SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) apartment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2014 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance				$ 2,191,481
Initial cost [Abstract]
Land				2,501,616
Buildings and improvements				8,663,818
Costs capitalized subsequent to acquisition				1,510,872
Gross amount carried at close of period [Abstract]
Land and improvements				2,559,743
Buildings and improvements				10,116,563
Total	$ 12,676,306			12,676,306
Accumulated depreciation	(1,949,892)	$ (1,564,806)	$ (1,254,886)	(2,311,546)	$ (1,564,806)
Aggregate cost for federal income tax purpose	10,000,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Acquisition, development, and improvement of real estate	609,669	1,333,102	5,833,617
Disposition of real estate	(264,832)	(246,314)	(32,693)
Balance at the end of year	12,676,306
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	(1,949,892)	(1,564,806)	(1,254,886)
Balance at beginning of year	432,165	402,687	320,921
Depreciation expense - Disposals and other	(70,511)	(17,601)	(11,001)
Balance at the end of year	$ (2,311,546)	(1,949,892)	(1,564,806)
BRE Properties, Inc. [Member]
Gross amount carried at close of period [Abstract]
Rental property expense					5,200,000
Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	16,620
Encumbrance				2,191,481
Initial cost [Abstract]
Land				794,369
Buildings and improvements				2,564,810
Costs capitalized subsequent to acquisition				529,149
Gross amount carried at close of period [Abstract]
Land and improvements				807,080
Buildings and improvements				3,081,248
Total	$ 3,888,328			3,888,328
Accumulated depreciation	(848,327)			(848,327)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	3,888,328
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (848,327)
Encumbered Apartment Communities [Member] | Avondale at Warner Center [Member] | Woodland Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	446
Encumbrance				43,687
Initial cost [Abstract]
Land				10,536
Buildings and improvements				24,522
Costs capitalized subsequent to acquisition				20,008
Gross amount carried at close of period [Abstract]
Land and improvements				10,601
Buildings and improvements				44,465
Total	$ 55,066			55,066
Accumulated depreciation	$ (28,536)			(28,536)
Date of construction	1970
Date acquired	Jan-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 55,066
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (28,536)
Encumbered Apartment Communities [Member] | Avondale at Warner Center [Member] | Woodland Hills, CA [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] | Woodland Hills, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Bel Air [Member] | San Ramon, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	462
Encumbrance				51,531
Initial cost [Abstract]
Land				12,105
Buildings and improvements				18,252
Costs capitalized subsequent to acquisition				33,311
Gross amount carried at close of period [Abstract]
Land and improvements				12,682
Buildings and improvements				50,986
Total	$ 63,668			63,668
Accumulated depreciation	$ (30,311)			(30,311)
Date of construction	1988
Date acquired	Jan-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 63,668
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (30,311)
Encumbered Apartment Communities [Member] | Bel Air [Member] | San Ramon, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Bel Air [Member] | San Ramon, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Belcarra [Member] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	296
Encumbrance				52,238
Initial cost [Abstract]
Land				21,725
Buildings and improvements				92,091
Costs capitalized subsequent to acquisition				487
Gross amount carried at close of period [Abstract]
Land and improvements				21,725
Buildings and improvements				92,578
Total	$ 114,303			114,303
Accumulated depreciation	$ (9,268)			(9,268)
Date of construction	2009
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 114,303
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,268)
Encumbered Apartment Communities [Member] | Belcarra [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Belcarra [Member] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | BellCentre [Member] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	248
Encumbrance				39,597
Initial cost [Abstract]
Land				16,197
Buildings and improvements				67,207
Costs capitalized subsequent to acquisition				3,240
Gross amount carried at close of period [Abstract]
Land and improvements				16,197
Buildings and improvements				70,447
Total	$ 86,644			86,644
Accumulated depreciation	$ (7,170)			(7,170)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 86,644
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,170)
Encumbered Apartment Communities [Member] | BellCentre [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | BellCentre [Member] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Belmont Station [Member] | Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	275
Encumbrance				29,629
Initial cost [Abstract]
Land				8,100
Buildings and improvements				66,666
Costs capitalized subsequent to acquisition				5,704
Gross amount carried at close of period [Abstract]
Land and improvements				8,267
Buildings and improvements				72,203
Total	$ 80,470			80,470
Accumulated depreciation	$ (23,456)			(23,456)
Date of construction	2009
Date acquired	Mar-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 80,470
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (23,456)
Encumbered Apartment Communities [Member] | Belmont Station [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Belmont Station [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Brookside Oaks [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	170
Encumbrance				18,536
Initial cost [Abstract]
Land				7,301
Buildings and improvements				16,310
Costs capitalized subsequent to acquisition				23,979
Gross amount carried at close of period [Abstract]
Land and improvements				10,328
Buildings and improvements				37,262
Total	$ 47,590			47,590
Accumulated depreciation	$ (18,245)			(18,245)
Date of construction	1973
Date acquired	Jun-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,590
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (18,245)
Encumbered Apartment Communities [Member] | Brookside Oaks [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Brookside Oaks [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Canyon Oaks [Member] | San Ramon, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	250
Encumbrance				27,059
Initial cost [Abstract]
Land				19,088
Buildings and improvements				44,473
Costs capitalized subsequent to acquisition				2,845
Gross amount carried at close of period [Abstract]
Land and improvements				19,088
Buildings and improvements				47,318
Total	$ 66,406			66,406
Accumulated depreciation	$ (15,836)			(15,836)
Date of construction	2005
Date acquired	May-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 66,406
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (15,836)
Encumbered Apartment Communities [Member] | Canyon Oaks [Member] | San Ramon, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Canyon Oaks [Member] | San Ramon, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Carmel Creek [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	348
Encumbrance				63,142
Initial cost [Abstract]
Land				26,842
Buildings and improvements				107,368
Costs capitalized subsequent to acquisition				3,952
Gross amount carried at close of period [Abstract]
Land and improvements				26,842
Buildings and improvements				111,320
Total	$ 138,162			138,162
Accumulated depreciation	$ (11,480)			(11,480)
Date of construction	2000
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 138,162
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,480)
Encumbered Apartment Communities [Member] | Carmel Creek [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Carmel Creek [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | City View [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	572
Encumbrance				61,761
Initial cost [Abstract]
Land				9,883
Buildings and improvements				37,670
Costs capitalized subsequent to acquisition				24,081
Gross amount carried at close of period [Abstract]
Land and improvements				10,350
Buildings and improvements				61,284
Total	$ 71,634			71,634
Accumulated depreciation	$ (41,530)			(41,530)
Date of construction	1975
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 71,634
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (41,530)
Encumbered Apartment Communities [Member] | City View [Member] | Hayward, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | City View [Member] | Hayward, CA [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] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	110
Encumbrance				15,133
Initial cost [Abstract]
Land				7,465
Buildings and improvements				21,405
Costs capitalized subsequent to acquisition				3,467
Gross amount carried at close of period [Abstract]
Land and improvements				7,465
Buildings and improvements				24,872
Total	$ 32,337			32,337
Accumulated depreciation	$ (5,651)			(5,651)
Date of construction	2000
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,337
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,651)
Encumbered Apartment Communities [Member] | Courtyard off Main [Member] | Bellevue, WA [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] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Domaine [Member] | Seattle, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	92
Encumbrance				14,597
Initial cost [Abstract]
Land				9,059
Buildings and improvements				27,177
Costs capitalized subsequent to acquisition				830
Gross amount carried at close of period [Abstract]
Land and improvements				9,059
Buildings and improvements				28,007
Total	$ 37,066			37,066
Accumulated depreciation	$ (4,152)			(4,152)
Date of construction	2009
Date acquired	Sep-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 37,066
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,152)
Encumbered Apartment Communities [Member] | Domaine [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Domaine [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Elevation [Member] | Redmond, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	158
Encumbrance				10,697
Initial cost [Abstract]
Land				4,758
Buildings and improvements				14,285
Costs capitalized subsequent to acquisition				5,961
Gross amount carried at close of period [Abstract]
Land and improvements				4,757
Buildings and improvements				20,247
Total	$ 25,004			25,004
Accumulated depreciation	$ (6,425)			(6,425)
Date of construction	1986
Date acquired	Jun-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,004
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,425)
Encumbered Apartment Communities [Member] | Elevation [Member] | Redmond, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Elevation [Member] | Redmond, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Ellington [Member] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	220
Encumbrance				21,497
Initial cost [Abstract]
Land				15,066
Buildings and improvements				45,249
Costs capitalized subsequent to acquisition				2,170
Gross amount carried at close of period [Abstract]
Land and improvements				15,066
Buildings and improvements				47,419
Total	$ 62,485			62,485
Accumulated depreciation	$ (3,879)			(3,879)
Date of construction	1994
Date acquired	Jul-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 62,485
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,879)
Encumbered Apartment Communities [Member] | Ellington [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Ellington [Member] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Fairhaven Apartments [Member] | Santa Ana, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	164
Encumbrance				15,761
Initial cost [Abstract]
Land				2,626
Buildings and improvements				10,485
Costs capitalized subsequent to acquisition				6,622
Gross amount carried at close of period [Abstract]
Land and improvements				2,957
Buildings and improvements				16,776
Total	$ 19,733			19,733
Accumulated depreciation	$ (8,593)			(8,593)
Date of construction	1970
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,733
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,593)
Encumbered Apartment Communities [Member] | Fairhaven Apartments [Member] | Santa Ana, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Fairhaven Apartments [Member] | Santa Ana, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Form 15 [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	242
Encumbrance				47,442
Initial cost [Abstract]
Land				24,510
Buildings and improvements				72,221
Costs capitalized subsequent to acquisition				4,513
Gross amount carried at close of period [Abstract]
Land and improvements				25,540
Buildings and improvements				75,704
Total	$ 101,244			101,244
Accumulated depreciation	$ (2,120)			(2,120)
Date of construction	2014
Date acquired	Mar-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 101,244
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,120)
Encumbered Apartment Communities [Member] | Form 15 [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Form 15 [Member] | San Diego, CA [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] | Foster City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	490
Encumbrance				97,220
Initial cost [Abstract]
Land				61,714
Buildings and improvements				144,000
Costs capitalized subsequent to acquisition				7,016
Gross amount carried at close of period [Abstract]
Land and improvements				61,714
Buildings and improvements				151,016
Total	$ 212,730			212,730
Accumulated depreciation	$ (15,886)			(15,886)
Date of construction	1987
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 212,730
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (15,886)
Encumbered Apartment Communities [Member] | Foster's Landing [Member] | Foster City, CA [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] | Foster City, CA [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] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	226
Encumbrance				32,118
Initial cost [Abstract]
Land				26,046
Buildings and improvements				60,773
Costs capitalized subsequent to acquisition				3,229
Gross amount carried at close of period [Abstract]
Land and improvements				26,046
Buildings and improvements				64,002
Total	$ 90,048			90,048
Accumulated depreciation	$ (6,363)			(6,363)
Date of construction	1990
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 90,048
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,363)
Encumbered Apartment Communities [Member] | Fountain At Riveroaks [Member] | San Jose, CA [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] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Fountain Park [Member] | Playa Vista, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	705
Encumbrance				82,435
Initial cost [Abstract]
Land				25,073
Buildings and improvements				94,980
Costs capitalized subsequent to acquisition				30,967
Gross amount carried at close of period [Abstract]
Land and improvements				25,203
Buildings and improvements				125,817
Total	$ 151,020			151,020
Accumulated depreciation	$ (59,294)			(59,294)
Date of construction	2002
Date acquired	Feb-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 151,020
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (59,294)
Encumbered Apartment Communities [Member] | Fountain Park [Member] | Playa Vista, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Fountain Park [Member] | Playa Vista, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Hampton Place Hampton Court [Member] | Glendale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	215
Encumbrance				19,833
Initial cost [Abstract]
Land				6,695
Buildings and improvements				16,753
Costs capitalized subsequent to acquisition				19,093
Gross amount carried at close of period [Abstract]
Land and improvements				6,733
Buildings and improvements				35,808
Total	$ 42,541			42,541
Accumulated depreciation	$ (15,684)			(15,684)
Date of construction	1970
Date acquired	Jun-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 42,541
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (15,684)
Encumbered Apartment Communities [Member] | Hampton Place Hampton Court [Member] | Glendale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Hampton Place Hampton Court [Member] | Glendale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Hidden Valley [Member] | Simi Valley, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	324
