4,234
Gross amount carried at close of period [Abstract]
Land and improvements				26,046
Buildings and improvements				65,007
Total	$ 91,053			91,053
Accumulated depreciation	$ (11,960)			(11,960)
Date of construction	1990
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 91,053
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,960
Encumbered Apartment Communities [Member] | Fountain At Riveroaks [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Fountain At Riveroaks [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Fountain Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	705
Encumbrance				82,571
Initial cost [Abstract]
Land				25,073
Buildings and improvements				94,980
Costs capitalized subsequent to acquisition				33,057
Gross amount carried at close of period [Abstract]
Land and improvements				25,203
Buildings and improvements				127,907
Total	$ 153,110			153,110
Accumulated depreciation	$ (70,823)			(70,823)
Date of construction	2002
Date acquired	Feb-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 153,110
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 70,823
Encumbered Apartment Communities [Member] | Fountain Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Fountain Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Hidden Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	324
Encumbrance				29,360
Initial cost [Abstract]
Land				14,174
Buildings and improvements				34,065
Costs capitalized subsequent to acquisition				6,184
Gross amount carried at close of period [Abstract]
Land and improvements				9,674
Buildings and improvements				44,749
Total	$ 54,423			54,423
Accumulated depreciation	$ (21,000)			(21,000)
Date of construction	2004
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 54,423
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 21,000
Encumbered Apartment Communities [Member] | Hidden Valley [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Hidden Valley [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Highlands at Wynhaven [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	333
Encumbrance				29,540
Initial cost [Abstract]
Land				16,271
Buildings and improvements				48,932
Costs capitalized subsequent to acquisition				13,850
Gross amount carried at close of period [Abstract]
Land and improvements				16,271
Buildings and improvements				62,782
Total	$ 79,053			79,053
Accumulated depreciation	$ (24,572)			(24,572)
Date of construction	2000
Date acquired	Aug-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 79,053
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 24,572
Encumbered Apartment Communities [Member] | Highlands at Wynhaven [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Highlands at Wynhaven [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Highridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	255
Encumbrance				69,273
Initial cost [Abstract]
Land				5,419
Buildings and improvements				18,347
Costs capitalized subsequent to acquisition				31,535
Gross amount carried at close of period [Abstract]
Land and improvements				6,073
Buildings and improvements				49,228
Total	$ 55,301			55,301
Accumulated depreciation	$ (36,693)			(36,693)
Date of construction	1972
Date acquired	May-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 55,301
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 36,693
Encumbered Apartment Communities [Member] | Highridge [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Highridge [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Hillcrest Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	608
Encumbrance				61,279
Initial cost [Abstract]
Land				15,318
Buildings and improvements				40,601
Costs capitalized subsequent to acquisition				20,434
Gross amount carried at close of period [Abstract]
Land and improvements				15,755
Buildings and improvements				60,598
Total	$ 76,353			76,353
Accumulated depreciation	$ (39,954)			(39,954)
Date of construction	1973
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 76,353
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 39,954
Encumbered Apartment Communities [Member] | Hillcrest Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Hillcrest Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Huntington Breakers [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	342
Encumbrance				34,397
Initial cost [Abstract]
Land				9,306
Buildings and improvements				22,720
Costs capitalized subsequent to acquisition				20,818
Gross amount carried at close of period [Abstract]
Land and improvements				9,315
Buildings and improvements				43,529
Total	$ 52,844			52,844
Accumulated depreciation	$ (29,374)			(29,374)
Date of construction	1984
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 52,844
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 29,374
Encumbered Apartment Communities [Member] | Huntington Breakers [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Huntington Breakers [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Inglenook Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	224
Encumbrance				8,238
Initial cost [Abstract]
Land				3,467
Buildings and improvements				7,881
Costs capitalized subsequent to acquisition				7,771
Gross amount carried at close of period [Abstract]
Land and improvements				3,474
Buildings and improvements				15,645
Total	$ 19,119			19,119
Accumulated depreciation	$ (12,667)			(12,667)
Date of construction	1985
Date acquired	Oct-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,119
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,667
Encumbered Apartment Communities [Member] | Inglenook Court [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Inglenook Court [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | 1000 Kiely [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	121
Encumbrance				34,040
Initial cost [Abstract]
Land				9,359
Buildings and improvements				21,845
Costs capitalized subsequent to acquisition				7,956
Gross amount carried at close of period [Abstract]
Land and improvements				9,359
Buildings and improvements				29,801
Total	$ 39,160			39,160
Accumulated depreciation	$ (10,654)			(10,654)
Date of construction	1971
Date acquired	Mar-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 39,160
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,654
Encumbered Apartment Communities [Member] | 1000 Kiely [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | 1000 Kiely [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Magnolia Square/Magnolia Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	188
Encumbrance				52,237
Initial cost [Abstract]
Land				8,190
Buildings and improvements				24,736
Costs capitalized subsequent to acquisition				17,531
Gross amount carried at close of period [Abstract]
Land and improvements				8,191
Buildings and improvements				42,266
Total	$ 50,457			50,457
Accumulated depreciation	$ (20,951)			(20,951)
Date of construction	1963
Date acquired	Sep-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,457
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 20,951
Encumbered Apartment Communities [Member] | Magnolia Square/Magnolia Lane [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Magnolia Square/Magnolia Lane [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Marquis [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	166
Encumbrance				43,467
Initial cost [Abstract]
Land				20,495
Buildings and improvements				47,823
Costs capitalized subsequent to acquisition				117
Gross amount carried at close of period [Abstract]
Land and improvements				20,495
Buildings and improvements				47,940
Total	$ 68,435			68,435
Accumulated depreciation	$ (151)			(151)
Date of construction	2015
Date acquired	Dec-18
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 68,435
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 151
Encumbered Apartment Communities [Member] | Marquis [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Marquis [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montarosa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	472
Encumbrance				60,473
Initial cost [Abstract]
Land				26,697
Buildings and improvements				106,787
Costs capitalized subsequent to acquisition				5,447
Gross amount carried at close of period [Abstract]
Land and improvements				26,697
Buildings and improvements				112,234
Total	$ 138,931			138,931
Accumulated depreciation	$ (20,206)			(20,206)
Date of construction	1990
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 138,931
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 20,206
Encumbered Apartment Communities [Member] | Montarosa [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Montarosa [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montebello [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	248
Encumbrance				24,639
Initial cost [Abstract]
Land				13,857
Buildings and improvements				41,575
Costs capitalized subsequent to acquisition				4,955
Gross amount carried at close of period [Abstract]
Land and improvements				13,858
Buildings and improvements				46,529
Total	$ 60,387			60,387
Accumulated depreciation	$ (11,718)			(11,718)
Date of construction	1996
Date acquired	Jul-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 60,387
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,718
Encumbered Apartment Communities [Member] | Montebello [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Montebello [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montejo Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	124
Encumbrance				12,873
Initial cost [Abstract]
Land				1,925
Buildings and improvements				7,685
Costs capitalized subsequent to acquisition				3,972
Gross amount carried at close of period [Abstract]
Land and improvements				2,194
Buildings and improvements				11,388
Total	$ 13,582			13,582
Accumulated depreciation	$ (6,436)			(6,436)
Date of construction	1974
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 13,582
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,436
Encumbered Apartment Communities [Member] | Montejo Apartments [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Montejo Apartments [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Park Highland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	250
Encumbrance				25,127
Initial cost [Abstract]
Land				9,391
Buildings and improvements				38,224
Costs capitalized subsequent to acquisition				12,255
Gross amount carried at close of period [Abstract]
Land and improvements				9,391
Buildings and improvements				50,479
Total	$ 59,870			59,870
Accumulated depreciation	$ (10,986)			(10,986)
Date of construction	1993
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 59,870
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,986
Encumbered Apartment Communities [Member] | Park Highland [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Park Highland [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pinnacle at Fullerton [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	192
Encumbrance				25,320
Initial cost [Abstract]
Land				11,019
Buildings and improvements				45,932
Costs capitalized subsequent to acquisition				3,377
Gross amount carried at close of period [Abstract]
Land and improvements				11,019
Buildings and improvements				49,309
Total	$ 60,328			60,328
Accumulated depreciation	$ (9,000)			(9,000)
Date of construction	2004
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 60,328
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,000
Encumbered Apartment Communities [Member] | Pinnacle at Fullerton [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Pinnacle at Fullerton [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pinnacle on Lake Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	180
Encumbrance				17,499
Initial cost [Abstract]
Land				7,760
Buildings and improvements				31,041
Costs capitalized subsequent to acquisition				2,893
Gross amount carried at close of period [Abstract]
Land and improvements				7,760
Buildings and improvements				33,934
Total	$ 41,694			41,694
Accumulated depreciation	$ (5,993)			(5,993)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 41,694
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,993
Encumbered Apartment Communities [Member] | Pinnacle on Lake Washington [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Pinnacle on Lake Washington [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pinnacle at MacArthur Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	253
Encumbrance				36,478
Initial cost [Abstract]
Land				15,810
Buildings and improvements				66,401
Costs capitalized subsequent to acquisition				4,703
Gross amount carried at close of period [Abstract]
Land and improvements				15,810
Buildings and improvements				71,104
Total	$ 86,914			86,914
Accumulated depreciation	$ (12,752)			(12,752)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 86,914
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,752
Encumbered Apartment Communities [Member] | Pinnacle at MacArthur Place [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Pinnacle at MacArthur Place [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pinnacle at Otay Ranch I & II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	364
Encumbrance				37,272
Initial cost [Abstract]
Land				17,023
Buildings and improvements				68,093
Costs capitalized subsequent to acquisition				3,691
Gross amount carried at close of period [Abstract]
Land and improvements				17,023
Buildings and improvements				71,784
Total	$ 88,807			88,807
Accumulated depreciation	$ (13,000)			(13,000)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 88,807
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,000
Encumbered Apartment Communities [Member] | Pinnacle at Otay Ranch I & II [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Pinnacle at Otay Ranch I & II [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pinnacle at Talega [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	362
Encumbrance				41,647
Initial cost [Abstract]
Land				19,292
Buildings and improvements				77,168
Costs capitalized subsequent to acquisition				2,771
Gross amount carried at close of period [Abstract]
Land and improvements				19,292
Buildings and improvements				79,939
Total	$ 99,231			99,231
Accumulated depreciation	$ (14,268)			(14,268)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 99,231
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,268
Encumbered Apartment Communities [Member] | Pinnacle at Talega [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Pinnacle at Talega [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Sage At Cupertino [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	230
Encumbrance				51,690
Initial cost [Abstract]
Land				35,719
Buildings and improvements				53,449
Costs capitalized subsequent to acquisition				3,467
Gross amount carried at close of period [Abstract]
Land and improvements				35,719
Buildings and improvements				56,916
Total	$ 92,635			92,635
Accumulated depreciation	$ (3,689)			(3,689)
Date of construction	1971
Date acquired	Mar-17
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 92,635
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 3,689
Encumbered Apartment Communities [Member] | Sage At Cupertino [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Sage At Cupertino [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Stevenson Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	200
Encumbrance				19,840
Initial cost [Abstract]
Land				996
Buildings and improvements				5,582
Costs capitalized subsequent to acquisition				12,827
Gross amount carried at close of period [Abstract]
Land and improvements				1,001
Buildings and improvements				18,404
Total	$ 19,405			19,405
Accumulated depreciation	$ (13,221)			(13,221)
Date of construction	1975
Date acquired	Apr-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,405
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,221
Encumbered Apartment Communities [Member] | Stevenson Place [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Stevenson Place [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Summerhill Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	100
Encumbrance				12,269
Initial cost [Abstract]
Land				2,654
Buildings and improvements				4,918
Costs capitalized subsequent to acquisition				11,132
Gross amount carried at close of period [Abstract]
Land and improvements				2,656
Buildings and improvements				16,048
Total	$ 18,704			18,704
Accumulated depreciation	$ (10,309)			(10,309)
Date of construction	1988
Date acquired	Sep-88
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 18,704
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,309
Encumbered Apartment Communities [Member] | Summerhill Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Summerhill Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Audrey at Belltown [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	137