Encumbrance				29,295
Initial cost [Abstract]
Land				14,174
Buildings and improvements				34,065
Costs capitalized subsequent to acquisition				3,373
Gross amount carried at close of period [Abstract]
Land and improvements				9,674
Buildings and improvements				41,938
Total	$ 51,612			51,612
Accumulated depreciation	$ (17,484)			(17,484)
Date of construction	2004
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 51,612
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (17,484)
Encumbered Apartment Communities [Member] | Hidden Valley [Member] | Simi Valley, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Hidden Valley [Member] | Simi Valley, CA [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] | Issaquah, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	333
Encumbrance				30,901
Initial cost [Abstract]
Land				16,271
Buildings and improvements				48,932
Costs capitalized subsequent to acquisition				9,533
Gross amount carried at close of period [Abstract]
Land and improvements				16,271
Buildings and improvements				58,465
Total	$ 74,736			74,736
Accumulated depreciation	$ (18,290)			(18,290)
Date of construction	2000
Date acquired	Aug-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 74,736
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (18,290)
Encumbered Apartment Communities [Member] | Highlands at Wynhaven [Member] | Issaquah, WA [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] | Issaquah, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Highridge [Member] | Rancho Palos Verdes, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	255
Encumbrance				69,202
Initial cost [Abstract]
Land				5,419
Buildings and improvements				18,347
Costs capitalized subsequent to acquisition				29,991
Gross amount carried at close of period [Abstract]
Land and improvements				6,073
Buildings and improvements				47,684
Total	$ 53,757			53,757
Accumulated depreciation	$ (30,084)			(30,084)
Date of construction	1972
Date acquired	May-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 53,757
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (30,084)
Encumbered Apartment Communities [Member] | Highridge [Member] | Rancho Palos Verdes, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Highridge [Member] | Rancho Palos Verdes, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Hillcrest Park [Member] | Newbury Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	608
Encumbrance				64,211
Initial cost [Abstract]
Land				15,318
Buildings and improvements				40,601
Costs capitalized subsequent to acquisition				18,880
Gross amount carried at close of period [Abstract]
Land and improvements				15,755
Buildings and improvements				59,044
Total	$ 74,799			74,799
Accumulated depreciation	$ (34,815)			(34,815)
Date of construction	1973
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 74,799
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (34,815)
Encumbered Apartment Communities [Member] | Hillcrest Park [Member] | Newbury Park, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Hillcrest Park [Member] | Newbury Park, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Huntington Breakers [Member] | Huntington Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	342
Encumbrance				35,943
Initial cost [Abstract]
Land				9,306
Buildings and improvements				22,720
Costs capitalized subsequent to acquisition				18,651
Gross amount carried at close of period [Abstract]
Land and improvements				9,315
Buildings and improvements				41,362
Total	$ 50,677			50,677
Accumulated depreciation	$ (22,606)			(22,606)
Date of construction	1984
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,677
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (22,606)
Encumbered Apartment Communities [Member] | Huntington Breakers [Member] | Huntington Beach, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Huntington Breakers [Member] | Huntington Beach, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Inglenook Court [Member] | Bothell, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	224
Encumbrance				8,194
Initial cost [Abstract]
Land				3,467
Buildings and improvements				7,881
Costs capitalized subsequent to acquisition				7,159
Gross amount carried at close of period [Abstract]
Land and improvements				3,474
Buildings and improvements				15,033
Total	$ 18,507			18,507
Accumulated depreciation	$ (11,373)			(11,373)
Date of construction	1985
Date acquired	Oct-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 18,507
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,373)
Encumbered Apartment Communities [Member] | Inglenook Court [Member] | Bothell, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Inglenook Court [Member] | Bothell, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | 1000 Kiely [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	121
Encumbrance				48,414
Initial cost [Abstract]
Land				9,359
Buildings and improvements				21,845
Costs capitalized subsequent to acquisition				7,268
Gross amount carried at close of period [Abstract]
Land and improvements				9,359
Buildings and improvements				29,113
Total	$ 38,472			38,472
Accumulated depreciation	$ (7,266)			(7,266)
Date of construction	1971
Date acquired	Mar-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 38,472
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,266)
Encumbered Apartment Communities [Member] | Magnolia Square [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	188
Encumbrance				52,175
Initial cost [Abstract]
Land				8,190
Buildings and improvements				24,736
Costs capitalized subsequent to acquisition				15,223
Gross amount carried at close of period [Abstract]
Land and improvements				8,191
Buildings and improvements				39,958
Total	$ 48,149			48,149
Accumulated depreciation	$ (15,672)			(15,672)
Date of construction	1963
Date acquired	Sep-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 48,149
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (15,672)
Encumbered Apartment Communities [Member] | Magnolia Square [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Magnolia Square [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Mill Creek at Windermere [Member] | San Ramon, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	400
Encumbrance				46,414
Initial cost [Abstract]
Land				29,551
Buildings and improvements				69,032
Costs capitalized subsequent to acquisition				3,935
Gross amount carried at close of period [Abstract]
Land and improvements				29,551
Buildings and improvements				72,967
Total	$ 102,518			102,518
Accumulated depreciation	$ (23,405)			(23,405)
Date of construction	2005
Date acquired	Sep-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 102,518
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (23,405)
Encumbered Apartment Communities [Member] | Mill Creek at Windermere [Member] | San Ramon, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Mill Creek at Windermere [Member] | San Ramon, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Mirabella [Member] | Marina Del Rey, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	188
Encumbrance				42,544
Initial cost [Abstract]
Land				6,180
Buildings and improvements				26,673
Costs capitalized subsequent to acquisition				14,474
Gross amount carried at close of period [Abstract]
Land and improvements				6,270
Buildings and improvements				41,057
Total	$ 47,327			47,327
Accumulated depreciation	$ (21,140)			(21,140)
Date of construction	2000
Date acquired	May-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,327
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (21,140)
Encumbered Apartment Communities [Member] | Mirabella [Member] | Marina Del Rey, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Mirabella [Member] | Marina Del Rey, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montarosa [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	472
Encumbrance				61,972
Initial cost [Abstract]
Land				26,697
Buildings and improvements				106,787
Costs capitalized subsequent to acquisition				3,280
Gross amount carried at close of period [Abstract]
Land and improvements				26,697
Buildings and improvements				110,067
Total	$ 136,764			136,764
Accumulated depreciation	$ (11,271)			(11,271)
Date of construction	1990
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 136,764
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,271)
Encumbered Apartment Communities [Member] | Montarosa [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Montarosa [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montclaire [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	390
Encumbrance				44,122
Initial cost [Abstract]
Land				4,842
Buildings and improvements				19,776
Costs capitalized subsequent to acquisition				21,476
Gross amount carried at close of period [Abstract]
Land and improvements				4,997
Buildings and improvements				41,097
Total	$ 46,094			46,094
Accumulated depreciation	$ (35,665)			(35,665)
Date of construction	1973
Date acquired	Dec-88
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 46,094
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (35,665)
Encumbered Apartment Communities [Member] | Montclaire [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Montclaire [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montebello [Member] | Kirkland, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	248
Encumbrance				26,475
Initial cost [Abstract]
Land				13,857
Buildings and improvements				41,575
Costs capitalized subsequent to acquisition				4,077
Gross amount carried at close of period [Abstract]
Land and improvements				13,858
Buildings and improvements				45,651
Total	$ 59,509			59,509
Accumulated depreciation	$ (7,791)			(7,791)
Date of construction	1996
Date acquired	Jul-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 59,509
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,791)
Encumbered Apartment Communities [Member] | Montebello [Member] | Kirkland, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Montebello [Member] | Kirkland, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Montejo Apartments [Member] | Garden Grove, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	124
Encumbrance				11,939
Initial cost [Abstract]
Land				1,925
Buildings and improvements				7,685
Costs capitalized subsequent to acquisition				3,173
Gross amount carried at close of period [Abstract]
Land and improvements				2,194
Buildings and improvements				10,589
Total	$ 12,783			12,783
Accumulated depreciation	$ (5,420)			(5,420)
Date of construction	1974
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 12,783
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,420)
Encumbered Apartment Communities [Member] | Montejo Apartments [Member] | Garden Grove, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Montejo Apartments [Member] | Garden Grove, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Park Highland [Member] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	250
Encumbrance				26,617
Initial cost [Abstract]
Land				9,391
Buildings and improvements				38,224
Costs capitalized subsequent to acquisition				10,626
Gross amount carried at close of period [Abstract]
Land and improvements				9,391
Buildings and improvements				48,850
Total	$ 58,241			58,241
Accumulated depreciation	$ (5,230)			(5,230)
Date of construction	1993
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 58,241
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,230)
Encumbered Apartment Communities [Member] | Park Highland [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Park Highland [Member] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Park Hill at Issaquah [Member] | Issaquah, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	245
Encumbrance				27,224
Initial cost [Abstract]
Land				7,284
Buildings and improvements				21,937
Costs capitalized subsequent to acquisition				6,769
Gross amount carried at close of period [Abstract]
Land and improvements				7,284
Buildings and improvements				28,706
Total	$ 35,990			35,990
Accumulated depreciation	$ (11,712)			(11,712)
Date of construction	1999
Date acquired	Feb-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 35,990
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,712)
Encumbered Apartment Communities [Member] | Park Hill at Issaquah [Member] | Issaquah, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Park Hill at Issaquah [Member] | Issaquah, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pathways at Bixby Village [Member] | Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	296
Encumbrance				35,673
Initial cost [Abstract]
Land				4,083
Buildings and improvements				16,757
Costs capitalized subsequent to acquisition				19,526
Gross amount carried at close of period [Abstract]
Land and improvements				6,239
Buildings and improvements				34,127
Total	$ 40,366			40,366
Accumulated depreciation	$ (27,669)			(27,669)
Date of construction	1975
Date acquired	Feb-91
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 40,366
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (27,669)
Encumbered Apartment Communities [Member] | Pathways at Bixby Village [Member] | Long Beach, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Pathways at Bixby Village [Member] | Long Beach, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Piedmont [Member] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	396
Encumbrance				45,454
Initial cost [Abstract]
Land				19,848
Buildings and improvements				59,606
Costs capitalized subsequent to acquisition				9,087
Gross amount carried at close of period [Abstract]
Land and improvements				19,848
Buildings and improvements				68,693
Total	$ 88,541			88,541
Accumulated depreciation	$ (6,386)			(6,386)
Date of construction	1969
Date acquired	May-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 88,541
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,386)
Encumbered Apartment Communities [Member] | Piedmont [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Piedmont [Member] | Bellevue, WA [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] | Fullerton, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	192
Encumbrance				26,804
Initial cost [Abstract]
Land				11,019
Buildings and improvements				45,932
Costs capitalized subsequent to acquisition				1,699
Gross amount carried at close of period [Abstract]
Land and improvements				11,019
Buildings and improvements				47,631
Total	$ 58,650			58,650
Accumulated depreciation	$ (4,847)			(4,847)
Date of construction	2004
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 58,650
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,847)
Encumbered Apartment Communities [Member] | Pinnacle at Fullerton [Member] | Fullerton, CA [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] | Fullerton, CA [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] | Renton, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	180
Encumbrance				18,078
Initial cost [Abstract]
Land				7,760
Buildings and improvements				31,041
Costs capitalized subsequent to acquisition				755
Gross amount carried at close of period [Abstract]
Land and improvements				7,760
Buildings and improvements				31,796
Total	$ 39,556			39,556
Accumulated depreciation	$ (3,245)			(3,245)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 39,556
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,245)
Encumbered Apartment Communities [Member] | Pinnacle on Lake Washington [Member] | Renton, WA [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] | Renton, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Pinnacle at MacArthur Ranch [Member] | Santa Ana, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	253
Encumbrance				38,538
Initial cost [Abstract]
Land				15,810
Buildings and improvements				66,401
Costs capitalized subsequent to acquisition				2,115
Gross amount carried at close of period [Abstract]
Land and improvements				15,810
Buildings and improvements				68,516
Total	$ 84,326			84,326
Accumulated depreciation	$ (6,945)			(6,945)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 84,326
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,945)
Encumbered Apartment Communities [Member] | Pinnacle at MacArthur Ranch [Member] | Santa Ana, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Pinnacle at MacArthur Ranch [Member] | Santa Ana, CA [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] | Chula Vista, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	364
Encumbrance				40,069
Initial cost [Abstract]
Land				17,023
Buildings and improvements				68,093
Costs capitalized subsequent to acquisition				2,561
Gross amount carried at close of period [Abstract]
Land and improvements				17,023
Buildings and improvements				70,654
Total	$ 87,677			87,677
Accumulated depreciation	$ (7,157)			(7,157)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 87,677
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,157)
Encumbered Apartment Communities [Member] | Pinnacle at Otay Ranch I & II [Member] | Chula Vista, CA [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] | Chula Vista, CA [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] | San Clemente, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	362
Encumbrance				44,804
Initial cost [Abstract]
Land				19,292
Buildings and improvements				77,168
Costs capitalized subsequent to acquisition				1,576
Gross amount carried at close of period [Abstract]
Land and improvements				19,292
Buildings and improvements				78,744
Total	$ 98,036			98,036
Accumulated depreciation	$ (8,014)			(8,014)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 98,036
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,014)
Encumbered Apartment Communities [Member] | Pinnacle at Talega [Member] | Irvine, CA [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] | Irvine, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Stevenson Place [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	200
Encumbrance				20,628
Initial cost [Abstract]
Land				996
Buildings and improvements				5,582
Costs capitalized subsequent to acquisition				10,694
Gross amount carried at close of period [Abstract]
Land and improvements				1,001
Buildings and improvements				16,271
Total	$ 17,272			17,272
Accumulated depreciation	$ (11,105)			(11,105)
Date of construction	1975
Date acquired	Apr-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,272
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,105)
Encumbered Apartment Communities [Member] | Stevenson Place [Member] | Fremont, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Stevenson Place [Member] | Fremont, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Summerhill Park [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	100
Encumbrance				12,793
Initial cost [Abstract]
Land				2,654
Buildings and improvements				4,918
Costs capitalized subsequent to acquisition				10,432
Gross amount carried at close of period [Abstract]
Land and improvements				2,656
Buildings and improvements				15,348
Total	$ 18,004			18,004
Accumulated depreciation	$ (7,221)			(7,221)
Date of construction	1988
Date acquired	Sep-88
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 18,004
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,221)
Encumbered Apartment Communities [Member] | Summerhill Park [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Summerhill Park [Member] | Sunnyvale, CA [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] | Seattle, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	137
Encumbrance				21,279
Initial cost [Abstract]
Land				9,228
Buildings and improvements				36,911
Costs capitalized subsequent to acquisition				423
Gross amount carried at close of period [Abstract]
Land and improvements				9,228
Buildings and improvements				37,334
Total	$ 46,562			46,562
Accumulated depreciation	$ (3,761)			(3,761)
Date of construction	1992
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 46,562
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,761)
Encumbered Apartment Communities [Member] | The Audrey at Belltown [Member] | Seattle, WA [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] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Barkley [Member] | Anaheim, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	161
Encumbrance				15,666
Initial cost [Abstract]
Land				0
Buildings and improvements				8,520
Costs capitalized subsequent to acquisition				5,984
Gross amount carried at close of period [Abstract]
Land and improvements				2,353
Buildings and improvements				12,151
Total	$ 14,504			14,504
Accumulated depreciation	$ (6,678)			(6,678)
Date of construction	1984
Date acquired	Apr-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 14,504
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,678)
Encumbered Apartment Communities [Member] | The Barkley [Member] | Anaheim, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Barkley [Member] | Anaheim, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Bernard [Member] | Seattle, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	63
Encumbrance				8,841
Initial cost [Abstract]
Land				3,699
Buildings and improvements				11,345
Costs capitalized subsequent to acquisition				384
Gross amount carried at close of period [Abstract]
Land and improvements				3,689
Buildings and improvements				11,739
Total	$ 15,428			15,428
Accumulated depreciation	$ (2,136)			(2,136)
Date of construction	2008
Date acquired	Sep-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,428
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,136)
Encumbered Apartment Communities [Member] | The Bernard [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Bernard [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Dylan [Member] | West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	184
Encumbrance				59,866
Initial cost [Abstract]
Land				19,984
Buildings and improvements				82,286
Costs capitalized subsequent to acquisition				405
Gross amount carried at close of period [Abstract]
Land and improvements				19,984
Buildings and improvements				82,691
Total	$ 102,675			102,675
Accumulated depreciation	$ (5,863)			(5,863)
Date of construction	2015
Date acquired	Mar-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 102,675
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,863)
Encumbered Apartment Communities [Member] | The Dylan [Member] | West Hollywood, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Dylan [Member] | West Hollywood, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Elliot [Member] | Mukilteo, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	301
Encumbrance				10,639
Initial cost [Abstract]
Land				2,498
Buildings and improvements				10,595
Costs capitalized subsequent to acquisition				15,308
Gross amount carried at close of period [Abstract]
Land and improvements				2,824
Buildings and improvements				25,577
Total	$ 28,401			28,401
Accumulated depreciation	$ (16,550)			(16,550)
Date of construction	1981
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 28,401
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (16,550)
Encumbered Apartment Communities [Member] | The Elliot [Member] | Mukilteo, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Elliot [Member] | Mukilteo, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Huntington [Member] | Huntington Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	276
Encumbrance				29,861
Initial cost [Abstract]
Land				10,374
Buildings and improvements				41,495
Costs capitalized subsequent to acquisition				4,191
Gross amount carried at close of period [Abstract]
Land and improvements				10,374
Buildings and improvements				45,686
Total	$ 56,060			56,060
Accumulated depreciation	$ (7,652)			(7,652)
Date of construction	1975
Date acquired	Jun-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 56,060
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,652)
Encumbered Apartment Communities [Member] | The Huntington [Member] | Huntington Beach, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Huntington [Member] | Huntington Beach, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Huxley [Member] | West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	187
Encumbrance				54,501
Initial cost [Abstract]
Land				19,362
Buildings and improvements				75,641
Costs capitalized subsequent to acquisition				770
Gross amount carried at close of period [Abstract]
Land and improvements				19,362
Buildings and improvements				76,411
Total	$ 95,773			95,773
Accumulated depreciation	$ (5,537)			(5,537)
Date of construction	2014
Date acquired	Mar-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 95,773
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,537)
Encumbered Apartment Communities [Member] | The Huxley [Member] | West Hollywood, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Huxley [Member] | West Hollywood, CA [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] | Oakland, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	282
Encumbrance				53,055
Initial cost [Abstract]
Land				33,554
Buildings and improvements				78,292
Costs capitalized subsequent to acquisition				4,246
Gross amount carried at close of period [Abstract]
Land and improvements				33,554
Buildings and improvements				82,538
Total	$ 116,092			116,092
Accumulated depreciation	$ (8,759)			(8,759)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 116,092
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,759)
Encumbered Apartment Communities [Member] | The Landing at Jack London Square [Member] | Oakland, CA [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] | Oakland, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Palisades [Member] | Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	192
Encumbrance				19,752
Initial cost [Abstract]
Land				1,560
Buildings and improvements				6,242
Costs capitalized subsequent to acquisition				12,093
Gross amount carried at close of period [Abstract]
Land and improvements				1,565
Buildings and improvements				18,330
Total	$ 19,895			19,895
Accumulated depreciation	$ (15,115)			(15,115)
Date of construction	1977
Date acquired	May-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,895
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (15,115)
Encumbered Apartment Communities [Member] | The Palisades [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Palisades [Member] | Bellevue, WA [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] | Laguna Niguel, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	460
Encumbrance				55,441
Initial cost [Abstract]
Land				23,584
Buildings and improvements				94,334
Costs capitalized subsequent to acquisition				3,393
Gross amount carried at close of period [Abstract]
Land and improvements				23,584
Buildings and improvements				97,727
Total	$ 121,311			121,311
Accumulated depreciation	$ (9,922)			(9,922)
Date of construction	1988
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 121,311
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,922)
Encumbered Apartment Communities [Member] | The Palms at Laguna Niguel [Member] | Laguna Niguel, CA [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] | Laguna Niguel, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Waterford [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	238
Encumbrance				30,240
Initial cost [Abstract]
Land				11,808
Buildings and improvements				24,500
Costs capitalized subsequent to acquisition				14,172
Gross amount carried at close of period [Abstract]
Land and improvements				15,165
Buildings and improvements				35,315
Total	$ 50,480			50,480
Accumulated depreciation	$ (19,053)			(19,053)
Date of construction	2000
Date acquired	Jun-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,480
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (19,053)
Encumbered Apartment Communities [Member] | The Waterford [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Waterford [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Tierra Vista [Member] | Oxnard, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	404
Encumbrance				52,715
Initial cost [Abstract]
Land				13,652
Buildings and improvements				53,336
Costs capitalized subsequent to acquisition				4,595
Gross amount carried at close of period [Abstract]
Land and improvements				13,661
Buildings and improvements				57,922
Total	$ 71,583			71,583
Accumulated depreciation	$ (25,300)			(25,300)
Date of construction	2001
Date acquired	Jan-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 71,583
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (25,300)
Encumbered Apartment Communities [Member] | Tierra Vista [Member] | Oxnard, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Tierra Vista [Member] | Oxnard, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Valley Park [Member] | Fountain Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	160
Encumbrance				21,530
Initial cost [Abstract]
Land				3,361
Buildings and improvements				13,420
Costs capitalized subsequent to acquisition				5,545
Gross amount carried at close of period [Abstract]
Land and improvements				3,761
Buildings and improvements				18,565
Total	$ 22,326			22,326
Accumulated depreciation	$ (9,050)			(9,050)
Date of construction	1969
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,326
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,050)
Encumbered Apartment Communities [Member] | Valley Park [Member] | Fountain Valley [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Valley Park [Member] | Fountain Valley [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Villa Angelina [Member] | Placentia, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	256
Encumbrance				24,723
Initial cost [Abstract]
Land				4,498
Buildings and improvements				17,962
Costs capitalized subsequent to acquisition				6,808
Gross amount carried at close of period [Abstract]
Land and improvements				4,962
Buildings and improvements				24,306
Total	$ 29,268			29,268
Accumulated depreciation	$ (12,185)			(12,185)
Date of construction	1970
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,268
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,185)
Encumbered Apartment Communities [Member] | Villa Angelina [Member] | Placentia, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Villa Angelina [Member] | Placentia, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Villa Grenada [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	270
Encumbrance				58,828
Initial cost [Abstract]
Land				38,299
Buildings and improvements				89,365
Costs capitalized subsequent to acquisition				1,059
Gross amount carried at close of period [Abstract]
Land and improvements				38,299
Buildings and improvements				90,424
Total	$ 128,723			128,723
Accumulated depreciation	$ (9,193)			(9,193)
Date of construction	2010
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 128,723
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,193)
Encumbered Apartment Communities [Member] | Villa Grenada [Member] | Santa Clara, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Encumbered Apartment Communities [Member] | Villa Grenada [Member] | Santa Clara, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Wandering Creek [Member] | Kent, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	156
Encumbrance				5,224
Initial cost [Abstract]
Land				1,285
Buildings and improvements				4,980
Costs capitalized subsequent to acquisition				3,981
Gross amount carried at close of period [Abstract]
Land and improvements				1,296
Buildings and improvements				8,950
Total	$ 10,246			10,246
Accumulated depreciation	$ (6,767)			(6,767)
Date of construction	1986
Date acquired	Nov-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 10,246
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,767)
Encumbered Apartment Communities [Member] | Wandering Creek [Member] | Kent, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Wandering Creek [Member] | Kent, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Wilshire Promenade [Member] | Fullerton, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	149
Encumbrance				16,924
Initial cost [Abstract]
Land				3,118
Buildings and improvements				7,385
Costs capitalized subsequent to acquisition				7,984
Gross amount carried at close of period [Abstract]
Land and improvements				3,797
Buildings and improvements				14,690
Total	$ 18,487			18,487
Accumulated depreciation	$ (9,114)			(9,114)
Date of construction	1992
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 18,487
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,114)
Encumbered Apartment Communities [Member] | Wilshire Promenade [Member] | Fullerton, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Wilshire Promenade [Member] | Fullerton, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Bella Villagio [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Bella Villagio [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | Camino Ruiz Square [Member] | Camarillo, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | Camino Ruiz Square [Member] | Camarillo, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Encumbered Apartment Communities [Member] | The Avery [Member] | Anaheim, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Encumbered Apartment Communities [Member] | The Avery [Member] | Anaheim, CA [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	31,481