Encumbrance				19,767
Initial cost [Abstract]
Land				9,228
Buildings and improvements				36,911
Costs capitalized subsequent to acquisition				958
Gross amount carried at close of period [Abstract]
Land and improvements				9,228
Buildings and improvements				37,869
Total	$ 47,097			47,097
Accumulated depreciation	$ (6,618)			(6,618)
Date of construction	1992
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,097
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,618
Encumbered Apartment Communities [Member] | The Audrey at Belltown [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | The Audrey at Belltown [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Barkley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	161
Encumbrance				14,843
Initial cost [Abstract]
Land				0
Buildings and improvements				8,520
Costs capitalized subsequent to acquisition				7,001
Gross amount carried at close of period [Abstract]
Land and improvements				2,353
Buildings and improvements				13,168
Total	$ 15,521			15,521
Accumulated depreciation	$ (8,354)			(8,354)
Date of construction	1984
Date acquired	Apr-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,521
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,354
Encumbered Apartment Communities [Member] | The Barkley [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Barkley [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Dylan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	184
Encumbrance				59,163
Initial cost [Abstract]
Land				19,984
Buildings and improvements				82,286
Costs capitalized subsequent to acquisition				834
Gross amount carried at close of period [Abstract]
Land and improvements				19,990
Buildings and improvements				83,114
Total	$ 103,104			103,104
Accumulated depreciation	$ (12,396)			(12,396)
Date of construction	2015
Date acquired	Mar-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 103,104
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,396
Encumbered Apartment Communities [Member] | The Dylan [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Dylan [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Huntington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	276
Encumbrance				27,707
Initial cost [Abstract]
Land				10,374
Buildings and improvements				41,495
Costs capitalized subsequent to acquisition				5,028
Gross amount carried at close of period [Abstract]
Land and improvements				10,374
Buildings and improvements				46,523
Total	$ 56,897			56,897
Accumulated depreciation	$ (11,692)			(11,692)
Date of construction	1975
Date acquired	Jun-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 56,897
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,692
Encumbered Apartment Communities [Member] | The Huntington [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Huntington [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Huxley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	187
Encumbrance				53,874
Initial cost [Abstract]
Land				19,362
Buildings and improvements				75,641
Costs capitalized subsequent to acquisition				1,321
Gross amount carried at close of period [Abstract]
Land and improvements				19,371
Buildings and improvements				76,953
Total	$ 96,324			96,324
Accumulated depreciation	$ (11,748)			(11,748)
Date of construction	2014
Date acquired	Mar-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 96,324
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,748
Encumbered Apartment Communities [Member] | The Huxley [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Huxley [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Landing at Jack London Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	282
Encumbrance				49,421
Initial cost [Abstract]
Land				33,554
Buildings and improvements				78,292
Costs capitalized subsequent to acquisition				5,908
Gross amount carried at close of period [Abstract]
Land and improvements				33,554
Buildings and improvements				84,200
Total	$ 117,754			117,754
Accumulated depreciation	$ (16,132)			(16,132)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 117,754
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,132
Encumbered Apartment Communities [Member] | The Landing at Jack London Square [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | The Landing at Jack London Square [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Palms at Laguna Niguel [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	460
Encumbrance				52,887
Initial cost [Abstract]
Land				23,584
Buildings and improvements				94,334
Costs capitalized subsequent to acquisition				8,094
Gross amount carried at close of period [Abstract]
Land and improvements				23,584
Buildings and improvements				102,428
Total	$ 126,012			126,012
Accumulated depreciation	$ (18,599)			(18,599)
Date of construction	1988
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 126,012
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 18,599
Encumbered Apartment Communities [Member] | The Palms at Laguna Niguel [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | The Palms at Laguna Niguel [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Waterford [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	238
Encumbrance				29,252
Initial cost [Abstract]
Land				11,808
Buildings and improvements				24,500
Costs capitalized subsequent to acquisition				15,956
Gross amount carried at close of period [Abstract]
Land and improvements				15,165
Buildings and improvements				37,099
Total	$ 52,264			52,264
Accumulated depreciation	$ (21,980)			(21,980)
Date of construction	2000
Date acquired	Jun-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 52,264
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 21,980
Encumbered Apartment Communities [Member] | The Waterford [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Waterford [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Valley Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	160
Encumbrance				20,875
Initial cost [Abstract]
Land				3,361
Buildings and improvements				13,420
Costs capitalized subsequent to acquisition				5,949
Gross amount carried at close of period [Abstract]
Land and improvements				3,761
Buildings and improvements				18,969
Total	$ 22,730			22,730
Accumulated depreciation	$ (10,761)			(10,761)
Date of construction	1969
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,730
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,761
Encumbered Apartment Communities [Member] | Valley Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Valley Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Villa Angelina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	256
Encumbrance				27,184
Initial cost [Abstract]
Land				4,498
Buildings and improvements				17,962
Costs capitalized subsequent to acquisition				7,398
Gross amount carried at close of period [Abstract]
Land and improvements				4,962
Buildings and improvements				24,896
Total	$ 29,858			29,858
Accumulated depreciation	$ (14,497)			(14,497)
Date of construction	1970
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,858
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,497
Encumbered Apartment Communities [Member] | Villa Angelina [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Villa Angelina [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Villa Grenada [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	270
Encumbrance				54,307
Initial cost [Abstract]
Land				38,299
Buildings and improvements				89,365
Costs capitalized subsequent to acquisition				1,732
Gross amount carried at close of period [Abstract]
Land and improvements				38,299
Buildings and improvements				91,097
Total	$ 129,396			129,396
Accumulated depreciation	$ (16,216)			(16,216)
Date of construction	2010
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 129,396
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,216
Encumbered Apartment Communities [Member] | Villa Grenada [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Villa Grenada [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Wandering Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	156
Encumbrance				5,254
Initial cost [Abstract]
Land				1,285
Buildings and improvements				4,980
Costs capitalized subsequent to acquisition				4,833
Gross amount carried at close of period [Abstract]
Land and improvements				1,296
Buildings and improvements				9,802
Total	$ 11,098			11,098
Accumulated depreciation	$ (7,521)			(7,521)
Date of construction	1986
Date acquired	Nov-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 11,098
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,521
Encumbered Apartment Communities [Member] | Wandering Creek [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Wandering Creek [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Wilshire Promenade [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	149
Encumbrance				16,189
Initial cost [Abstract]
Land				3,118
Buildings and improvements				7,385
Costs capitalized subsequent to acquisition				9,124
Gross amount carried at close of period [Abstract]
Land and improvements				3,797
Buildings and improvements				15,830
Total	$ 19,627			19,627
Accumulated depreciation	$ (10,725)			(10,725)
Date of construction	1992
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,627
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,725
Encumbered Apartment Communities [Member] | Wilshire Promenade [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Wilshire Promenade [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Ellington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	220
Initial cost [Abstract]
Land				15,066
Buildings and improvements				45,249
Costs capitalized subsequent to acquisition				3,535
Gross amount carried at close of period [Abstract]
Land and improvements				15,066
Buildings and improvements				48,784
Total	$ 63,850			63,850
Accumulated depreciation	$ (7,810)			(7,810)
Date of construction	1994
Date acquired	Jul-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 63,850
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,810
Encumbered Apartment Communities [Member] | The Palisades [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Palisades [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	35,592
Initial cost [Abstract]
Land				1,923,612
Buildings and improvements				6,604,680
Costs capitalized subsequent to acquisition				1,352,987
Gross amount carried at close of period [Abstract]
Land and improvements				1,970,554
Buildings and improvements				7,910,725
Total	$ 9,881,279			9,881,279
Accumulated depreciation	(2,329,714)			(2,329,714)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	9,881,279
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 2,329,714
Unencumbered Apartment Communities [Member] | Alessio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	624
Initial cost [Abstract]
Land				32,136
Buildings and improvements				128,543
Costs capitalized subsequent to acquisition				9,979
Gross amount carried at close of period [Abstract]
Land and improvements				32,136
Buildings and improvements				138,522
Total	$ 170,658			170,658
Accumulated depreciation	$ (25,383)			(25,383)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 170,658
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 25,383
Unencumbered Apartment Communities [Member] | Alessio [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Alessio [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Allegro [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	97
Initial cost [Abstract]
Land				5,869
Buildings and improvements				23,977
Costs capitalized subsequent to acquisition				2,304
Gross amount carried at close of period [Abstract]
Land and improvements				5,869
Buildings and improvements				26,281
Total	$ 32,150			32,150
Accumulated depreciation	$ (9,394)			(9,394)
Date of construction	2010
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,150
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,394
Unencumbered Apartment Communities [Member] | Allegro [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Allegro [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Allure at Scripps Ranch [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	194
Initial cost [Abstract]
Land				11,923
Buildings and improvements				47,690
Costs capitalized subsequent to acquisition				1,394
Gross amount carried at close of period [Abstract]
Land and improvements				11,923
Buildings and improvements				49,084
Total	$ 61,007			61,007
Accumulated depreciation	$ (8,699)			(8,699)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 61,007
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,699
Unencumbered Apartment Communities [Member] | Allure at Scripps Ranch [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Allure at Scripps Ranch [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Alpine Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	301
Initial cost [Abstract]
Land				4,967
Buildings and improvements				19,728
Costs capitalized subsequent to acquisition				8,602
Gross amount carried at close of period [Abstract]
Land and improvements				4,982
Buildings and improvements				28,315
Total	$ 33,297			33,297
Accumulated depreciation	$ (15,526)			(15,526)
Date of construction	1971
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 33,297
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 15,526
Unencumbered Apartment Communities [Member] | Alpine Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Alpine Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Anavia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	250
Initial cost [Abstract]
Land				15,925
Buildings and improvements				63,712
Costs capitalized subsequent to acquisition				7,985
Gross amount carried at close of period [Abstract]
Land and improvements				15,925
Buildings and improvements				71,697
Total	$ 87,622			87,622
Accumulated depreciation	$ (19,857)			(19,857)
Date of construction	2009
Date acquired	Dec-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 87,622
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 19,857
Unencumbered Apartment Communities [Member] | Anavia [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Anavia [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Annaliese [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	56
Initial cost [Abstract]
Land				4,727
Buildings and improvements				14,229
Costs capitalized subsequent to acquisition				613
Gross amount carried at close of period [Abstract]
Land and improvements				4,726
Buildings and improvements				14,843
Total	$ 19,569			19,569
Accumulated depreciation	$ (3,047)			(3,047)
Date of construction	2009
Date acquired	Jan-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,569
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 3,047
Unencumbered Apartment Communities [Member] | Annaliese [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Annaliese [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Apex [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	366
Initial cost [Abstract]
Land				44,240
Buildings and improvements				103,251
Costs capitalized subsequent to acquisition				3,321
Gross amount carried at close of period [Abstract]
Land and improvements				44,240
Buildings and improvements				106,572
Total	$ 150,812			150,812
Accumulated depreciation	$ (15,479)			(15,479)
Date of construction	2014
Date acquired	Aug-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 150,812
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 15,479
Unencumbered Apartment Communities [Member] | Apex [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Apex [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Aqua at Marina Del Rey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	500
Initial cost [Abstract]
Land				58,442
Buildings and improvements				175,326
Costs capitalized subsequent to acquisition				13,232
Gross amount carried at close of period [Abstract]
Land and improvements				58,442
Buildings and improvements				188,558
Total	$ 247,000			247,000
Accumulated depreciation	$ (35,960)			(35,960)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 247,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 35,960
Unencumbered Apartment Communities [Member] | Aqua at Marina Del Rey [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Aqua at Marina Del Rey [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Ascent [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	90
Initial cost [Abstract]
Land				3,924
Buildings and improvements				11,862
Costs capitalized subsequent to acquisition				2,014
Gross amount carried at close of period [Abstract]
Land and improvements				3,924
Buildings and improvements				13,876
Total	$ 17,800			17,800
Accumulated depreciation	$ (3,547)			(3,547)
Date of construction	1988
Date acquired	Oct-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,800
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 3,547