Initial cost [Abstract]
Land				1,693,968
Buildings and improvements				6,072,893
Costs capitalized subsequent to acquisition				977,660
Gross amount carried at close of period [Abstract]
Land and improvements				1,738,155
Buildings and improvements				7,006,366
Total	$ 8,744,521			8,744,521
Accumulated depreciation	(1,446,609)			(1,446,609)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	8,744,521
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (1,446,609)
Unencumbered Apartment Communities [Member] | 1000 Kiely [Member] | Santa Clara, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | 1000 Kiely [Member] | Santa Clara, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Eighth And Hope [Member] | Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	290
Initial cost [Abstract]
Land				29,279
Buildings and improvements				169,350
Costs capitalized subsequent to acquisition				1,746
Gross amount carried at close of period [Abstract]
Land and improvements				29,279
Buildings and improvements				171,096
Total	$ 200,375			200,375
Accumulated depreciation	$ (11,991)			(11,991)
Date of construction	2014
Date acquired	Feb-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 200,375
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,991)
Unencumbered Apartment Communities [Member] | Eighth And Hope [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Eighth And Hope [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Alessio [Member] | Los Angeles, CA [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				4,416
Gross amount carried at close of period [Abstract]
Land and improvements				32,136
Buildings and improvements				132,959
Total	$ 165,095			165,095
Accumulated depreciation	$ (13,779)			(13,779)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 165,095
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,779)
Unencumbered Apartment Communities [Member] | Alessio [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Alessio [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Allegro [Member] | Valley Village, CA [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				1,811
Gross amount carried at close of period [Abstract]
Land and improvements				5,869
Buildings and improvements				25,788
Total	$ 31,657			31,657
Accumulated depreciation	$ (7,554)			(7,554)
Date of construction	2010
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,657
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,554)
Unencumbered Apartment Communities [Member] | Allegro [Member] | Valley Village, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Allegro [Member] | Valley Village, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Allure [Member] | San Diego, CA [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				862
Gross amount carried at close of period [Abstract]
Land and improvements				11,923
Buildings and improvements				48,552
Total	$ 60,475			60,475
Accumulated depreciation	$ (4,885)			(4,885)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 60,475
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,885)
Unencumbered Apartment Communities [Member] | Allure [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Allure [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Alpine Village [Member] | Alpine, CA [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				7,285
Gross amount carried at close of period [Abstract]
Land and improvements				4,982
Buildings and improvements				26,998
Total	$ 31,980			31,980
Accumulated depreciation	$ (12,764)			(12,764)
Date of construction	1971
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,980
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,764)
Unencumbered Apartment Communities [Member] | Alpine Village [Member] | Alpine, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Alpine Village [Member] | Alpine, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Anavia [Member] | Anaheim, CA [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				7,262
Gross amount carried at close of period [Abstract]
Land and improvements				15,925
Buildings and improvements				70,974
Total	$ 86,899			86,899
Accumulated depreciation	$ (14,512)			(14,512)
Date of construction	2009
Date acquired	Dec-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 86,899
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (14,512)
Unencumbered Apartment Communities [Member] | Anavia [Member] | Anaheim, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Anavia [Member] | Anaheim, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Annaliese [Member] | Seattle, WA [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				426
Gross amount carried at close of period [Abstract]
Land and improvements				4,726
Buildings and improvements				14,656
Total	$ 19,382			19,382
Accumulated depreciation	$ (1,977)			(1,977)
Date of construction	2009
Date acquired	Jan-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,382
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (1,977)
Unencumbered Apartment Communities [Member] | Annaliese [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Annaliese [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Apex [Member] | Milpitas, CA [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				1,685
Gross amount carried at close of period [Abstract]
Land and improvements				44,240
Buildings and improvements				104,936
Total	$ 149,176			149,176
Accumulated depreciation	$ (8,143)			(8,143)
Date of construction	2014
Date acquired	Aug-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 149,176
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,143)
Unencumbered Apartment Communities [Member] | Apex [Member] | Milpitas, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Apex [Member] | Milpitas, CA [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] | Marina Del Rey, CA [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				8,039
Gross amount carried at close of period [Abstract]
Land and improvements				58,442
Buildings and improvements				183,365
Total	$ 241,807			241,807
Accumulated depreciation	$ (19,062)			(19,062)
Date of construction	2001
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 241,807
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (19,062)
Unencumbered Apartment Communities [Member] | Aqua at Marina Del Rey [Member] | Marina Del Rey, CA [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] | Marina Del Rey, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Ascent [Member] | Kirkland, WA [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				1,726
Gross amount carried at close of period [Abstract]
Land and improvements				3,924
Buildings and improvements				13,588
Total	$ 17,512			17,512
Accumulated depreciation	$ (2,335)			(2,335)
Date of construction	1988
Date acquired	Oct-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,512
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,335)
Unencumbered Apartment Communities [Member] | Ascent [Member] | Kirkland, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Ascent [Member] | Kirkland, WA [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] | Los Angeles, CA [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				12
Gross amount carried at close of period [Abstract]
Land and improvements				23,550
Buildings and improvements				93,823
Total	$ 117,373			117,373
Accumulated depreciation	$ (136)			(136)
Date of construction	2014
Date acquired	Dec-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 117,373
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (136)
Unencumbered Apartment Communities [Member] | Ashton Sherman Village [Member] | Los Angeles, CA [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] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Avant [Member] | Los Angeles, CA [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				593
Gross amount carried at close of period [Abstract]
Land and improvements				32,379
Buildings and improvements				138,533
Total	$ 170,912			170,912
Accumulated depreciation	$ (6,522)			(6,522)
Date of construction	2014
Date acquired	Jun-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 170,912
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,522)
Unencumbered Apartment Communities [Member] | Avant [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Avant [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Avenue 64 [Member] | Emeryville, CA [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				13,349
Gross amount carried at close of period [Abstract]
Land and improvements				27,235
Buildings and improvements				77,752
Total	$ 104,987			104,987
Accumulated depreciation	$ (7,074)			(7,074)
Date of construction	2007
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 104,987
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,074)
Unencumbered Apartment Communities [Member] | Avenue 64 [Member] | Emeryville, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Avenue 64 [Member] | Emeryville, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Aviara [Member] | Mercer Island, CA [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				498
Gross amount carried at close of period [Abstract]
Land and improvements				0
Buildings and improvements				50,311
Total	$ 50,311			50,311
Accumulated depreciation	$ (5,693)			(5,693)
Date of construction	2013
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,311
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,693)
Unencumbered Apartment Communities [Member] | Aviara [Member] | Mercer Island, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Aviara [Member] | Mercer Island, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Axis 2300 [Member] | Irvine, CA [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				1,287
Gross amount carried at close of period [Abstract]
Land and improvements				5,405
Buildings and improvements				34,872
Total	$ 40,277			40,277
Accumulated depreciation	$ (9,957)			(9,957)
Date of construction	2010
Date acquired	Aug-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 40,277
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,957)
Unencumbered Apartment Communities [Member] | Axis 2300 [Member] | Irvine, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Axis 2300 [Member] | Irvine, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bella Villagio [Member] | San Jose, CA [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				2,544
Gross amount carried at close of period [Abstract]
Land and improvements				17,247
Buildings and improvements				42,887
Total	$ 60,134			60,134
Accumulated depreciation	$ (9,707)			(9,707)
Date of construction	2004
Date acquired	Sep-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 60,134
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,707)
Unencumbered Apartment Communities [Member] | Bella Villagio [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bella Villagio [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bellerive [Member] | Los Angeles, CA [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				856
Gross amount carried at close of period [Abstract]
Land and improvements				5,401
Buildings and improvements				22,659
Total	$ 28,060			28,060
Accumulated depreciation	$ (5,427)			(5,427)
Date of construction	2011
Date acquired	Aug-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 28,060
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,427)
Unencumbered Apartment Communities [Member] | Bellerive [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bellerive [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Belmont Terrace [Member] | Belmont, CA [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				5,181
Gross amount carried at close of period [Abstract]
Land and improvements				4,473
Buildings and improvements				15,444
Total	$ 19,917			19,917
Accumulated depreciation	$ (6,223)			(6,223)
Date of construction	1974
Date acquired	Oct-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,917
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,223)
Unencumbered Apartment Communities [Member] | Belmont Terrace [Member] | Belmont, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Belmont Terrace [Member] | Belmont, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bennett Lofts [Member] | San Francisco, CA [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				27,370
Gross amount carried at close of period [Abstract]
Land and improvements				28,371
Buildings and improvements				71,570
Total	$ 99,941			99,941
Accumulated depreciation	$ (10,291)			(10,291)
Date of construction	2004
Date acquired	Dec-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 99,941
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,291)
Unencumbered Apartment Communities [Member] | Bennett Lofts [Member] | San Francisco, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bennett Lofts [Member] | San Francisco, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bernardo Crest [Member] | San Diego, CA [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				2,263
Gross amount carried at close of period [Abstract]
Land and improvements				10,802
Buildings and improvements				45,472
Total	$ 56,274			56,274
Accumulated depreciation	$ (4,633)			(4,633)
Date of construction	1988
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 56,274
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,633)
Unencumbered Apartment Communities [Member] | Bernardo Crest [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Bernardo Crest [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bonita Cedars [Member] | Bonita, CA [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				2,842
Gross amount carried at close of period [Abstract]
Land and improvements				2,503
Buildings and improvements				12,748
Total	$ 15,251			15,251
Accumulated depreciation	$ (6,100)			(6,100)
Date of construction	1983
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 15,251
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,100)
Unencumbered Apartment Communities [Member] | Bonita Cedars [Member] | Bonita, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bonita Cedars [Member] | Bonita, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Boulevard [Member] | Fremont, CA [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				11,391
Gross amount carried at close of period [Abstract]
Land and improvements				3,580
Buildings and improvements				19,513
Total	$ 23,093			23,093
Accumulated depreciation	$ (14,961)			(14,961)
Date of construction	1978
Date acquired	Jan-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,093
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (14,961)
Unencumbered Apartment Communities [Member] | Boulevard [Member] | Fremont, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Boulevard [Member] | Fremont, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bridle Trails [Member] | Kirkland, WA [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				5,622
Gross amount carried at close of period [Abstract]
Land and improvements				1,531
Buildings and improvements				11,521
Total	$ 13,052			13,052
Accumulated depreciation	$ (7,672)			(7,672)
Date of construction	1986
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 13,052
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,672)
Unencumbered Apartment Communities [Member] | Bridle Trails [Member] | Kirkland, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bridle Trails [Member] | Kirkland, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Brighton Ridge [Member] | Renton, WA [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				4,523
Gross amount carried at close of period [Abstract]
Land and improvements				2,656
Buildings and improvements				15,290
Total	$ 17,946			17,946
Accumulated depreciation	$ (10,385)			(10,385)
Date of construction	1986
Date acquired	Dec-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,946
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,385)
Unencumbered Apartment Communities [Member] | Brighton Ridge [Member] | Renton, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Brighton Ridge [Member] | Renton, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bristol Commons [Member] | Sunnyvale, CA [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				8,069
Gross amount carried at close of period [Abstract]
Land and improvements				5,293
Buildings and improvements				19,907
Total	$ 25,200			25,200
Accumulated depreciation	$ (11,273)			(11,273)
Date of construction	1989
Date acquired	Jan-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,200
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,273)
Unencumbered Apartment Communities [Member] | Bristol Commons [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bristol Commons [Member] | Sunnyvale, CA [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] | Glendale, CA [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				2,111
Gross amount carried at close of period [Abstract]
Land and improvements				8,557
Buildings and improvements				36,346
Total	$ 44,903			44,903
Accumulated depreciation	$ (8,028)			(8,028)
Date of construction	2009
Date acquired	Dec-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 44,903
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,028)
Unencumbered Apartment Communities [Member] | 416 on Broadway [Member] | Glendale, CA [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] | Glendale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Bunker Hill [Member] | Los Angeles, CA [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				63,985
Gross amount carried at close of period [Abstract]
Land and improvements				11,639
Buildings and improvements				91,715
Total	$ 103,354			103,354
Accumulated depreciation	$ (32,678)			(32,678)
Date of construction	1968
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 103,354
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (32,678)
Unencumbered Apartment Communities [Member] | Bunker Hill [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Bunker Hill [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Camarillo Oaks [Member] | Camarillo, CA [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				5,444
Gross amount carried at close of period [Abstract]
Land and improvements				11,075
Buildings and improvements				30,576
Total	$ 41,651			41,651
Accumulated depreciation	$ (20,556)			(20,556)
Date of construction	1985
Date acquired	Jul-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 41,651
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (20,556)
Unencumbered Apartment Communities [Member] | Camarillo Oaks [Member] | Camarillo, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Camarillo Oaks [Member] | Camarillo, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Cambridge Park [Member] | San Diego, CA [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				1,619
Gross amount carried at close of period [Abstract]
Land and improvements				18,185
Buildings and improvements				74,358
Total	$ 92,543			92,543
Accumulated depreciation	$ (7,679)			(7,679)
Date of construction	1998
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 92,543
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,679)
Unencumbered Apartment Communities [Member] | Cambridge Park [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Cambridge Park [Member] | San Diego, CA [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] | Camarillo, CA [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				1,567
Gross amount carried at close of period [Abstract]
Land and improvements				6,931
Buildings and improvements				27,626
Total	$ 34,557			34,557
Accumulated depreciation	$ (9,542)			(9,542)
Date of construction	1990
Date acquired	Dec-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 34,557
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,542)
Unencumbered Apartment Communities [Member] | Canyon Pointe [Member] | Bothell, WA [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				6,623
Gross amount carried at close of period [Abstract]
Land and improvements				4,693
Buildings and improvements				24,910
Total	$ 29,603			29,603
Accumulated depreciation	$ (11,707)			(11,707)
Date of construction	1990
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,603
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,707)
Unencumbered Apartment Communities [Member] | Canyon Pointe [Member] | Bothell, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Canyon Pointe [Member] | Bothell, WA [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] | Fullerton, CA [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				8,626
Gross amount carried at close of period [Abstract]
Land and improvements				4,048
Buildings and improvements				21,235
Total	$ 25,283			25,283
Accumulated depreciation	$ (11,437)			(11,437)
Date of construction	1961
Date acquired	Sep-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,283
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,437)
Unencumbered Apartment Communities [Member] | Capri at Sunny Hills [Member] | Fullerton, CA [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] | Fullerton, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Carnel Landing [Member] | San Diego, CA [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				3,866
Gross amount carried at close of period [Abstract]
Land and improvements				16,725
Buildings and improvements				70,767
Total	$ 87,492			87,492
Accumulated depreciation	$ (7,321)			(7,321)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 87,492
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,321)
Unencumbered Apartment Communities [Member] | Carnel Landing [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Carnel Landing [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Carnel Summit [Member] | San Diego, CA [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				2,007
Gross amount carried at close of period [Abstract]
Land and improvements				14,968
Buildings and improvements				61,878
Total	$ 76,846			76,846
Accumulated depreciation	$ (6,271)			(6,271)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 76,846
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,271)
Unencumbered Apartment Communities [Member] | Carnel Summit [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Carnel Summit [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Castle Creek [Member] | New Castle, WA [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				3,066
Gross amount carried at close of period [Abstract]
Land and improvements				4,833
Buildings and improvements				18,410
Total	$ 23,243			23,243
Accumulated depreciation	$ (12,291)			(12,291)
Date of construction	1998
Date acquired	Dec-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,243
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,291)
Unencumbered Apartment Communities [Member] | Castle Creek [Member] | New Castle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Castle Creek [Member] | New Castle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Catalina Gardens [Member] | Los Angeles, CA [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				710
Gross amount carried at close of period [Abstract]
Land and improvements				6,714
Buildings and improvements				27,566
Total	$ 34,280			34,280
Accumulated depreciation	$ (2,811)			(2,811)
Date of construction	1987
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 34,280
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,811)
Unencumbered Apartment Communities [Member] | Catalina Gardens [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Catalina Gardens [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | CBC Apartments [Member] | Goleta, CA [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				5,848
Gross amount carried at close of period [Abstract]
Land and improvements				11,906
Buildings and improvements				51,103
Total	$ 63,009			63,009
Accumulated depreciation	$ (21,004)			(21,004)
Date of construction	1962
Date acquired	Jan-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 63,009
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (21,004)
Unencumbered Apartment Communities [Member] | CBC Apartments [Member] | Goleta, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | CBC Apartments [Member] | Goleta, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Cedar Terrace [Member] | Bellevue, WA [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				5,457
Gross amount carried at close of period [Abstract]
Land and improvements				5,652
Buildings and improvements				21,790
Total	$ 27,442			27,442
Accumulated depreciation	$ (9,597)			(9,597)
Date of construction	1984
Date acquired	Jan-05
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 27,442
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,597)
Unencumbered Apartment Communities [Member] | Cedar Terrace [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Cedar Terrace [Member] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | CentrePointe [Member] | San Diego, CA [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				20,221
Gross amount carried at close of period [Abstract]
Land and improvements				3,442
Buildings and improvements				27,927
Total	$ 31,369			31,369
Accumulated depreciation	$ (13,724)			(13,724)
Date of construction	1974
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,369
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,724)
Unencumbered Apartment Communities [Member] | CentrePointe [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | CentrePointe [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Chestnut Street [Member] | Santa Cruz, CA [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				1,387
Gross amount carried at close of period [Abstract]
Land and improvements				6,582
Buildings and improvements				17,076
Total	$ 23,658			23,658
Accumulated depreciation	$ (5,165)			(5,165)
Date of construction	2002
Date acquired	Jul-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,658
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,165)
Unencumbered Apartment Communities [Member] | Chestnut Street [Member] | Santa Cruz, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Chestnut Street [Member] | Santa Cruz, CA [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] | Seattle, WA [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				179
Gross amount carried at close of period [Abstract]
Land and improvements				7,276
Buildings and improvements				22,405
Total	$ 29,681			29,681
Accumulated depreciation	$ (1,973)			(1,973)
Date of construction	2013
Date acquired	May-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,681
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (1,973)
Unencumbered Apartment Communities [Member] | Collins On Pine [Member] | Seattle, WA [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] | Seattle, WA [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] | Kirkland, WA [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				2,368
Gross amount carried at close of period [Abstract]
Land and improvements				5,801
Buildings and improvements				19,783
Total	$ 25,584			25,584
Accumulated depreciation	$ (4,515)			(4,515)
Date of construction	1978
Date acquired	Nov-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,584
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,515)
Unencumbered Apartment Communities [Member] | Corbella at Juanita Bay [Member] | Kirkland, WA [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] | Kirkland, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Cortesia [Member] | Rancho Santa Margarita, CA [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				1,103
Gross amount carried at close of period [Abstract]
Land and improvements				13,912
Buildings and improvements				56,752
Total	$ 70,664			70,664
Accumulated depreciation	$ (5,799)			(5,799)
Date of construction	1999
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 70,664
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,799)
Unencumbered Apartment Communities [Member] | Cortesia [Member] | Rancho Santa Margarita, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Cortesia [Member] | Rancho Santa Margarita, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Country Villas [Member] | Oceanside, CA [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				3,902
Gross amount carried at close of period [Abstract]
Land and improvements				4,187
Buildings and improvements				20,472
Total	$ 24,659			24,659
Accumulated depreciation	$ (10,111)			(10,111)
Date of construction	1976
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 24,659
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,111)
Unencumbered Apartment Communities [Member] | Country Villas [Member] | Oceanside, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Country Villas [Member] | Oceanside, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Crow Canyon [Member] | San Ramon, CA [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				3,158
Gross amount carried at close of period [Abstract]
Land and improvements				37,579
Buildings and improvements				90,843
Total	$ 128,422			128,422
Accumulated depreciation	$ (9,277)			(9,277)
Date of construction	1992
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 128,422
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,277)
Unencumbered Apartment Communities [Member] | Crow Canyon [Member] | San Ramon, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Crow Canyon [Member] | San Ramon, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Deer Valley [Member] | San Rafael, CA [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				1,629
Gross amount carried at close of period [Abstract]
Land and improvements				21,478
Buildings and improvements				51,745
Total	$ 73,223			73,223
Accumulated depreciation	$ (5,335)			(5,335)
Date of construction	1996
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 73,223
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,335)
Unencumbered Apartment Communities [Member] | Deer Valley [Member] | San Rafael, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Deer Valley [Member] | San Rafael, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Delano [Member] | Redmond, WA [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				1,056
Gross amount carried at close of period [Abstract]
Land and improvements				7,470
Buildings and improvements				23,567
Total	$ 31,037			31,037
Accumulated depreciation	$ (4,127)			(4,127)
Date of construction	2005
Date acquired	Dec-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,037
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,127)
Unencumbered Apartment Communities [Member] | Delano [Member] | Redmond, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Delano [Member] | Redmond, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Devonshire [Member] | Hemet, CA [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				3,685
Gross amount carried at close of period [Abstract]
Land and improvements				3,482
Buildings and improvements				17,459
Total	$ 20,941			20,941
Accumulated depreciation	$ (8,659)			(8,659)
Date of construction	1988
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 20,941
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,659)
Unencumbered Apartment Communities [Member] | Devonshire [Member] | Hemet, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Devonshire [Member] | Hemet, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Domain [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	379
Initial cost [Abstract]
Land				23,848
Buildings and improvements				95,394
Costs capitalized subsequent to acquisition				1,141
Gross amount carried at close of period [Abstract]
Land and improvements				23,848
Buildings and improvements				96,535
Total	$ 120,383			120,383
Accumulated depreciation	$ (10,174)			(10,174)
Date of construction	2013
Date acquired	Nov-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 120,383
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,174)
Unencumbered Apartment Communities [Member] | Domain [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Domain [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Emerald Pointe [Member] | Diamond Bar, CA [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				1,203
Gross amount carried at close of period [Abstract]
Land and improvements				8,458
Buildings and improvements				35,035
Total	$ 43,493			43,493
Accumulated depreciation	$ (3,605)			(3,605)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 43,493
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,605)
Unencumbered Apartment Communities [Member] | Emerald Pointe [Member] | Diamond Bar, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Emerald Pointe [Member] | Diamond Bar, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Emerald Ridge [Member] | Bellevue, WA [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				4,937