Unencumbered Apartment Communities [Member] | Ascent [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Ascent [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Ashton Sherman Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	264
Initial cost [Abstract]
Land				23,550
Buildings and improvements				93,811
Costs capitalized subsequent to acquisition				489
Gross amount carried at close of period [Abstract]
Land and improvements				23,550
Buildings and improvements				94,300
Total	$ 117,850			117,850
Accumulated depreciation	$ (6,777)			(6,777)
Date of construction	2014
Date acquired	Dec-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 117,850
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,777
Unencumbered Apartment Communities [Member] | Ashton Sherman Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Ashton Sherman Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Avant [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	440
Initial cost [Abstract]
Land				32,379
Buildings and improvements				137,940
Costs capitalized subsequent to acquisition				1,949
Gross amount carried at close of period [Abstract]
Land and improvements				32,379
Buildings and improvements				139,889
Total	$ 172,268			172,268
Accumulated depreciation	$ (16,452)			(16,452)
Date of construction	2014
Date acquired	Jun-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 172,268
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,452
Unencumbered Apartment Communities [Member] | Avant [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Avant [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Avenue 64 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	224
Initial cost [Abstract]
Land				27,235
Buildings and improvements				64,403
Costs capitalized subsequent to acquisition				14,377
Gross amount carried at close of period [Abstract]
Land and improvements				27,235
Buildings and improvements				78,780
Total	$ 106,015			106,015
Accumulated depreciation	$ (13,015)			(13,015)
Date of construction	2007
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 106,015
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,015
Unencumbered Apartment Communities [Member] | Avenue 64 [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Avenue 64 [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Aviara [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	166
Initial cost [Abstract]
Land				0
Buildings and improvements				49,813
Costs capitalized subsequent to acquisition				1,063
Gross amount carried at close of period [Abstract]
Land and improvements				0
Buildings and improvements				50,876
Total	$ 50,876			50,876
Accumulated depreciation	$ (9,998)			(9,998)
Date of construction	2013
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,876
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,998
Unencumbered Apartment Communities [Member] | Aviara [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Aviara [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Axis 2300 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	115
Initial cost [Abstract]
Land				5,405
Buildings and improvements				33,585
Costs capitalized subsequent to acquisition				1,674
Gross amount carried at close of period [Abstract]
Land and improvements				5,405
Buildings and improvements				35,259
Total	$ 40,664			40,664
Accumulated depreciation	$ (12,341)			(12,341)
Date of construction	2010
Date acquired	Aug-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 40,664
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,341
Unencumbered Apartment Communities [Member] | Axis 2300 [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Axis 2300 [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bella Villagio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	231
Initial cost [Abstract]
Land				17,247
Buildings and improvements				40,343
Costs capitalized subsequent to acquisition				3,540
Gross amount carried at close of period [Abstract]
Land and improvements				17,247
Buildings and improvements				43,883
Total	$ 61,130			61,130
Accumulated depreciation	$ (13,122)			(13,122)
Date of construction	2004
Date acquired	Sep-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 61,130
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,122
Unencumbered Apartment Communities [Member] | Bella Villagio [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bella Villagio [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bellerive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	63
Initial cost [Abstract]
Land				5,401
Buildings and improvements				21,803
Costs capitalized subsequent to acquisition				1,189
Gross amount carried at close of period [Abstract]
Land and improvements				5,401
Buildings and improvements				22,992
Total	$ 28,393			28,393
Accumulated depreciation	$ (6,962)			(6,962)
Date of construction	2011
Date acquired	Aug-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 28,393
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,962
Unencumbered Apartment Communities [Member] | Bellerive [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bellerive [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Belmont Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	71
Initial cost [Abstract]
Land				4,446
Buildings and improvements				10,290
Costs capitalized subsequent to acquisition				6,946
Gross amount carried at close of period [Abstract]
Land and improvements				4,473
Buildings and improvements				17,209
Total	$ 21,682			21,682
Accumulated depreciation	$ (8,257)			(8,257)
Date of construction	1974
Date acquired	Oct-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 21,682
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,257
Unencumbered Apartment Communities [Member] | Belmont Terrace [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Belmont Terrace [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bennett Lofts [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	165
Initial cost [Abstract]
Land				21,771
Buildings and improvements				50,800
Costs capitalized subsequent to acquisition				29,672
Gross amount carried at close of period [Abstract]
Land and improvements				28,371
Buildings and improvements				73,872
Total	$ 102,243			102,243
Accumulated depreciation	$ (16,319)			(16,319)
Date of construction	2004
Date acquired	Dec-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 102,243
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,319
Unencumbered Apartment Communities [Member] | Bennett Lofts [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bennett Lofts [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bernardo Crest [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	216
Initial cost [Abstract]
Land				10,802
Buildings and improvements				43,209
Costs capitalized subsequent to acquisition				3,665
Gross amount carried at close of period [Abstract]
Land and improvements				10,802
Buildings and improvements				46,874
Total	$ 57,676			57,676
Accumulated depreciation	$ (8,539)			(8,539)
Date of construction	1988
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 57,676
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,539
Unencumbered Apartment Communities [Member] | Bernardo Crest [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Bernardo Crest [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bonita Cedars [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	120
Initial cost [Abstract]
Land				2,496
Buildings and improvements				9,913
Costs capitalized subsequent to acquisition				5,160
Gross amount carried at close of period [Abstract]
Land and improvements				2,503
Buildings and improvements				15,066
Total	$ 17,569			17,569
Accumulated depreciation	$ (7,598)			(7,598)
Date of construction	1983
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,569
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,598
Unencumbered Apartment Communities [Member] | Bonita Cedars [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bonita Cedars [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	172
Initial cost [Abstract]
Land				3,520
Buildings and improvements				8,182
Costs capitalized subsequent to acquisition				13,860
Gross amount carried at close of period [Abstract]
Land and improvements				3,580
Buildings and improvements				21,982
Total	$ 25,562			25,562
Accumulated depreciation	$ (17,002)			(17,002)
Date of construction	1978
Date acquired	Jan-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,562
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 17,002
Unencumbered Apartment Communities [Member] | Boulevard [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Boulevard [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bridle Trails [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	108
Initial cost [Abstract]
Land				1,500
Buildings and improvements				5,930
Costs capitalized subsequent to acquisition				6,154
Gross amount carried at close of period [Abstract]
Land and improvements				1,531
Buildings and improvements				12,053
Total	$ 13,584			13,584
Accumulated depreciation	$ (8,499)			(8,499)
Date of construction	1986
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 13,584
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,499
Unencumbered Apartment Communities [Member] | Bridle Trails [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bridle Trails [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Brighton Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	264
Initial cost [Abstract]
Land				2,623
Buildings and improvements				10,800
Costs capitalized subsequent to acquisition				5,486
Gross amount carried at close of period [Abstract]
Land and improvements				2,656
Buildings and improvements				16,253
Total	$ 18,909			18,909
Accumulated depreciation	$ (11,818)			(11,818)
Date of construction	1986
Date acquired	Dec-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 18,909
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,818
Unencumbered Apartment Communities [Member] | Brighton Ridge [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Brighton Ridge [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bristol Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	188
Initial cost [Abstract]
Land				5,278
Buildings and improvements				11,853
Costs capitalized subsequent to acquisition				9,272
Gross amount carried at close of period [Abstract]
Land and improvements				5,293
Buildings and improvements				21,110
Total	$ 26,403			26,403
Accumulated depreciation	$ (14,211)			(14,211)
Date of construction	1989
Date acquired	Jan-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,403
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,211
Unencumbered Apartment Communities [Member] | Bristol Commons [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bristol Commons [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | 416 on Broadway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	115
Initial cost [Abstract]
Land				8,557
Buildings and improvements				34,235
Costs capitalized subsequent to acquisition				2,973
Gross amount carried at close of period [Abstract]
Land and improvements				8,557
Buildings and improvements				37,208
Total	$ 45,765			45,765
Accumulated depreciation	$ (10,982)			(10,982)
Date of construction	2009
Date acquired	Dec-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 45,765
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,982
Unencumbered Apartment Communities [Member] | 416 on Broadway [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | 416 on Broadway [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bunker Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	456
Initial cost [Abstract]
Land				11,498
Buildings and improvements				27,871
Costs capitalized subsequent to acquisition				83,972
Gross amount carried at close of period [Abstract]
Land and improvements				11,639
Buildings and improvements				111,702
Total	$ 123,341			123,341
Accumulated depreciation	$ (54,527)			(54,527)
Date of construction	1968
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 123,341
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 54,527
Unencumbered Apartment Communities [Member] | Bunker Hill [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bunker Hill [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Camarillo Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	564
Initial cost [Abstract]
Land				10,953
Buildings and improvements				25,254
Costs capitalized subsequent to acquisition				7,791
Gross amount carried at close of period [Abstract]
Land and improvements				11,075
Buildings and improvements				32,923
Total	$ 43,998			43,998
Accumulated depreciation	$ (23,428)			(23,428)
Date of construction	1985
Date acquired	Jul-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 43,998
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 23,428
Unencumbered Apartment Communities [Member] | Camarillo Oaks [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Camarillo Oaks [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Cambridge Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	320
Initial cost [Abstract]
Land				18,185
Buildings and improvements				72,739
Costs capitalized subsequent to acquisition				2,974
Gross amount carried at close of period [Abstract]
Land and improvements				18,185
Buildings and improvements				75,713
Total	$ 93,898			93,898
Accumulated depreciation	$ (13,776)			(13,776)
Date of construction	1998
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 93,898
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,776
Unencumbered Apartment Communities [Member] | Cambridge Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Cambridge Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Camino Ruiz Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	159
Initial cost [Abstract]
Land				6,871
Buildings and improvements				26,119
Costs capitalized subsequent to acquisition				1,965
Gross amount carried at close of period [Abstract]
Land and improvements				6,931
Buildings and improvements				28,024
Total	$ 34,955			34,955
Accumulated depreciation	$ (11,628)			(11,628)
Date of construction	1990
Date acquired	Dec-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 34,955
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,628
Unencumbered Apartment Communities [Member] | Camino Ruiz Square [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Camino Ruiz Square [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Canyon Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	250
Initial cost [Abstract]
Land				19,088
Buildings and improvements				44,473
Costs capitalized subsequent to acquisition				4,232
Gross amount carried at close of period [Abstract]
Land and improvements				19,088
Buildings and improvements				48,705
Total	$ 67,793			67,793
Accumulated depreciation	$ (19,542)			(19,542)
Date of construction	2005
Date acquired	May-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 67,793
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 19,542
Unencumbered Apartment Communities [Member] | Canyon Oaks [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Canyon Oaks [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Canyon Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	250
Initial cost [Abstract]
Land				4,692
Buildings and improvements				18,288
Costs capitalized subsequent to acquisition				8,142
Gross amount carried at close of period [Abstract]
Land and improvements				4,693
Buildings and improvements				26,429
Total	$ 31,122			31,122
Accumulated depreciation	$ (14,475)			(14,475)
Date of construction	1990
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,122
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,475
Unencumbered Apartment Communities [Member] | Canyon Pointe [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Canyon Pointe [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Capri at Sunny Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	102
Initial cost [Abstract]
Land				3,337
Buildings and improvements				13,320
Costs capitalized subsequent to acquisition				9,319
Gross amount carried at close of period [Abstract]
Land and improvements				4,048
Buildings and improvements				21,928
Total	$ 25,976			25,976
Accumulated depreciation	$ (13,479)			(13,479)
Date of construction	1961
Date acquired	Sep-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,976
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,479
Unencumbered Apartment Communities [Member] | Capri at Sunny Hills [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Capri at Sunny Hills [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Carnel Landing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	356
Initial cost [Abstract]
Land				16,725
Buildings and improvements				66,901
Costs capitalized subsequent to acquisition				7,589
Gross amount carried at close of period [Abstract]
Land and improvements				16,725
Buildings and improvements				74,490
Total	$ 91,215			91,215