Gross amount carried at close of period [Abstract]
Land and improvements				3,449
Buildings and improvements				12,738
Total	$ 16,187			16,187
Accumulated depreciation	$ (8,907)			(8,907)
Date of construction	1987
Date acquired	Nov-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 16,187
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,907)
Unencumbered Apartment Communities [Member] | Emerald Ridge [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Emerald Ridge [Member] | Bellevue, WA [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] | Los Angeles, CA [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				9
Gross amount carried at close of period [Abstract]
Land and improvements				13,378
Buildings and improvements				53,249
Total	$ 66,627			66,627
Accumulated depreciation	$ (77)			(77)
Date of construction	2012
Date acquired	Dec-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 66,627
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (77)
Unencumbered Apartment Communities [Member] | Emerson Valley Village [Member] | Los Angeles, CA [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] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Enso [Member] | San Jose, CA [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				858
Gross amount carried at close of period [Abstract]
Land and improvements				21,397
Buildings and improvements				71,993
Total	$ 93,390			93,390
Accumulated depreciation	$ (2,637)			(2,637)
Date of construction	2014
Date acquired	Dec-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 93,390
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,637)
Unencumbered Apartment Communities [Member] | Enso [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Enso [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Esplanade [Member] | San Jose, CA [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				11,222
Gross amount carried at close of period [Abstract]
Land and improvements				18,429
Buildings and improvements				51,049
Total	$ 69,478			69,478
Accumulated depreciation	$ (21,749)			(21,749)
Date of construction	2002
Date acquired	Apr-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 69,478
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (21,749)
Unencumbered Apartment Communities [Member] | Esplanade [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Esplanade [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Essex Skyline [Member] | Santa Ana, CA [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				4,587
Gross amount carried at close of period [Abstract]
Land and improvements				21,537
Buildings and improvements				150,686
Total	$ 172,223			172,223
Accumulated depreciation	$ (24,175)			(24,175)
Date of construction	2008
Date acquired	Apr-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 172,223
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (24,175)
Unencumbered Apartment Communities [Member] | Essex Skyline [Member] | Santa Ana, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Essex Skyline [Member] | Santa Ana, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Evergreen Heights [Member] | Kirkland, WA [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				4,936
Gross amount carried at close of period [Abstract]
Land and improvements				3,649
Buildings and improvements				18,248
Total	$ 21,897			21,897
Accumulated depreciation	$ (11,867)			(11,867)
Date of construction	1990
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 21,897
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,867)
Unencumbered Apartment Communities [Member] | Evergreen Heights [Member] | Kirkland, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Evergreen Heights [Member] | Kirkland, WA [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] | Newport Beach, CA [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				7,136
Gross amount carried at close of period [Abstract]
Land and improvements				9
Buildings and improvements				14,977
Total	$ 14,986			14,986
Accumulated depreciation	$ (8,513)			(8,513)
Date of construction	1972
Date acquired	Jun-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 14,986
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,513)
Unencumbered Apartment Communities [Member] | Fairway Apartments at Big Canyon [Member] | Newport Beach, CA [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] | Newport Beach, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	28 years
Unencumbered Apartment Communities [Member] | Fairwood Pond [Member] | Renton, WA [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				2,784
Gross amount carried at close of period [Abstract]
Land and improvements				5,297
Buildings and improvements				18,347
Total	$ 23,644			23,644
Accumulated depreciation	$ (8,155)			(8,155)
Date of construction	1997
Date acquired	Oct-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,644
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,155)
Unencumbered Apartment Communities [Member] | Fairwood Pond [Member] | Renton, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fairwood Pond [Member] | Renton, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Foothill Commons [Member] | Bellevue, WA [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				38,221
Gross amount carried at close of period [Abstract]
Land and improvements				2,440
Buildings and improvements				48,037
Total	$ 50,477			50,477
Accumulated depreciation	$ (34,450)			(34,450)
Date of construction	1978
Date acquired	Mar-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 50,477
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (34,450)
Unencumbered Apartment Communities [Member] | Foothill Commons [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Foothill Commons [Member] | Bellevue, WA [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] | San Ramon, CA [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				8,902
Gross amount carried at close of period [Abstract]
Land and improvements				5,964
Buildings and improvements				22,805
Total	$ 28,769			28,769
Accumulated depreciation	$ (13,660)			(13,660)
Date of construction	1985
Date acquired	Feb-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 28,769
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,660)
Unencumbered Apartment Communities [Member] | Foothill Gardens/Twin Creeks [Member] | San Ramon, CA [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] | San Ramon, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Forest View [Member] | Renton, WA [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				2,101
Gross amount carried at close of period [Abstract]
Land and improvements				3,731
Buildings and improvements				16,631
Total	$ 20,362			20,362
Accumulated depreciation	$ (7,661)			(7,661)
Date of construction	1998
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 20,362
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,661)
Unencumbered Apartment Communities [Member] | Forest View [Member] | Renton, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Forest View [Member] | Renton, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fountain Court [Member] | Seattle, WA [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				10,809
Gross amount carried at close of period [Abstract]
Land and improvements				6,585
Buildings and improvements				38,232
Total	$ 44,817			44,817
Accumulated depreciation	$ (21,314)			(21,314)
Date of construction	2000
Date acquired	Mar-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 44,817
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (21,314)
Unencumbered Apartment Communities [Member] | Fountain Court [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fountain Court [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fourth & U [Member] | Berkeley, CA [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				2,621
Gross amount carried at close of period [Abstract]
Land and improvements				8,879
Buildings and improvements				54,972
Total	$ 63,851			63,851
Accumulated depreciation	$ (13,809)			(13,809)
Date of construction	2010
Date acquired	Apr-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 63,851
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,809)
Unencumbered Apartment Communities [Member] | Fourth & U [Member] | Berkeley, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fourth & U [Member] | Berkeley, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Fox Plaza [Member] | San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	443
Initial cost [Abstract]
Land				39,731
Buildings and improvements				92,706
Costs capitalized subsequent to acquisition				18,477
Gross amount carried at close of period [Abstract]
Land and improvements				39,731
Buildings and improvements				111,183
Total	$ 150,914			150,914
Accumulated depreciation	$ (15,448)			(15,448)
Date of construction	1968
Date acquired	Feb-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 150,914
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (15,448)
Unencumbered Apartment Communities [Member] | Fox Plaza [Member] | San Francisco, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Fox Plaza [Member] | San Francisco, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Hillsdale Garden Apartments [Member] | San Mateo, CA [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				21,533
Gross amount carried at close of period [Abstract]
Land and improvements				22,000
Buildings and improvements				116,214
Total	$ 138,214			138,214
Accumulated depreciation	$ (44,137)			(44,137)
Date of construction	1948
Date acquired	Sep-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 138,214
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (44,137)
Unencumbered Apartment Communities [Member] | Hillsdale Garden Apartments [Member] | San Mateo, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Hillsdale Garden Apartments [Member] | San Mateo, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Hope Ranch Collection [Member] | Santa Barbara, CA [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				2,675
Gross amount carried at close of period [Abstract]
Land and improvements				4,208
Buildings and improvements				19,422
Total	$ 23,630			23,630
Accumulated depreciation	$ (6,308)			(6,308)
Date of construction	1965
Date acquired	Mar-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 23,630
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,308)
Unencumbered Apartment Communities [Member] | Hope Ranch Collection [Member] | Santa Barbara, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Hope Ranch Collection [Member] | Santa Barbara, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Joule [Member] | Seattle, WA [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				3,849
Gross amount carried at close of period [Abstract]
Land and improvements				14,558
Buildings and improvements				73,266
Total	$ 87,824			87,824
Accumulated depreciation	$ (18,880)			(18,880)
Date of construction	2010
Date acquired	Mar-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 87,824
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (18,880)
Unencumbered Apartment Communities [Member] | Joule [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Joule [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Kings Road [Member] | Los Angeles, CA [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				12,514
Gross amount carried at close of period [Abstract]
Land and improvements				4,031
Buildings and improvements				22,033
Total	$ 26,064			26,064
Accumulated depreciation	$ (12,625)			(12,625)
Date of construction	1979
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,064
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,625)
Unencumbered Apartment Communities [Member] | Kings Road [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Kings Road [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Lafayette Highlands [Member] | Lafayette, CA [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				851
Gross amount carried at close of period [Abstract]
Land and improvements				17,774
Buildings and improvements				42,324
Total	$ 60,098			60,098
Accumulated depreciation	$ (4,330)			(4,330)
Date of construction	1973
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 60,098
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,330)
Unencumbered Apartment Communities [Member] | Lafayette Highlands [Member] | Lafayette, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Lafayette Highlands [Member] | Lafayette, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Lakeshore Landing [Member] | San Mateo, CA [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				4,172
Gross amount carried at close of period [Abstract]
Land and improvements				38,155
Buildings and improvements				93,200
Total	$ 131,355			131,355
Accumulated depreciation	$ (10,025)			(10,025)
Date of construction	1988
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 131,355
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,025)
Unencumbered Apartment Communities [Member] | Lakeshore Landing [Member] | San Mateo, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Lakeshore Landing [Member] | San Mateo, CA [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] | Mill Creek, WA [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				5,701
Gross amount carried at close of period [Abstract]
Land and improvements				1,595
Buildings and improvements				12,095
Total	$ 13,690			13,690
Accumulated depreciation	$ (8,373)			(8,373)
Date of construction	1981
Date acquired	Dec-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 13,690
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,373)
Unencumbered Apartment Communities [Member] | Laurels at Mill Creek [Member] | Mill Creek, WA [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] | Mill Creek, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Lawrence Station [Member] | Sunnyvale, CA [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				517
Gross amount carried at close of period [Abstract]
Land and improvements				45,532
Buildings and improvements				107,252
Total	$ 152,784			152,784
Accumulated depreciation	$ (13,299)			(13,299)
Date of construction	2012
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 152,784
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,299)
Unencumbered Apartment Communities [Member] | Lawrence Station [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Lawrence Station [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Le Parc [Member] | Santa Clara, CA [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				11,503
Gross amount carried at close of period [Abstract]
Land and improvements				3,092
Buildings and improvements				18,922
Total	$ 22,014			22,014
Accumulated depreciation	$ (13,388)			(13,388)
Date of construction	1975
Date acquired	Feb-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,014
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,388)
Unencumbered Apartment Communities [Member] | Le Parc [Member] | Santa Clara, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Le Parc [Member] | Santa Clara, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Marbrisa [Member] | Long Beach, CA [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				7,913
Gross amount carried at close of period [Abstract]
Land and improvements				4,760
Buildings and improvements				26,458
Total	$ 31,218			31,218
Accumulated depreciation	$ (12,247)			(12,247)
Date of construction	1987
Date acquired	Sep-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 31,218
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,247)
Unencumbered Apartment Communities [Member] | Marbrisa [Member] | Long Beach, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Marbrisa [Member] | Long Beach, CA [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] | Marina Del Rey, CA [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				42,537
Gross amount carried at close of period [Abstract]
Land and improvements				0
Buildings and improvements				70,704
Total	$ 70,704			70,704
Accumulated depreciation	$ (20,352)			(20,352)
Date of construction	1971
Date acquired	Jan-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 70,704
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (20,352)
Unencumbered Apartment Communities [Member] | Marina City Club [Member] | Marina Del Rey, CA [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] | Marina Del Rey, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Marina Cove [Member] | Santa Clara, CA [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				13,464
Gross amount carried at close of period [Abstract]
Land and improvements				5,324
Buildings and improvements				29,891
Total	$ 35,215			35,215
Accumulated depreciation	$ (20,354)			(20,354)
Date of construction	1974
Date acquired	Jun-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 35,215
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (20,354)
Unencumbered Apartment Communities [Member] | Marina Cove [Member] | Santa Clara, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Marina Cove [Member] | Santa Clara, CA [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] | Oxnard, CA [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				2,218
Gross amount carried at close of period [Abstract]
Land and improvements				1,562
Buildings and improvements				8,314
Total	$ 9,876			9,876
Accumulated depreciation	$ (4,954)			(4,954)
Date of construction	1987
Date acquired	May-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 9,876
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,954)
Unencumbered Apartment Communities [Member] | Mariner's Place [Member] | Oxnard, CA [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] | Oxnard, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | MB 360 [Member] | San Francisco, CA [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				121,769
Gross amount carried at close of period [Abstract]
Land and improvements				42,001
Buildings and improvements				215,565
Total	$ 257,566			257,566
Accumulated depreciation	$ (12,003)			(12,003)
Date of construction	2014
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 257,566
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,003)
Unencumbered Apartment Communities [Member] | MB 360 [Member] | San Francisco, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | MB 360 [Member] | San Francisco, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mesa Village [Member] | Clairemont, CA [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				1,501
Gross amount carried at close of period [Abstract]
Land and improvements				1,894
Buildings and improvements				8,993
Total	$ 10,887			10,887
Accumulated depreciation	$ (4,323)			(4,323)
Date of construction	1963
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 10,887
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,323)
Unencumbered Apartment Communities [Member] | Mesa Village [Member] | Clairemont, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mesa Village [Member] | Clairemont, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mio [Member] | San Jose, CA [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				182
Gross amount carried at close of period [Abstract]
Land and improvements				11,012
Buildings and improvements				40,164
Total	$ 51,176			51,176
Accumulated depreciation	$ (1,363)			(1,363)
Date of construction	2015
Date acquired	Jan-16
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 51,176
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (1,363)
Unencumbered Apartment Communities [Member] | Mio [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mio [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mira Monte [Member] | Mira Mesa, CA [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				9,962
Gross amount carried at close of period [Abstract]
Land and improvements				7,186
Buildings and improvements				38,400
Total	$ 45,586			45,586
Accumulated depreciation	$ (20,783)			(20,783)
Date of construction	1982
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 45,586
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (20,783)
Unencumbered Apartment Communities [Member] | Mira Monte [Member] | Mira Mesa, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mira Monte [Member] | Mira Mesa, CA [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] | Los Angeles, CA [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				13,759
Gross amount carried at close of period [Abstract]
Land and improvements				7,886
Buildings and improvements				36,739
Total	$ 44,625			44,625
Accumulated depreciation	$ (22,818)			(22,818)
Date of construction	1988
Date acquired	Aug-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 44,625
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (22,818)
Unencumbered Apartment Communities [Member] | Miracle Mile Marbella [Member] | Los Angeles, CA [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] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mission Hills [Member] | Oceanside, CA [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				5,762
Gross amount carried at close of period [Abstract]
Land and improvements				10,167
Buildings and improvements				44,472
Total	$ 54,639			54,639
Accumulated depreciation	$ (18,507)			(18,507)
Date of construction	1984
Date acquired	Jul-05
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 54,639
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (18,507)
Unencumbered Apartment Communities [Member] | Mission Hills [Member] | Oceanside, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Mission Hills [Member] | Oceanside, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Mission Peaks [Member] | Fremont, CA [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				2,168
Gross amount carried at close of period [Abstract]
Land and improvements				46,499
Buildings and improvements				110,666
Total	$ 157,165			157,165
Accumulated depreciation	$ (11,305)			(11,305)
Date of construction	1995
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 157,165
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,305)
Unencumbered Apartment Communities [Member] | Mission Peaks [Member] | Fremont, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Mission Peaks [Member] | Fremont, CA [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] | Fremont, CA [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				3,170
Gross amount carried at close of period [Abstract]
Land and improvements				31,429
Buildings and improvements				76,504
Total	$ 107,933			107,933
Accumulated depreciation	$ (7,962)			(7,962)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 107,933
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,962)
Unencumbered Apartment Communities [Member] | Mission Peaks II [Member] | Fremont, CA [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] | Fremont, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Monterey Villas [Member] | Oxnard, CA [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				6,117
Gross amount carried at close of period [Abstract]
Land and improvements				2,424
Buildings and improvements				11,621
Total	$ 14,045			14,045
Accumulated depreciation	$ (6,834)			(6,834)
Date of construction	1974
Date acquired	Jul-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 14,045
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,834)
Unencumbered Apartment Communities [Member] | Monterey Villas [Member] | Oxnard, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Monterey Villas [Member] | Oxnard, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Muse [Member] | Los Angeles, CA [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				2,457
Gross amount carried at close of period [Abstract]
Land and improvements				7,823
Buildings and improvements				35,892
Total	$ 43,715			43,715
Accumulated depreciation	$ (9,961)			(9,961)
Date of construction	2011
Date acquired	Feb-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 43,715
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,961)
Unencumbered Apartment Communities [Member] | Muse [Member] | Hollywood, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Muse [Member] | Hollywood, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Museum Park [Member] | San Jose, CA [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				934
Gross amount carried at close of period [Abstract]
Land and improvements				13,864
Buildings and improvements				33,282
Total	$ 47,146			47,146
Accumulated depreciation	$ (3,438)			(3,438)
Date of construction	2002
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,146
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,438)
Unencumbered Apartment Communities [Member] | Museum Park [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Museum Park [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Paragon Apartments [Member] | Fremont, CA [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				589
Gross amount carried at close of period [Abstract]
Land and improvements				32,230
Buildings and improvements				77,909
Total	$ 110,139			110,139
Accumulated depreciation	$ (6,431)			(6,431)
Date of construction	2013
Date acquired	Jul-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 110,139
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,431)
Unencumbered Apartment Communities [Member] | Paragon Apartments [Member] | Fremont, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Paragon Apartments [Member] | Fremont, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park Catalina [Member] | Los Angeles, CA [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				2,785
Gross amount carried at close of period [Abstract]
Land and improvements				4,710
Buildings and improvements				21,624
Total	$ 26,334			26,334
Accumulated depreciation	$ (3,739)			(3,739)
Date of construction	2002
Date acquired	Jun-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 26,334
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,739)
Unencumbered Apartment Communities [Member] | Park Catalina [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Park Catalina [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park Viridian [Member] | Anaheim, CA [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				1,727
Gross amount carried at close of period [Abstract]
Land and improvements				15,894
Buildings and improvements				65,301
Total	$ 81,195			81,195
Accumulated depreciation	$ (6,673)			(6,673)
Date of construction	2008
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 81,195
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,673)
Unencumbered Apartment Communities [Member] | Park Viridian [Member] | Irvine, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Park Viridian [Member] | Irvine, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Park West [Member] | San Francisco, CA [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				11,278
Gross amount carried at close of period [Abstract]
Land and improvements				9,424
Buildings and improvements				33,266
Total	$ 42,690			42,690
Accumulated depreciation	$ (5,609)			(5,609)
Date of construction	1958
Date acquired	Sep-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 42,690
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,609)
Unencumbered Apartment Communities [Member] | Park West [Member] | San Francisco, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Park West [Member] | San Francisco, CA [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] | Mill Creek, WA [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				1,896
Gross amount carried at close of period [Abstract]
Land and improvements				10,680
Buildings and improvements				44,618
Total	$ 55,298			55,298
Accumulated depreciation	$ (4,667)			(4,667)
Date of construction	1989
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 55,298
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,667)
Unencumbered Apartment Communities [Member] | Parkwood at Mill Creek [Member] | Mill Creek, WA [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] | Mill Creek, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Pinehurst [Member] | Ventura, CA [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				519
Gross amount carried at close of period [Abstract]
Land and improvements				6
Buildings and improvements				2,224
Total	$ 2,230			2,230
Accumulated depreciation	$ (1,344)			(1,344)
Date of construction	1973
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 2,230
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (1,344)
Unencumbered Apartment Communities [Member] | Pinehurst [Member] | Ventura, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Pinehurst [Member] | Ventura, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	24 years
Unencumbered Apartment Communities [Member] | Pinnacle Sonata [Member] | Bothell, WA [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				1,911
Gross amount carried at close of period [Abstract]
Land and improvements				14,647
Buildings and improvements				60,497
Total	$ 75,144			75,144
Accumulated depreciation	$ (6,089)			(6,089)
Date of construction	2000
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 75,144
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,089)
Unencumbered Apartment Communities [Member] | Pinnacle Sonata [Member] | Bothell, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Pinnacle Sonata [Member] | Bothell, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Pointe at Cupertinoe [Member] | Cupertino, CA [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				11,631
Gross amount carried at close of period [Abstract]
Land and improvements				4,505
Buildings and improvements				29,236
Total	$ 33,741			33,741
Accumulated depreciation	$ (13,938)			(13,938)
Date of construction	1963
Date acquired	Aug-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 33,741
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (13,938)
Unencumbered Apartment Communities [Member] | Pinnacle At Cupertino [Member] | Cupertino, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Pinnacle At Cupertino [Member] | Cupertino, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Radius [Member] | Redwood City, CA [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				(39)
Gross amount carried at close of period [Abstract]
Land and improvements				11,702
Buildings and improvements				152,297
Total	$ 163,999			163,999
Accumulated depreciation	$ (14,159)			(14,159)
Date of construction	2015
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 163,999
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (14,159)
Unencumbered Apartment Communities [Member] | Radius [Member] | Redwood City, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Radius [Member] | Redwood City, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Reed Square [Member] | Sunnyvale, CA [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				7,788
Gross amount carried at close of period [Abstract]
Land and improvements				6,873
Buildings and improvements				23,825
Total	$ 30,698			30,698
Accumulated depreciation	$ (5,865)			(5,865)
Date of construction	1970
Date acquired	Jan-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,698
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,865)
Unencumbered Apartment Communities [Member] | Reed Square [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Reed Square [Member] | Sunnyvale, CA [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] | Encino, CA [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				3,066
Gross amount carried at close of period [Abstract]
Land and improvements				3,184
Buildings and improvements				15,803
Total	$ 18,987			18,987
Accumulated depreciation	$ (4,623)			(4,623)
Date of construction	1989
Date acquired	Dec-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 18,987
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,623)
Unencumbered Apartment Communities [Member] | Regency at Encino [Member] | Encino, CA [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] | Encino, CA [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] | Orange, CA [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				3,165
Gross amount carried at close of period [Abstract]
Land and improvements				27,870
Buildings and improvements				114,647
Total	$ 142,517			142,517
Accumulated depreciation	$ (11,618)			(11,618)
Date of construction	2007
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 142,517
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,618)
Unencumbered Apartment Communities [Member] | Renaissance at Uptown Orange [Member] | Orange, CA [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] | Orange, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Reveal [Member] | Woodland Hills, CA [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				854
Gross amount carried at close of period [Abstract]
Land and improvements				25,073
Buildings and improvements				122,168
Total	$ 147,241			147,241
Accumulated depreciation	$ (8,165)			(8,165)
Date of construction	2010
Date acquired	Apr-15
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 147,241
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,165)