Accumulated depreciation	$ (13,639)			(13,639)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 91,215
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,639
Unencumbered Apartment Communities [Member] | Carnel Landing [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Carnel Landing [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Carnel Summit [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	246
Initial cost [Abstract]
Land				14,968
Buildings and improvements				59,871
Costs capitalized subsequent to acquisition				3,514
Gross amount carried at close of period [Abstract]
Land and improvements				14,968
Buildings and improvements				63,385
Total	$ 78,353			78,353
Accumulated depreciation	$ (11,342)			(11,342)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 78,353
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,342
Unencumbered Apartment Communities [Member] | Carnel Summit [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Carnel Summit [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Castle Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	216
Initial cost [Abstract]
Land				4,149
Buildings and improvements				16,028
Costs capitalized subsequent to acquisition				4,500
Gross amount carried at close of period [Abstract]
Land and improvements				4,833
Buildings and improvements				19,844
Total	$ 24,677			24,677
Accumulated depreciation	$ (13,953)			(13,953)
Date of construction	1998
Date acquired	Dec-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 24,677
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,953
Unencumbered Apartment Communities [Member] | Castle Creek [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Castle Creek [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Catalina Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	128
Initial cost [Abstract]
Land				6,714
Buildings and improvements				26,856
Costs capitalized subsequent to acquisition				1,485
Gross amount carried at close of period [Abstract]
Land and improvements				6,714
Buildings and improvements				28,341
Total	$ 35,055			35,055
Accumulated depreciation	$ (5,018)			(5,018)
Date of construction	1987
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 35,055
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,018
Unencumbered Apartment Communities [Member] | Catalina Gardens [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Catalina Gardens [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | CBC Apartments and The Sweeps [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	239
Initial cost [Abstract]
Land				11,841
Buildings and improvements				45,320
Costs capitalized subsequent to acquisition				6,556
Gross amount carried at close of period [Abstract]
Land and improvements				11,906
Buildings and improvements				51,811
Total	$ 63,717			63,717
Accumulated depreciation	$ (24,758)			(24,758)
Date of construction	1962
Date acquired	Jan-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 63,717
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 24,758
Unencumbered Apartment Communities [Member] | CBC Apartments and The Sweeps [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | CBC Apartments and The Sweeps [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Cedar Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	180
Initial cost [Abstract]
Land				5,543
Buildings and improvements				16,442
Costs capitalized subsequent to acquisition				7,214
Gross amount carried at close of period [Abstract]
Land and improvements				5,652
Buildings and improvements				23,547
Total	$ 29,199			29,199
Accumulated depreciation	$ (11,598)			(11,598)
Date of construction	1984
Date acquired	Jan-05
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,199
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,598
Unencumbered Apartment Communities [Member] | Cedar Terrace [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Cedar Terrace [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | CentrePointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	224
Initial cost [Abstract]
Land				3,405
Buildings and improvements				7,743
Costs capitalized subsequent to acquisition				21,354
Gross amount carried at close of period [Abstract]
Land and improvements				3,442
Buildings and improvements				29,060
Total	$ 32,502			32,502
Accumulated depreciation	$ (18,300)			(18,300)
Date of construction	1974
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,502
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 18,300
Unencumbered Apartment Communities [Member] | CentrePointe [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | CentrePointe [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Chestnut Street Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	96
Initial cost [Abstract]
Land				6,582
Buildings and improvements				15,689
Costs capitalized subsequent to acquisition				1,995
Gross amount carried at close of period [Abstract]
Land and improvements				6,582
Buildings and improvements				17,684
Total	$ 24,266			24,266
Accumulated depreciation	$ (6,512)			(6,512)
Date of construction	2002
Date acquired	Jul-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 24,266
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,512
Unencumbered Apartment Communities [Member] | Chestnut Street Apartments [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Chestnut Street Apartments [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Collins On Pine [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	76
Initial cost [Abstract]
Land				7,276
Buildings and improvements				22,226
Costs capitalized subsequent to acquisition				328
Gross amount carried at close of period [Abstract]
Land and improvements				7,276
Buildings and improvements				22,554
Total	$ 29,830			29,830
Accumulated depreciation	$ (3,520)			(3,520)
Date of construction	2013
Date acquired	May-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,830
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 3,520
Unencumbered Apartment Communities [Member] | Collins On Pine [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Collins On Pine [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Corbella at Juanita Bay [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	169
Initial cost [Abstract]
Land				5,801
Buildings and improvements				17,415
Costs capitalized subsequent to acquisition				3,165
Gross amount carried at close of period [Abstract]
Land and improvements				5,801
Buildings and improvements				20,580
Total	$ 26,381			26,381
Accumulated depreciation	$ (6,279)			(6,279)
Date of construction	1978
Date acquired	Nov-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,381
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,279
Unencumbered Apartment Communities [Member] | Corbella at Juanita Bay [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Corbella at Juanita Bay [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Cortesia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	308
Initial cost [Abstract]
Land				13,912
Buildings and improvements				55,649
Costs capitalized subsequent to acquisition				2,492
Gross amount carried at close of period [Abstract]
Land and improvements				13,912
Buildings and improvements				58,141
Total	$ 72,053			72,053
Accumulated depreciation	$ (10,430)			(10,430)
Date of construction	1999
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 72,053
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,430
Unencumbered Apartment Communities [Member] | Cortesia [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Cortesia [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Country Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	180
Initial cost [Abstract]
Land				4,174
Buildings and improvements				16,583
Costs capitalized subsequent to acquisition				5,074
Gross amount carried at close of period [Abstract]
Land and improvements				4,187
Buildings and improvements				21,644
Total	$ 25,831			25,831
Accumulated depreciation	$ (11,954)			(11,954)
Date of construction	1976
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,831
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,954
Unencumbered Apartment Communities [Member] | Country Villas [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Country Villas [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Crow Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	400
Initial cost [Abstract]
Land				37,579
Buildings and improvements				87,685
Costs capitalized subsequent to acquisition				9,894
Gross amount carried at close of period [Abstract]
Land and improvements				37,579
Buildings and improvements				97,579
Total	$ 135,158			135,158
Accumulated depreciation	$ (17,605)			(17,605)
Date of construction	1992
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 135,158
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 17,605
Unencumbered Apartment Communities [Member] | Crow Canyon [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Crow Canyon [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Deer Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	171
Initial cost [Abstract]
Land				21,478
Buildings and improvements				50,116
Costs capitalized subsequent to acquisition				2,481
Gross amount carried at close of period [Abstract]
Land and improvements				21,478
Buildings and improvements				52,597
Total	$ 74,075			74,075
Accumulated depreciation	$ (9,580)			(9,580)
Date of construction	1996
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 74,075
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,580
Unencumbered Apartment Communities [Member] | Deer Valley [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Deer Valley [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Delano [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	126
Initial cost [Abstract]
Land				7,470
Buildings and improvements				22,511
Costs capitalized subsequent to acquisition				1,330
Gross amount carried at close of period [Abstract]
Land and improvements				7,470
Buildings and improvements				23,841
Total	$ 31,311			31,311
Accumulated depreciation	$ (5,852)			(5,852)
Date of construction	2005
Date acquired	Dec-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,311
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,852
Unencumbered Apartment Communities [Member] | Delano [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Delano [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Devonshire [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	276
Initial cost [Abstract]
Land				3,470
Buildings and improvements				13,786
Costs capitalized subsequent to acquisition				4,993
Gross amount carried at close of period [Abstract]
Land and improvements				3,482
Buildings and improvements				18,767
Total	$ 22,249			22,249
Accumulated depreciation	$ (10,271)			(10,271)
Date of construction	1988
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,249
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,271
Unencumbered Apartment Communities [Member] | Devonshire [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Devonshire [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Ellington [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Ellington [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Emerald Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	160
Initial cost [Abstract]
Land				8,458
Buildings and improvements				33,832
Costs capitalized subsequent to acquisition				1,869
Gross amount carried at close of period [Abstract]
Land and improvements				8,458
Buildings and improvements				35,701
Total	$ 44,159			44,159
Accumulated depreciation	$ (6,477)			(6,477)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 44,159
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,477
Unencumbered Apartment Communities [Member] | Emerald Pointe [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Emerald Pointe [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Emerald Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	180
Initial cost [Abstract]
Land				3,449
Buildings and improvements				7,801
Costs capitalized subsequent to acquisition				5,871
Gross amount carried at close of period [Abstract]
Land and improvements				3,449
Buildings and improvements				13,672
Total	$ 17,121			17,121
Accumulated depreciation	$ (10,213)			(10,213)
Date of construction	1987
Date acquired	Nov-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,121
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,213
Unencumbered Apartment Communities [Member] | Emerald Ridge [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Emerald Ridge [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Emerson Valley Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	144
Initial cost [Abstract]
Land				13,378
Buildings and improvements				53,240
Costs capitalized subsequent to acquisition				408
Gross amount carried at close of period [Abstract]
Land and improvements				13,378
Buildings and improvements				53,648
Total	$ 67,026			67,026
Accumulated depreciation	$ (3,861)			(3,861)
Date of construction	2012
Date acquired	Dec-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 67,026
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 3,861
Unencumbered Apartment Communities [Member] | Emerson Valley Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Emerson Valley Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Enso [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	183
Initial cost [Abstract]
Land				21,397
Buildings and improvements				71,135
Costs capitalized subsequent to acquisition				1,490
Gross amount carried at close of period [Abstract]
Land and improvements				21,397
Buildings and improvements				72,625
Total	$ 94,022			94,022
Accumulated depreciation	$ (7,869)			(7,869)
Date of construction	2014
Date acquired	Dec-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 94,022
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,869
Unencumbered Apartment Communities [Member] | Enso [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Enso [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Esplanade [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	278
Initial cost [Abstract]
Land				18,170
Buildings and improvements				40,086
Costs capitalized subsequent to acquisition				13,540
Gross amount carried at close of period [Abstract]
Land and improvements				18,429
Buildings and improvements				53,367
Total	$ 71,796			71,796
Accumulated depreciation	$ (26,905)			(26,905)
Date of construction	2002
Date acquired	Apr-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 71,796
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 26,905
Unencumbered Apartment Communities [Member] | Esplanade [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Esplanade [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Essex Skyline [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	349
Initial cost [Abstract]
Land				21,537
Buildings and improvements				146,099
Costs capitalized subsequent to acquisition				7,313
Gross amount carried at close of period [Abstract]
Land and improvements				21,537
Buildings and improvements				153,412
Total	$ 174,949			174,949
Accumulated depreciation	$ (35,662)			(35,662)
Date of construction	2008
Date acquired	Apr-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 174,949
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 35,662
Unencumbered Apartment Communities [Member] | Essex Skyline [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Essex Skyline [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Evergreen Heights [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	200
Initial cost [Abstract]
Land				3,566
Buildings and improvements				13,395
Costs capitalized subsequent to acquisition				6,026
Gross amount carried at close of period [Abstract]
Land and improvements				3,649
Buildings and improvements				19,338
Total	$ 22,987			22,987
Accumulated depreciation	$ (13,793)			(13,793)
Date of construction	1990
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,987
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,793
Unencumbered Apartment Communities [Member] | Evergreen Heights [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Evergreen Heights [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fairway Apartments at Big Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	74
Initial cost [Abstract]
Land				0
Buildings and improvements				7,850
Costs capitalized subsequent to acquisition				7,923
Gross amount carried at close of period [Abstract]
Land and improvements				0
Buildings and improvements				15,773
Total	$ 15,773			15,773
Accumulated depreciation	$ (10,717)			(10,717)
Date of construction	1972
Date acquired	Jun-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,773
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,717
Unencumbered Apartment Communities [Member] | Fairway Apartments at Big Canyon [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fairway Apartments at Big Canyon [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	28 years
Unencumbered Apartment Communities [Member] | Fairwood Pond [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	194
Initial cost [Abstract]
Land				5,296
Buildings and improvements				15,564
Costs capitalized subsequent to acquisition				3,800
Gross amount carried at close of period [Abstract]
Land and improvements				5,297
Buildings and improvements				19,363
Total	$ 24,660			24,660
Accumulated depreciation	$ (9,745)			(9,745)
Date of construction	1997
Date acquired	Oct-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 24,660
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,745
Unencumbered Apartment Communities [Member] | Fairwood Pond [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fairwood Pond [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Foothill Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	394
Initial cost [Abstract]
Land				2,435
Buildings and improvements				9,821
Costs capitalized subsequent to acquisition				39,812
Gross amount carried at close of period [Abstract]
Land and improvements				2,440
Buildings and improvements				49,628
Total	$ 52,068			52,068
Accumulated depreciation	$ (42,805)			(42,805)
Date of construction	1978
Date acquired	Mar-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 52,068
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 42,805
Unencumbered Apartment Communities [Member] | Foothill Commons [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Foothill Commons [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Foothill Gardens/Twin Creeks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	176
Initial cost [Abstract]
Land				5,875
Buildings and improvements				13,992
Costs capitalized subsequent to acquisition				10,803
Gross amount carried at close of period [Abstract]
Land and improvements				5,964
Buildings and improvements				24,706
Total	$ 30,670			30,670
Accumulated depreciation	$ (16,790)			(16,790)
Date of construction	1985
Date acquired	Feb-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,670
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,790
Unencumbered Apartment Communities [Member] | Foothill Gardens/Twin Creeks [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Foothill Gardens/Twin Creeks [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Forest View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	192
Initial cost [Abstract]
Land				3,731
Buildings and improvements				14,530
Costs capitalized subsequent to acquisition				2,843
Gross amount carried at close of period [Abstract]
Land and improvements				3,731
Buildings and improvements				17,373
Total	$ 21,104			21,104
Accumulated depreciation	$ (9,071)			(9,071)
Date of construction	1998
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 21,104
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,071
Unencumbered Apartment Communities [Member] | Forest View [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Forest View [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fountain Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	320
Initial cost [Abstract]
Land				6,702
Buildings and improvements				27,306
Costs capitalized subsequent to acquisition				12,238
Gross amount carried at close of period [Abstract]
Land and improvements				6,585
Buildings and improvements				39,661
Total	$ 46,246			46,246
Accumulated depreciation	$ (25,952)			(25,952)
Date of construction	2000
Date acquired	Mar-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 46,246
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 25,952
Unencumbered Apartment Communities [Member] | Fountain Court [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fountain Court [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fourth & U [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	171
Initial cost [Abstract]
Land				8,879
Buildings and improvements				52,351
Costs capitalized subsequent to acquisition				3,228
Gross amount carried at close of period [Abstract]
Land and improvements				8,879
Buildings and improvements				55,579
Total	$ 64,458			64,458
Accumulated depreciation	$ (17,580)			(17,580)
Date of construction	2010
Date acquired	Apr-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 64,458
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 17,580
Unencumbered Apartment Communities [Member] | Fourth & U [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fourth & U [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fox Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	445
Initial cost [Abstract]
Land				39,731
Buildings and improvements				92,706
Costs capitalized subsequent to acquisition				28,996
Gross amount carried at close of period [Abstract]
Land and improvements				39,731
Buildings and improvements				121,702
Total	$ 161,433			161,433
Accumulated depreciation	$ (27,308)			(27,308)
Date of construction	1968
Date acquired	Feb-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 161,433
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 27,308
Unencumbered Apartment Communities [Member] | Fox Plaza [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fox Plaza [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Henley I/The Henley II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	215
Initial cost [Abstract]
Land				6,695
Buildings and improvements				16,753
Costs capitalized subsequent to acquisition				26,648
Gross amount carried at close of period [Abstract]
Land and improvements				6,733
Buildings and improvements				43,363
Total	$ 50,096			50,096
Accumulated depreciation	$ (22,504)			(22,504)
Date of construction	1970
Date acquired	Jun-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,096
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 22,504
Unencumbered Apartment Communities [Member] | The Henley I/The Henley II [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Henley I/The Henley II [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Hillsdale Garden [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	697
Initial cost [Abstract]
Land				22,000
Buildings and improvements				94,681
Costs capitalized subsequent to acquisition				23,237
Gross amount carried at close of period [Abstract]
Land and improvements				22,000
Buildings and improvements				117,918
Total	$ 139,918			139,918
Accumulated depreciation	$ (53,970)			(53,970)
Date of construction	1948
Date acquired	Sep-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 139,918
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 53,970
Unencumbered Apartment Communities [Member] | Hillsdale Garden [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Hillsdale Garden [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Hope Ranch [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	108
Initial cost [Abstract]
Land				4,078
Buildings and improvements				16,877
Costs capitalized subsequent to acquisition				2,915
Gross amount carried at close of period [Abstract]
Land and improvements				4,208
Buildings and improvements				19,662
Total	$ 23,870			23,870
Accumulated depreciation	$ (7,931)			(7,931)
Date of construction	1965
Date acquired	Mar-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,870
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,931
Unencumbered Apartment Communities [Member] | Hope Ranch [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Hope Ranch [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Joule [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	295
Initial cost [Abstract]
Land				14,558
Buildings and improvements				69,417
Costs capitalized subsequent to acquisition				4,872
Gross amount carried at close of period [Abstract]
Land and improvements				14,558
Buildings and improvements				74,289
Total	$ 88,847			88,847
Accumulated depreciation	$ (24,020)			(24,020)
Date of construction	2010
Date acquired	Mar-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 88,847
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 24,020
Unencumbered Apartment Communities [Member] | Joule [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Joule [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Kings Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	196
Initial cost [Abstract]
Land				4,023
Buildings and improvements				9,527
Costs capitalized subsequent to acquisition				19,171
Gross amount carried at close of period [Abstract]
Land and improvements				4,031
Buildings and improvements				28,690
Total	$ 32,721			32,721
Accumulated depreciation	$ (15,924)			(15,924)
Date of construction	1979
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,721
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 15,924
Unencumbered Apartment Communities [Member] | Kings Road [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Kings Road [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Lafayette Highlands [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	150
Initial cost [Abstract]
Land				17,774
Buildings and improvements				41,473
Costs capitalized subsequent to acquisition				2,773
Gross amount carried at close of period [Abstract]
Land and improvements				17,774
Buildings and improvements				44,246
Total	$ 62,020			62,020
Accumulated depreciation	$ (7,883)			(7,883)
Date of construction	1973
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 62,020
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,883
Unencumbered Apartment Communities [Member] | Lafayette Highlands [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Lafayette Highlands [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Lakeshore Landing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	308
Initial cost [Abstract]
Land				38,155
Buildings and improvements				89,028
Costs capitalized subsequent to acquisition				7,166
Gross amount carried at close of period [Abstract]
Land and improvements				38,155
Buildings and improvements				96,194
Total	$ 134,349			134,349
Accumulated depreciation	$ (18,412)			(18,412)
Date of construction	1988
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 134,349
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 18,412
Unencumbered Apartment Communities [Member] | Lakeshore Landing [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Lakeshore Landing [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Laurels at Mill Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	164
Initial cost [Abstract]
Land				1,559
Buildings and improvements				6,430
Costs capitalized subsequent to acquisition				7,228
Gross amount carried at close of period [Abstract]
Land and improvements				1,595
Buildings and improvements				13,622
Total	$ 15,217			15,217
Accumulated depreciation	$ (9,827)			(9,827)
Date of construction	1981
Date acquired	Dec-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,217
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,827
Unencumbered Apartment Communities [Member] | Laurels at Mill Creek [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Laurels at Mill Creek [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Lawrence Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	336
Initial cost [Abstract]
Land				45,532
Buildings and improvements				106,735
Costs capitalized subsequent to acquisition				1,530
Gross amount carried at close of period [Abstract]
Land and improvements				45,532
Buildings and improvements				108,265
Total	$ 153,797			153,797
Accumulated depreciation	$ (23,222)			(23,222)
Date of construction	2012
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 153,797
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 23,222
Unencumbered Apartment Communities [Member] | Lawrence Station [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Lawrence Station [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Le Parc [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	140
Initial cost [Abstract]
Land				3,090
Buildings and improvements				7,421
Costs capitalized subsequent to acquisition				12,694
Gross amount carried at close of period [Abstract]
Land and improvements				3,092
Buildings and improvements				20,113
Total	$ 23,205			23,205
Accumulated depreciation	$ (15,581)			(15,581)
Date of construction	1975
Date acquired	Feb-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,205
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 15,581
Unencumbered Apartment Communities [Member] | Le Parc [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Le Parc [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Marbrisa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	202
Initial cost [Abstract]
Land				4,700
Buildings and improvements				18,605
Costs capitalized subsequent to acquisition				9,216
Gross amount carried at close of period [Abstract]
Land and improvements				4,760
Buildings and improvements				27,761
Total	$ 32,521			32,521
Accumulated depreciation	$ (15,568)			(15,568)
Date of construction	1987
Date acquired	Sep-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,521
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 15,568
Unencumbered Apartment Communities [Member] | Marbrisa [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Marbrisa [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Marina City Club [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	101
Initial cost [Abstract]
Land				0
Buildings and improvements				28,167
Costs capitalized subsequent to acquisition				29,030
Gross amount carried at close of period [Abstract]
Land and improvements				0
Buildings and improvements				57,197
Total	$ 57,197			57,197
Accumulated depreciation	$ (26,137)			(26,137)
Date of construction	1971
Date acquired	Jan-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 57,197
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 26,137
Unencumbered Apartment Communities [Member] | Marina City Club [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Marina City Club [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Marina Cove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	292
Initial cost [Abstract]
Land				5,320
Buildings and improvements				16,431
Costs capitalized subsequent to acquisition				15,312
Gross amount carried at close of period [Abstract]
Land and improvements				5,324
Buildings and improvements				31,739
Total	$ 37,063			37,063
Accumulated depreciation	$ (24,319)			(24,319)
Date of construction	1974
Date acquired	Jun-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 37,063
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 24,319
Unencumbered Apartment Communities [Member] | Marina Cove [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Marina Cove [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mariner's Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	105
Initial cost [Abstract]
Land				1,555
Buildings and improvements				6,103
Costs capitalized subsequent to acquisition				2,464
Gross amount carried at close of period [Abstract]
Land and improvements				1,562
Buildings and improvements				8,560
Total	$ 10,122			10,122
Accumulated depreciation	$ (5,668)			(5,668)
Date of construction	1987
Date acquired	May-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 10,122
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,668
Unencumbered Apartment Communities [Member] | Mariner's Place [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mariner's Place [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | MB 360 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	360
Initial cost [Abstract]
Land				21,421
Buildings and improvements				114,376
Costs capitalized subsequent to acquisition				129,017
Gross amount carried at close of period [Abstract]
Land and improvements				42,001
Buildings and improvements				222,813
Total	$ 264,814			264,814
Accumulated depreciation	$ (31,219)			(31,219)
Date of construction	2014
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 264,814
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 31,219
Unencumbered Apartment Communities [Member] | MB 360 [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | MB 360 [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mesa Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	133
Initial cost [Abstract]
Land				1,888
Buildings and improvements				7,498
Costs capitalized subsequent to acquisition				2,336
Gross amount carried at close of period [Abstract]
Land and improvements				1,894
Buildings and improvements				9,828
Total	$ 11,722			11,722
Accumulated depreciation	$ (5,120)			(5,120)
Date of construction	1963
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 11,722
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,120
Unencumbered Apartment Communities [Member] | Mesa Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mesa Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mill Creek at Windermere [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	400
Initial cost [Abstract]
Land				29,551
Buildings and improvements				69,032
Costs capitalized subsequent to acquisition				5,452
Gross amount carried at close of period [Abstract]
Land and improvements				29,551
Buildings and improvements				74,484
Total	$ 104,035			104,035
Accumulated depreciation	$ (29,077)			(29,077)
Date of construction	2005
Date acquired	Sep-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 104,035
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 29,077
Unencumbered Apartment Communities [Member] | Mill Creek at Windermere [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mill Creek at Windermere [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	103
Initial cost [Abstract]
Land				11,012
Buildings and improvements				39,982
Costs capitalized subsequent to acquisition				438
Gross amount carried at close of period [Abstract]
Land and improvements				11,012
Buildings and improvements				40,420
Total	$ 51,432			51,432
Accumulated depreciation	$ (4,232)			(4,232)
Date of construction	2015
Date acquired	Jan-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 51,432
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 4,232
Unencumbered Apartment Communities [Member] | Mio [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mio [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mirabella [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	188
Initial cost [Abstract]
Land				6,180
Buildings and improvements				26,673
Costs capitalized subsequent to acquisition				16,128
Gross amount carried at close of period [Abstract]
Land and improvements				6,270
Buildings and improvements				42,711
Total	$ 48,981			48,981
Accumulated depreciation	$ (24,505)			(24,505)
Date of construction	2000
Date acquired	May-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 48,981
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 24,505
Unencumbered Apartment Communities [Member] | Mirabella [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mirabella [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mira Monte [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	354
Initial cost [Abstract]
Land				7,165
Buildings and improvements				28,459
Costs capitalized subsequent to acquisition				11,509
Gross amount carried at close of period [Abstract]
Land and improvements				7,186
Buildings and improvements				39,947
Total	$ 47,133			47,133
Accumulated depreciation	$ (23,737)			(23,737)
Date of construction	1982
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,133
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 23,737
Unencumbered Apartment Communities [Member] | Mira Monte [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mira Monte [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Miracle Mile Marbella [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	236
Initial cost [Abstract]
Land				7,791
Buildings and improvements				23,075
Costs capitalized subsequent to acquisition				14,830
Gross amount carried at close of period [Abstract]
Land and improvements				7,886
Buildings and improvements				37,810
Total	$ 45,696			45,696
Accumulated depreciation	$ (26,268)			(26,268)
Date of construction	1988
Date acquired	Aug-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 45,696
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 26,268
Unencumbered Apartment Communities [Member] | Miracle Mile Marbella [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Miracle Mile Marbella [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mission Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	282
Initial cost [Abstract]
Land				10,099
Buildings and improvements				38,778
Costs capitalized subsequent to acquisition				7,820
Gross amount carried at close of period [Abstract]
Land and improvements				10,167
Buildings and improvements				46,530
Total	$ 56,697			56,697
Accumulated depreciation	$ (22,211)			(22,211)
Date of construction	1984
Date acquired	Jul-05
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 56,697
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 22,211
Unencumbered Apartment Communities [Member] | Mission Hills [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mission Hills [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mission Peaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	453
Initial cost [Abstract]
Land				46,499
Buildings and improvements				108,498
Costs capitalized subsequent to acquisition				6,275
Gross amount carried at close of period [Abstract]
Land and improvements				46,499
Buildings and improvements				114,773
Total	$ 161,272			161,272
Accumulated depreciation	$ (20,332)			(20,332)
Date of construction	1995
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 161,272
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 20,332
Unencumbered Apartment Communities [Member] | Mission Peaks [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Mission Peaks [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mission Peaks II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	336
Initial cost [Abstract]
Land				31,429
Buildings and improvements				73,334
Costs capitalized subsequent to acquisition				5,549
Gross amount carried at close of period [Abstract]
Land and improvements				31,429
Buildings and improvements				78,883
Total	$ 110,312			110,312
Accumulated depreciation	$ (14,566)			(14,566)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 110,312
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,566
Unencumbered Apartment Communities [Member] | Mission Peaks II [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Mission Peaks II [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Montclaire [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	390
Initial cost [Abstract]
Land				4,842
Buildings and improvements				19,776
Costs capitalized subsequent to acquisition				26,772
Gross amount carried at close of period [Abstract]
Land and improvements				4,997
Buildings and improvements				46,393
Total	$ 51,390			51,390
Accumulated depreciation	$ (40,215)			(40,215)
Date of construction	1973
Date acquired	Dec-88
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 51,390
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 40,215
Unencumbered Apartment Communities [Member] | Montclaire [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Montclaire [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Monterey Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	122
Initial cost [Abstract]
Land				2,349
Buildings and improvements				5,579
Costs capitalized subsequent to acquisition				6,723
Gross amount carried at close of period [Abstract]
Land and improvements				2,424
Buildings and improvements				12,227
Total	$ 14,651			14,651
Accumulated depreciation	$ (7,958)			(7,958)
Date of construction	1974
Date acquired	Jul-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 14,651
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,958
Unencumbered Apartment Communities [Member] | Monterey Villas [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Monterey Villas [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Muse [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	152
Initial cost [Abstract]
Land				7,822
Buildings and improvements				33,436
Costs capitalized subsequent to acquisition				3,201
Gross amount carried at close of period [Abstract]
Land and improvements				7,823
Buildings and improvements				36,636
Total	$ 44,459			44,459
Accumulated depreciation	$ (12,606)			(12,606)
Date of construction	2011
Date acquired	Feb-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 44,459
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,606
Unencumbered Apartment Communities [Member] | Muse [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Muse [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Museum Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	117
Initial cost [Abstract]
Land				13,864
Buildings and improvements				32,348
Costs capitalized subsequent to acquisition				1,642
Gross amount carried at close of period [Abstract]
Land and improvements				13,864
Buildings and improvements				33,990
Total	$ 47,854			47,854
Accumulated depreciation	$ (6,180)			(6,180)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,854
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,180
Unencumbered Apartment Communities [Member] | Museum Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Museum Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Palm Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	1,098
Initial cost [Abstract]
Land				133,802
Buildings and improvements				312,205
Costs capitalized subsequent to acquisition				8,537
Gross amount carried at close of period [Abstract]
Land and improvements				133,802
Buildings and improvements				320,742
Total	$ 454,544			454,544
Accumulated depreciation	$ (22,477)			(22,477)
Date of construction	2008
Date acquired	Jan-17
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 454,544
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 22,477
Unencumbered Apartment Communities [Member] | Palm Valley [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Palm Valley [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Paragon Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	301
Initial cost [Abstract]
Land				32,230
Buildings and improvements				77,320
Costs capitalized subsequent to acquisition				1,553
Gross amount carried at close of period [Abstract]
Land and improvements				32,230
Buildings and improvements				78,873
Total	$ 111,103			111,103
Accumulated depreciation	$ (11,935)			(11,935)
Date of construction	2013
Date acquired	Jul-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 111,103
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,935
Unencumbered Apartment Communities [Member] | Paragon Apartments [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Paragon Apartments [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park Catalina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	90
Initial cost [Abstract]
Land				4,710
Buildings and improvements				18,839
Costs capitalized subsequent to acquisition				3,224
Gross amount carried at close of period [Abstract]
Land and improvements				4,710
Buildings and improvements				22,063
Total	$ 26,773			26,773
Accumulated depreciation	$ (5,926)			(5,926)
Date of construction	2002
Date acquired	Jun-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,773
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,926
Unencumbered Apartment Communities [Member] | Park Catalina [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Park Catalina [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park Hill at Issaquah [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	245
Initial cost [Abstract]
Land				7,284
Buildings and improvements				21,937
Costs capitalized subsequent to acquisition				8,668
Gross amount carried at close of period [Abstract]
Land and improvements				7,284
Buildings and improvements				30,605
Total	$ 37,889			37,889
Accumulated depreciation	$ (14,860)			(14,860)
Date of construction	1999
Date acquired	Feb-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 37,889
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,860
Unencumbered Apartment Communities [Member] | Park Hill at Issaquah [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Park Hill at Issaquah [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park Viridian [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	320
Initial cost [Abstract]
Land				15,894
Buildings and improvements				63,574
Costs capitalized subsequent to acquisition				3,302
Gross amount carried at close of period [Abstract]
Land and improvements				15,894
Buildings and improvements				66,876
Total	$ 82,770			82,770
Accumulated depreciation	$ (12,099)			(12,099)
Date of construction	2008
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 82,770
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,099
Unencumbered Apartment Communities [Member] | Park Viridian [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Park Viridian [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	126
Initial cost [Abstract]
Land				9,424
Buildings and improvements				21,988
Costs capitalized subsequent to acquisition				12,288
Gross amount carried at close of period [Abstract]
Land and improvements				9,424
Buildings and improvements				34,276
Total	$ 43,700			43,700
Accumulated depreciation	$ (9,855)			(9,855)
Date of construction	1958
Date acquired	Sep-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 43,700
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 9,855
Unencumbered Apartment Communities [Member] | Park West [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Park West [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Parkwood at Mill Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	240
Initial cost [Abstract]
Land				10,680
Buildings and improvements				42,722
Costs capitalized subsequent to acquisition				2,808
Gross amount carried at close of period [Abstract]
Land and improvements				10,680
Buildings and improvements				45,530
Total	$ 56,210			56,210
Accumulated depreciation	$ (8,402)			(8,402)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 56,210
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,402
Unencumbered Apartment Communities [Member] | Parkwood at Mill Creek [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Parkwood at Mill Creek [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Pathways at Bixby Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	296
Initial cost [Abstract]
Land				4,083
Buildings and improvements				16,757
Costs capitalized subsequent to acquisition				20,936
Gross amount carried at close of period [Abstract]
Land and improvements				6,239
Buildings and improvements				35,537
Total	$ 41,776			41,776
Accumulated depreciation	$ (30,520)			(30,520)
Date of construction	1975
Date acquired	Feb-91
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 41,776
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 30,520
Unencumbered Apartment Communities [Member] | Pathways at Bixby Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Pathways at Bixby Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Piedmont [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	396
Initial cost [Abstract]
Land				19,848
Buildings and improvements				59,606
Costs capitalized subsequent to acquisition				11,970
Gross amount carried at close of period [Abstract]
Land and improvements				19,848
Buildings and improvements				71,576
Total	$ 91,424			91,424
Accumulated depreciation	$ (13,138)			(13,138)
Date of construction	1969
Date acquired	May-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 91,424
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,138
Unencumbered Apartment Communities [Member] | Piedmont [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Piedmont [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Pinehurst [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	28
Initial cost [Abstract]
Land				0
Buildings and improvements				1,711
Costs capitalized subsequent to acquisition				648
Gross amount carried at close of period [Abstract]
Land and improvements				0
Buildings and improvements				2,359
Total	$ 2,359			2,359
Accumulated depreciation	$ (1,359)			(1,359)
Date of construction	1973
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 2,359
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 1,359
Unencumbered Apartment Communities [Member] | Pinehurst [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Pinehurst [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	24 years
Unencumbered Apartment Communities [Member] | Pinnacle Sonata [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	268
Initial cost [Abstract]
Land				14,647
Buildings and improvements				58,586
Costs capitalized subsequent to acquisition				3,398
Gross amount carried at close of period [Abstract]
Land and improvements				14,647
Buildings and improvements				61,984
Total	$ 76,631			76,631
Accumulated depreciation	$ (11,047)			(11,047)
Date of construction	2000
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 76,631
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,047
Unencumbered Apartment Communities [Member] | Pinnacle Sonata [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Pinnacle Sonata [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Pointe at Cupertino [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	116
Initial cost [Abstract]
Land				4,505
Buildings and improvements				17,605
Costs capitalized subsequent to acquisition				12,182
Gross amount carried at close of period [Abstract]
Land and improvements				4,505
Buildings and improvements				29,787
Total	$ 34,292			34,292
Accumulated depreciation	$ (17,583)			(17,583)
Date of construction	1963
Date acquired	Aug-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 34,292
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 17,583
Unencumbered Apartment Communities [Member] | Pointe at Cupertino [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Pointe at Cupertino [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Radius [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	264
Initial cost [Abstract]
Land				11,702
Buildings and improvements				152,336
Costs capitalized subsequent to acquisition				322
Gross amount carried at close of period [Abstract]
Land and improvements				11,702
Buildings and improvements				152,658
Total	$ 164,360			164,360
Accumulated depreciation	$ (27,287)			(27,287)
Date of construction	2015
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 164,360
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 27,287
Unencumbered Apartment Communities [Member] | Radius [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Radius [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Reed Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	100
Initial cost [Abstract]
Land				6,873
Buildings and improvements				16,037
Costs capitalized subsequent to acquisition				8,274
Gross amount carried at close of period [Abstract]
Land and improvements				6,873
Buildings and improvements				24,311
Total	$ 31,184			31,184
Accumulated depreciation	$ (8,840)			(8,840)
Date of construction	1970
Date acquired	Jan-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,184
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,840
Unencumbered Apartment Communities [Member] | Reed Square [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Reed Square [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Regency at Encino [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	75
Initial cost [Abstract]
Land				3,184
Buildings and improvements				12,737
Costs capitalized subsequent to acquisition				3,615
Gross amount carried at close of period [Abstract]
Land and improvements				3,184
Buildings and improvements				16,352
Total	$ 19,536			19,536
Accumulated depreciation	$ (6,157)			(6,157)
Date of construction	1989
Date acquired	Dec-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,536
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 6,157
Unencumbered Apartment Communities [Member] | Regency at Encino [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Regency at Encino [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Renaissance at Uptown Orange [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	460
Initial cost [Abstract]
Land				27,870
Buildings and improvements				111,482
Costs capitalized subsequent to acquisition				4,959
Gross amount carried at close of period [Abstract]
Land and improvements				27,870
Buildings and improvements				116,441
Total	$ 144,311			144,311
Accumulated depreciation	$ (20,912)			(20,912)
Date of construction	2007
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 144,311
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 20,912
Unencumbered Apartment Communities [Member] | Renaissance at Uptown Orange [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Renaissance at Uptown Orange [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Reveal [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	438
Initial cost [Abstract]
Land				25,073
Buildings and improvements				121,314
Costs capitalized subsequent to acquisition				1,462
Gross amount carried at close of period [Abstract]
Land and improvements				25,073
Buildings and improvements				122,776
Total	$ 147,849			147,849
Accumulated depreciation	$ (17,821)			(17,821)
Date of construction	2010
Date acquired	Apr-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 147,849
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 17,821
Unencumbered Apartment Communities [Member] | The Reveal [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Reveal [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Salmon Run at Perry Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	132
Initial cost [Abstract]
Land				3,717
Buildings and improvements				11,483
Costs capitalized subsequent to acquisition				2,502
Gross amount carried at close of period [Abstract]
Land and improvements				3,801
Buildings and improvements				13,901
Total	$ 17,702			17,702
Accumulated depreciation	$ (8,211)			(8,211)
Date of construction	2000
Date acquired	Oct-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,702
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,211
Unencumbered Apartment Communities [Member] | Salmon Run at Perry Creek [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Salmon Run at Perry Creek [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Sammamish View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	153
Initial cost [Abstract]
Land				3,324
Buildings and improvements				7,501
Costs capitalized subsequent to acquisition				7,056
Gross amount carried at close of period [Abstract]
Land and improvements				3,331
Buildings and improvements				14,550
Total	$ 17,881			17,881
Accumulated depreciation	$ (12,089)			(12,089)
Date of construction	1986
Date acquired	Nov-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,881
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,089
Unencumbered Apartment Communities [Member] | Sammamish View [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Sammamish View [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | 101 San Fernando [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	323
Initial cost [Abstract]
Land				4,173
Buildings and improvements				58,961
Costs capitalized subsequent to acquisition				11,773
Gross amount carried at close of period [Abstract]
Land and improvements				4,173
Buildings and improvements				70,734
Total	$ 74,907			74,907
Accumulated depreciation	$ (23,484)			(23,484)
Date of construction	2001
Date acquired	Jul-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 74,907
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 23,484
Unencumbered Apartment Communities [Member] | 101 San Fernando [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | 101 San Fernando [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | San Marcos [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	432
Initial cost [Abstract]
Land				15,563
Buildings and improvements				36,204
Costs capitalized subsequent to acquisition				32,572
Gross amount carried at close of period [Abstract]
Land and improvements				22,866
Buildings and improvements				61,473
Total	$ 84,339			84,339
Accumulated depreciation	$ (31,117)			(31,117)
Date of construction	2003
Date acquired	Nov-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 84,339
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 31,117
Unencumbered Apartment Communities [Member] | San Marcos [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | San Marcos [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Santee Court/Santee Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	238
Initial cost [Abstract]
Land				9,581
Buildings and improvements				40,317
Costs capitalized subsequent to acquisition				9,296
Gross amount carried at close of period [Abstract]
Land and improvements				9,582
Buildings and improvements				49,612
Total	$ 59,194			59,194
Accumulated depreciation	$ (14,575)			(14,575)
Date of construction	2004
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 59,194
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,575
Unencumbered Apartment Communities [Member] | Santee Court/Santee Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Santee Court/Santee Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Shadow Point [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	172
Initial cost [Abstract]
Land				2,812
Buildings and improvements				11,170
Costs capitalized subsequent to acquisition				3,802
Gross amount carried at close of period [Abstract]
Land and improvements				2,820
Buildings and improvements				14,964
Total	$ 17,784			17,784
Accumulated depreciation	$ (8,108)			(8,108)
Date of construction	1983
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,784
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,108
Unencumbered Apartment Communities [Member] | Shadow Point [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Shadow Point [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Shadowbrook [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	418
Initial cost [Abstract]
Land				19,292
Buildings and improvements				77,168
Costs capitalized subsequent to acquisition				5,001
Gross amount carried at close of period [Abstract]
Land and improvements				19,292
Buildings and improvements				82,169
Total	$ 101,461			101,461
Accumulated depreciation	$ (14,797)			(14,797)
Date of construction	1986
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 101,461
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,797
Unencumbered Apartment Communities [Member] | Shadowbrook [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Shadowbrook [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Slater 116 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	108
Initial cost [Abstract]
Land				7,379
Buildings and improvements				22,138
Costs capitalized subsequent to acquisition				916
Gross amount carried at close of period [Abstract]
Land and improvements				7,379
Buildings and improvements				23,054
Total	$ 30,433			30,433
Accumulated depreciation	$ (4,293)			(4,293)
Date of construction	2013
Date acquired	Sep-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,433
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 4,293
Unencumbered Apartment Communities [Member] | Slater 116 [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Slater 116 [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Solstice [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	280
Initial cost [Abstract]
Land				34,444
Buildings and improvements				147,262
Costs capitalized subsequent to acquisition				5,603
Gross amount carried at close of period [Abstract]
Land and improvements				34,444
Buildings and improvements				152,865
Total	$ 187,309			187,309
Accumulated depreciation	$ (31,396)			(31,396)
Date of construction	2014
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 187,309
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 31,396
Unencumbered Apartment Communities [Member] | Solstice [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Solstice [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Station Park Green - Phase I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	121
Initial cost [Abstract]
Land				14,923
Buildings and improvements				82,552
Costs capitalized subsequent to acquisition				553
Gross amount carried at close of period [Abstract]
Land and improvements				14,924
Buildings and improvements				83,104
Total	$ 98,028			98,028
Accumulated depreciation	$ (2,896)			(2,896)
Date of construction	2018
Date acquired	Mar-18
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 98,028
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 2,896
Unencumbered Apartment Communities [Member] | Station Park Green - Phase I [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Station Park Green - Phase I [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Stonehedge Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	196
Initial cost [Abstract]
Land				3,167
Buildings and improvements				12,603
Costs capitalized subsequent to acquisition				7,125
Gross amount carried at close of period [Abstract]
Land and improvements				3,201
Buildings and improvements				19,694
Total	$ 22,895			22,895
Accumulated depreciation	$ (13,784)			(13,784)
Date of construction	1986
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,895
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,784
Unencumbered Apartment Communities [Member] | Stonehedge Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Stonehedge Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Summit Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	300
Initial cost [Abstract]
Land				5,959
Buildings and improvements				23,670
Costs capitalized subsequent to acquisition				7,507
Gross amount carried at close of period [Abstract]
Land and improvements				5,977
Buildings and improvements				31,159
Total	$ 37,136			37,136
Accumulated depreciation	$ (16,895)			(16,895)
Date of construction	1972
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 37,136
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,895
Unencumbered Apartment Communities [Member] | Summit Park [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Summit Park [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Taylor 28 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	197
Initial cost [Abstract]
Land				13,915
Buildings and improvements				57,700
Costs capitalized subsequent to acquisition				2,913
Gross amount carried at close of period [Abstract]
Land and improvements				13,915
Buildings and improvements				60,613
Total	$ 74,528			74,528
Accumulated depreciation	$ (10,586)			(10,586)
Date of construction	2008
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 74,528
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,586
Unencumbered Apartment Communities [Member] | Taylor 28 [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Taylor 28 [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Avery [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	121
Initial cost [Abstract]
Land				6,964
Buildings and improvements				29,922
Costs capitalized subsequent to acquisition				459
Gross amount carried at close of period [Abstract]
Land and improvements				6,964
Buildings and improvements				30,381
Total	$ 37,345			37,345
Accumulated depreciation	$ (4,867)			(4,867)
Date of construction	2014
Date acquired	Mar-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 37,345
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 4,867
Unencumbered Apartment Communities [Member] | The Avery [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Avery [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Bernard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	63
Initial cost [Abstract]
Land				3,699
Buildings and improvements				11,345
Costs capitalized subsequent to acquisition				715
Gross amount carried at close of period [Abstract]
Land and improvements				3,689
Buildings and improvements				12,070
Total	$ 15,759			15,759
Accumulated depreciation	$ (3,068)			(3,068)
Date of construction	2008
Date acquired	Sep-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,759
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 3,068
Unencumbered Apartment Communities [Member] | The Bernard [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Bernard [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Cairns [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	99
Initial cost [Abstract]
Land				6,937
Buildings and improvements				20,679
Costs capitalized subsequent to acquisition				1,965
Gross amount carried at close of period [Abstract]
Land and improvements				6,939
Buildings and improvements				22,642
Total	$ 29,581			29,581
Accumulated depreciation	$ (8,970)			(8,970)
Date of construction	2006
Date acquired	Jun-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,581
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,970
Unencumbered Apartment Communities [Member] | The Cairns [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Cairns [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	264
Initial cost [Abstract]
Land				12,555
Buildings and improvements				29,307
Costs capitalized subsequent to acquisition				8,468
Gross amount carried at close of period [Abstract]
Land and improvements				12,556
Buildings and improvements				37,774
Total	$ 50,330			50,330
Accumulated depreciation	$ (12,685)			(12,685)
Date of construction	1973
Date acquired	Jul-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,330
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,685
Unencumbered Apartment Communities [Member] | The Commons [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Commons [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Elliot at Mukilteo [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	301
Initial cost [Abstract]
Land				2,498
Buildings and improvements				10,595
Costs capitalized subsequent to acquisition				16,549
Gross amount carried at close of period [Abstract]
Land and improvements				2,824
Buildings and improvements				26,818
Total	$ 29,642			29,642
Accumulated depreciation	$ (19,937)			(19,937)
Date of construction	1981
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,642
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 19,937
Unencumbered Apartment Communities [Member] | The Elliot at Mukilteo [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Elliot at Mukilteo [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Grand [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	243
Initial cost [Abstract]
Land				4,531
Buildings and improvements				89,208
Costs capitalized subsequent to acquisition				7,131
Gross amount carried at close of period [Abstract]
Land and improvements				4,531
Buildings and improvements				96,339
Total	$ 100,870			100,870
Accumulated depreciation	$ (34,186)			(34,186)
Date of construction	2009
Date acquired	Jan-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 100,870
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 34,186
Unencumbered Apartment Communities [Member] | The Grand [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Grand [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Hallie [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	292
Initial cost [Abstract]
Land				2,202
Buildings and improvements				4,794
Costs capitalized subsequent to acquisition				54,029
Gross amount carried at close of period [Abstract]
Land and improvements				8,385
Buildings and improvements				52,640
Total	$ 61,025			61,025
Accumulated depreciation	$ (30,937)			(30,937)
Date of construction	1972
Date acquired	Apr-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 61,025
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 30,937
Unencumbered Apartment Communities [Member] | The Hallie [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Hallie [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Lofts at Pinehurst [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	118
Initial cost [Abstract]
Land				1,570
Buildings and improvements				3,912
Costs capitalized subsequent to acquisition				5,102
Gross amount carried at close of period [Abstract]
Land and improvements				1,618
Buildings and improvements				8,966
Total	$ 10,584			10,584
Accumulated depreciation	$ (5,728)			(5,728)
Date of construction	1971
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 10,584
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,728
Unencumbered Apartment Communities [Member] | The Lofts at Pinehurst [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Lofts at Pinehurst [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Palisades [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	192
Initial cost [Abstract]
Land				1,560
Buildings and improvements				6,242
Costs capitalized subsequent to acquisition				13,055
Gross amount carried at close of period [Abstract]
Land and improvements				1,565
Buildings and improvements				19,292
Total	$ 20,857			20,857
Accumulated depreciation	$ (16,842)			(16,842)
Date of construction	1977
Date acquired	May-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 20,857
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,842
Unencumbered Apartment Communities [Member] | The Stuart [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	188
Initial cost [Abstract]
Land				13,574
Buildings and improvements				54,298
Costs capitalized subsequent to acquisition				2,321
Gross amount carried at close of period [Abstract]
Land and improvements				13,574
Buildings and improvements				56,619
Total	$ 70,193			70,193
Accumulated depreciation	$ (10,547)			(10,547)
Date of construction	2007
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 70,193
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 10,547
Unencumbered Apartment Communities [Member] | The Stuart [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | The Stuart [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Trails of Redmond [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	423
Initial cost [Abstract]
Land				21,930
Buildings and improvements				87,720
Costs capitalized subsequent to acquisition				5,006
Gross amount carried at close of period [Abstract]
Land and improvements				21,930
Buildings and improvements				92,726
Total	$ 114,656			114,656
Accumulated depreciation	$ (16,701)			(16,701)
Date of construction	1985
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 114,656
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,701
Unencumbered Apartment Communities [Member] | The Trails of Redmond [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | The Trails of Redmond [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Tierra Vista [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	404
Initial cost [Abstract]
Land				13,652
Buildings and improvements				53,336
Costs capitalized subsequent to acquisition				5,415
Gross amount carried at close of period [Abstract]
Land and improvements				13,661
Buildings and improvements				58,742
Total	$ 72,403			72,403
Accumulated depreciation	$ (29,836)			(29,836)
Date of construction	2001
Date acquired	Jan-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 72,403
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 29,836
Unencumbered Apartment Communities [Member] | Tierra Vista [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Tierra Vista [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Tiffany Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	101
Initial cost [Abstract]
Land				6,949
Buildings and improvements				27,796
Costs capitalized subsequent to acquisition				1,687
Gross amount carried at close of period [Abstract]
Land and improvements				6,949
Buildings and improvements				29,483
Total	$ 36,432			36,432
Accumulated depreciation	$ (5,263)			(5,263)
Date of construction	1987
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 36,432
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 5,263
Unencumbered Apartment Communities [Member] | Tiffany Court [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Tiffany Court [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Trabucco Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	132
Initial cost [Abstract]
Land				3,638
Buildings and improvements				8,640
Costs capitalized subsequent to acquisition				3,643
Gross amount carried at close of period [Abstract]
Land and improvements				3,890
Buildings and improvements				12,031
Total	$ 15,921			15,921
Accumulated depreciation	$ (8,134)			(8,134)
Date of construction	1985
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,921
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 8,134
Unencumbered Apartment Communities [Member] | Trabucco Villas [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Trabucco Villas [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Via [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	284
Initial cost [Abstract]
Land				22,000
Buildings and improvements				82,270
Costs capitalized subsequent to acquisition				2,908
Gross amount carried at close of period [Abstract]
Land and improvements				22,016
Buildings and improvements				85,162
Total	$ 107,178			107,178
Accumulated depreciation	$ (24,816)			(24,816)
Date of construction	2011
Date acquired	Jul-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 107,178
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 24,816
Unencumbered Apartment Communities [Member] | Via [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Via [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Villa Siena [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	272
Initial cost [Abstract]
Land				13,842
Buildings and improvements				55,367
Costs capitalized subsequent to acquisition				7,249
Gross amount carried at close of period [Abstract]
Land and improvements				13,842
Buildings and improvements				62,616
Total	$ 76,458			76,458
Accumulated depreciation	$ (11,592)			(11,592)
Date of construction	1974
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 76,458
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,592
Unencumbered Apartment Communities [Member] | Villa Siena [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Villa Siena [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Village Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	272
Initial cost [Abstract]
Land				6,488
Buildings and improvements				36,768
Costs capitalized subsequent to acquisition				3,826
Gross amount carried at close of period [Abstract]
Land and improvements				6,488
Buildings and improvements				40,594
Total	$ 47,082			47,082
Accumulated depreciation	$ (7,652)			(7,652)
Date of construction	1971
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,082
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 7,652
Unencumbered Apartment Communities [Member] | Village Green [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Village Green [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Vista Belvedere [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	76
Initial cost [Abstract]
Land				5,573
Buildings and improvements				11,901
Costs capitalized subsequent to acquisition				8,708
Gross amount carried at close of period [Abstract]
Land and improvements				5,573
Buildings and improvements				20,609
Total	$ 26,182			26,182
Accumulated depreciation	$ (11,033)			(11,033)
Date of construction	1963
Date acquired	Aug-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,182
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 11,033
Unencumbered Apartment Communities [Member] | Vista Belvedere [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Vista Belvedere [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Vox Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	58
Initial cost [Abstract]
Land				5,545
Buildings and improvements				16,635
Costs capitalized subsequent to acquisition				271
Gross amount carried at close of period [Abstract]
Land and improvements				5,545
Buildings and improvements				16,906
Total	$ 22,451			22,451
Accumulated depreciation	$ (2,936)			(2,936)
Date of construction	2013
Date acquired	Oct-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,451
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 2,936
Unencumbered Apartment Communities [Member] | Vox Apartments [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Vox Apartments [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Walnut Heights [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	163
Initial cost [Abstract]
Land				4,858
Buildings and improvements				19,168
Costs capitalized subsequent to acquisition				5,383
Gross amount carried at close of period [Abstract]
Land and improvements				4,887
Buildings and improvements				24,522
Total	$ 29,409			29,409
Accumulated depreciation	$ (12,592)			(12,592)
Date of construction	1964
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,409
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,592
Unencumbered Apartment Communities [Member] | Walnut Heights [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Walnut Heights [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Wharfside Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	155
Initial cost [Abstract]
Land				2,245
Buildings and improvements				7,020
Costs capitalized subsequent to acquisition				12,046
Gross amount carried at close of period [Abstract]
Land and improvements				2,258
Buildings and improvements				19,053
Total	$ 21,311			21,311
Accumulated depreciation	$ (13,796)			(13,796)
Date of construction	1990
Date acquired	Jun-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 21,311
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 13,796
Unencumbered Apartment Communities [Member] | Wharfside Pointe [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Wharfside Pointe [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Willow Lake [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	508
Initial cost [Abstract]
Land				43,194
Buildings and improvements				101,030
Costs capitalized subsequent to acquisition				14,040
Gross amount carried at close of period [Abstract]
Land and improvements				43,194
Buildings and improvements				115,070
Total	$ 158,264			158,264
Accumulated depreciation	$ (27,006)			(27,006)
Date of construction	1989
Date acquired	Oct-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 158,264
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 27,006
Unencumbered Apartment Communities [Member] | Willow Lake [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Willow Lake [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | 5600 Wilshire [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	284
Initial cost [Abstract]
Land				30,535
Buildings and improvements				91,604
Costs capitalized subsequent to acquisition				2,258
Gross amount carried at close of period [Abstract]
Land and improvements				30,535
Buildings and improvements				93,862
Total	$ 124,397			124,397
Accumulated depreciation	$ (16,636)			(16,636)
Date of construction	2008
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 124,397
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 16,636
Unencumbered Apartment Communities [Member] | 5600 Wilshire [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | 5600 Wilshire [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Wilshire La Brea [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	478
Initial cost [Abstract]
Land				56,932
Buildings and improvements				211,998
Costs capitalized subsequent to acquisition				10,929
Gross amount carried at close of period [Abstract]
Land and improvements				56,932
Buildings and improvements				222,927
Total	$ 279,859			279,859
Accumulated depreciation	$ (44,801)			(44,801)
Date of construction	2014
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 279,859
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 44,801
Unencumbered Apartment Communities [Member] | Wilshire La Brea [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Wilshire La Brea [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Windsor Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	216
Initial cost [Abstract]
Land				4,017
Buildings and improvements				10,315
Costs capitalized subsequent to acquisition				16,659
Gross amount carried at close of period [Abstract]
Land and improvements				4,021
Buildings and improvements				26,970
Total	$ 30,991			30,991
Accumulated depreciation	$ (21,175)			(21,175)
Date of construction	1989
Date acquired	Mar-89
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,991
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 21,175
Unencumbered Apartment Communities [Member] | Windsor Ridge [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Windsor Ridge [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Woodland Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	302
Initial cost [Abstract]
Land				2,040
Buildings and improvements				8,727
Costs capitalized subsequent to acquisition				23,306
Gross amount carried at close of period [Abstract]
Land and improvements				2,044
Buildings and improvements				32,029
Total	$ 34,073			34,073
Accumulated depreciation	$ (20,855)			(20,855)
Date of construction	1978
Date acquired	Mar-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 34,073
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 20,855
Unencumbered Apartment Communities [Member] | Woodland Commons [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Woodland Commons [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Woodside Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	145
Initial cost [Abstract]
Land				5,331
Buildings and improvements				21,036
Costs capitalized subsequent to acquisition				4,179
Gross amount carried at close of period [Abstract]
Land and improvements				5,341
Buildings and improvements				25,205
Total	$ 30,546			30,546
Accumulated depreciation	$ (12,674)			$ (12,674)
Date of construction	1987
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,546
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 12,674
Unencumbered Apartment Communities [Member] | Woodside Village [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Woodside Village [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Other Property [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of real estate property | ft²				106,716
Initial cost [Abstract]
Land				$ 3,079
Buildings and improvements				12,315
Costs capitalized subsequent to acquisition				9,908
Gross amount carried at close of period [Abstract]
Land and improvements				4,308
Buildings and improvements				20,994
Total	$ 25,302			25,302
Accumulated depreciation	(14,119)			$ (14,119)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	25,302
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	14,119
Other Property [Member] | Derian Office Building [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of real estate property | ft²				106,716
Initial cost [Abstract]
Land				$ 3,079
Buildings and improvements				12,315
Costs capitalized subsequent to acquisition				9,908
Gross amount carried at close of period [Abstract]
Land and improvements				4,308
Buildings and improvements				20,994
Total	25,302			25,302
Accumulated depreciation	$ (14,119)			(14,119)
Date of construction	1983
Date acquired	Jul-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,302
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ 14,119
Other Property [Member] | Derian Office Building [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Other Property [Member] | Derian Office Building [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Real Estate, Rental Property [Member]
Gross amount carried at close of period [Abstract]
Total	$ 13,362,073	12,687,722	12,338,129	$ 13,366,101
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of year	13,362,073	12,687,722	12,338,129
Balance at the end of year	$ 13,366,101	$ 13,362,073	$ 12,687,722