Unencumbered Apartment Communities [Member] | The Reveal [Member] | Woodland Hills, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Reveal [Member] | Woodland Hills, CA [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] | Bothell, WA [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				1,781
Gross amount carried at close of period [Abstract]
Land and improvements				3,801
Buildings and improvements				13,180
Total	$ 16,981			16,981
Accumulated depreciation	$ (7,106)			(7,106)
Date of construction	2000
Date acquired	Oct-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 16,981
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,106)
Unencumbered Apartment Communities [Member] | Salmon Run at Perry Creek [Member] | Bothell, WA [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] | Bothell, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Sammamish View [Member] | Bellevue, WA [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				6,497
Gross amount carried at close of period [Abstract]
Land and improvements				3,331
Buildings and improvements				13,991
Total	$ 17,322			17,322
Accumulated depreciation	$ (11,078)			(11,078)
Date of construction	1986
Date acquired	Nov-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 17,322
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,078)
Unencumbered Apartment Communities [Member] | Sammamish View [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Sammamish View [Member] | Bellevue, WA [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] | San Jose, CA [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				9,052
Gross amount carried at close of period [Abstract]
Land and improvements				4,173
Buildings and improvements				68,013
Total	$ 72,186			72,186
Accumulated depreciation	$ (16,920)			(16,920)
Date of construction	2001
Date acquired	Jul-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 72,186
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (16,920)
Unencumbered Apartment Communities [Member] | 101 San Fernando [Member] | San Jose, CA [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] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | San Marcos [Member] | Richmond, CA [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				28,870
Gross amount carried at close of period [Abstract]
Land and improvements				22,866
Buildings and improvements				57,771
Total	$ 80,637			80,637
Accumulated depreciation	$ (26,023)			(26,023)
Date of construction	2003
Date acquired	Nov-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 80,637
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (26,023)
Unencumbered Apartment Communities [Member] | San Marcos [Member] | Richmond, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | San Marcos [Member] | Richmond, CA [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] | Los Angeles, CA [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				4,935
Gross amount carried at close of period [Abstract]
Land and improvements				9,582
Buildings and improvements				45,251
Total	$ 54,833			54,833
Accumulated depreciation	$ (10,633)			(10,633)
Date of construction	2004
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 54,833
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,633)
Unencumbered Apartment Communities [Member] | Santee Court/Santee Village [Member] | Los Angeles, CA [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] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Shadow Point [Member] | Spring Valley, CA [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				2,818
Gross amount carried at close of period [Abstract]
Land and improvements				2,820
Buildings and improvements				13,980
Total	$ 16,800			16,800
Accumulated depreciation	$ (6,781)			(6,781)
Date of construction	1983
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 16,800
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (6,781)
Unencumbered Apartment Communities [Member] | Shadow Point [Member] | Spring Valley, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Shadow Point [Member] | Spring Valley, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Shadowbrook [Member] | Redmond, WA [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				3,028
Gross amount carried at close of period [Abstract]
Land and improvements				19,292
Buildings and improvements				80,196
Total	$ 99,488			99,488
Accumulated depreciation	$ (8,197)			(8,197)
Date of construction	1986
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 99,488
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,197)
Unencumbered Apartment Communities [Member] | Shadowbrook [Member] | Redmond, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Shadowbrook [Member] | Redmond, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Slater 116 [Member] | Kirkland, WA [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				540
Gross amount carried at close of period [Abstract]
Land and improvements				7,379
Buildings and improvements				22,678
Total	$ 30,057			30,057
Accumulated depreciation	$ (2,621)			(2,621)
Date of construction	2013
Date acquired	Sep-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,057
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,621)
Unencumbered Apartment Communities [Member] | Slater 116 [Member] | Kirkland, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Slater 116 [Member] | Kirkland, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Solstice [Member] | Sunnyvale, CA [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				4,404
Gross amount carried at close of period [Abstract]
Land and improvements				34,444
Buildings and improvements				151,666
Total	$ 186,110			186,110
Accumulated depreciation	$ (17,915)			(17,915)
Date of construction	2014
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 186,110
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (17,915)
Unencumbered Apartment Communities [Member] | Solstice [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Solstice [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Stonehedge Village [Member] | Bothell, WA [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				5,889
Gross amount carried at close of period [Abstract]
Land and improvements				3,201
Buildings and improvements				18,458
Total	$ 21,659			21,659
Accumulated depreciation	$ (12,004)			(12,004)
Date of construction	1986
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 21,659
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,004)
Unencumbered Apartment Communities [Member] | Stonehedge Village [Member] | Bothell, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Stonehedge Village [Member] | Bothell, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Summit Park [Member] | San Diego, CA [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				5,523
Gross amount carried at close of period [Abstract]
Land and improvements				5,977
Buildings and improvements				29,175
Total	$ 35,152			35,152
Accumulated depreciation	$ (14,340)			(14,340)
Date of construction	1972
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 35,152
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (14,340)
Unencumbered Apartment Communities [Member] | Summit Park [Member] | San Diego, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Summit Park [Member] | San Diego, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Taylor 28 [Member] | Seattle, WA [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				648
Gross amount carried at close of period [Abstract]
Land and improvements				13,915
Buildings and improvements				58,348
Total	$ 72,263			72,263
Accumulated depreciation	$ (5,840)			(5,840)
Date of construction	2008
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 72,263
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,840)
Unencumbered Apartment Communities [Member] | Taylor 28 [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Taylor 28 [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Avery [Member] | Los Angeles, CA [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				105
Gross amount carried at close of period [Abstract]
Land and improvements				6,964
Buildings and improvements				30,027
Total	$ 36,991			36,991
Accumulated depreciation	$ (2,793)			(2,793)
Date of construction	2014
Date acquired	Mar-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 36,991
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,793)
Unencumbered Apartment Communities [Member] | The Cairns [Member] | Seattle, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units | apartment	100
Initial cost [Abstract]
Land				6,937
Buildings and improvements				20,679
Costs capitalized subsequent to acquisition				1,195
Gross amount carried at close of period [Abstract]
Land and improvements				6,939
Buildings and improvements				21,872
Total	$ 28,811			28,811
Accumulated depreciation	$ (7,191)			(7,191)
Date of construction	2006
Date acquired	Jun-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 28,811
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,191)
Unencumbered Apartment Communities [Member] | The Cairns [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Cairns [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Commons [Member] | Campbell, CA [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				5,378
Gross amount carried at close of period [Abstract]
Land and improvements				12,556
Buildings and improvements				34,684
Total	$ 47,240			47,240
Accumulated depreciation	$ (9,005)			(9,005)
Date of construction	1973
Date acquired	Jul-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 47,240
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,005)
Unencumbered Apartment Communities [Member] | The Commons [Member] | Campbell, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Commons [Member] | Campbell, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Grand [Member] | Oakland, CA [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				5,646
Gross amount carried at close of period [Abstract]
Land and improvements				4,531
Buildings and improvements				94,854
Total	$ 99,385			99,385
Accumulated depreciation	$ (27,586)			(27,586)
Date of construction	2009
Date acquired	Jan-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 99,385
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (27,586)
Unencumbered Apartment Communities [Member] | The Grand [Member] | Oakland, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Grand [Member] | Oakland, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Hallie [Member] | Pasadena, CA [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				51,281
Gross amount carried at close of period [Abstract]
Land and improvements				8,385
Buildings and improvements				49,892
Total	$ 58,277			58,277
Accumulated depreciation	$ (21,785)			(21,785)
Date of construction	1972
Date acquired	Apr-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 58,277
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (21,785)
Unencumbered Apartment Communities [Member] | The Hallie [Member] | Pasadena, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | The Hallie [Member] | Pasadena, CA [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] | Ventura, CA [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				4,648
Gross amount carried at close of period [Abstract]
Land and improvements				1,618
Buildings and improvements				8,512
Total	$ 10,130			10,130
Accumulated depreciation	$ (4,933)			(4,933)
Date of construction	1971
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 10,130
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,933)
Unencumbered Apartment Communities [Member] | The Lofts at Pinehurst [Member] | Ventura, CA [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] | Ventura, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | The Stuart [Member] | Pasadena, CA [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				1,857
Gross amount carried at close of period [Abstract]
Land and improvements				13,574
Buildings and improvements				56,155
Total	$ 69,729			69,729
Accumulated depreciation	$ (5,919)			(5,919)
Date of construction	2007
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 69,729
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,919)
Unencumbered Apartment Communities [Member] | The Stuart [Member] | Pasadena, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | The Stuart [Member] | Pasadena, CA [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] | Redmond, WA [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				2,992
Gross amount carried at close of period [Abstract]
Land and improvements				21,930
Buildings and improvements				90,712
Total	$ 112,642			112,642
Accumulated depreciation	$ (9,312)			(9,312)
Date of construction	1985
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 112,642
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,312)
Unencumbered Apartment Communities [Member] | The Trails of Redmond [Member] | Redmond, WA [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] | Redmond, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Tiffany Court [Member] | Los Angeles, CA [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				906
Gross amount carried at close of period [Abstract]
Land and improvements				6,949
Buildings and improvements				28,702
Total	$ 35,651			35,651
Accumulated depreciation	$ (2,902)			(2,902)
Date of construction	1987
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 35,651
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (2,902)
Unencumbered Apartment Communities [Member] | Tiffany Court [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Tiffany Court [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Trabucco Villas [Member] | Lake Forest, CA [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				2,707
Gross amount carried at close of period [Abstract]
Land and improvements				3,890
Buildings and improvements				11,095
Total	$ 14,985			14,985
Accumulated depreciation	$ (7,091)			(7,091)
Date of construction	1985
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 14,985
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (7,091)
Unencumbered Apartment Communities [Member] | Trabucco Villas [Member] | Lake Forest, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Trabucco Villas [Member] | Lake Forest, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Via [Member] | Sunnyvale, CA [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				1,792
Gross amount carried at close of period [Abstract]
Land and improvements				22,016
Buildings and improvements				84,046
Total	$ 106,062			106,062
Accumulated depreciation	$ (19,028)			(19,028)
Date of construction	2011
Date acquired	Jul-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 106,062
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (19,028)
Unencumbered Apartment Communities [Member] | Via [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Via [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Villa Siena [Member] | Costa Mesa, CA [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				3,627
Gross amount carried at close of period [Abstract]
Land and improvements				13,842
Buildings and improvements				58,994
Total	$ 72,836			72,836
Accumulated depreciation	$ (5,937)			(5,937)
Date of construction	1974
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 72,836
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (5,937)
Unencumbered Apartment Communities [Member] | Villa Siena [Member] | Costa Mesa, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Villa Siena [Member] | Costa Mesa, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Village Green [Member] | La Habra, CA [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				2,820
Gross amount carried at close of period [Abstract]
Land and improvements				6,488
Buildings and improvements				39,588
Total	$ 46,076			46,076
Accumulated depreciation	$ (4,132)			(4,132)
Date of construction	1971
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 46,076
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (4,132)
Unencumbered Apartment Communities [Member] | Village Green [Member] | La Habra, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | Village Green [Member] | La Habra, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Vista Belvedere [Member] | Tiburon, CA [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				8,205
Gross amount carried at close of period [Abstract]
Land and improvements				5,573
Buildings and improvements				20,106
Total	$ 25,679			25,679
Accumulated depreciation	$ (8,793)			(8,793)
Date of construction	1963
Date acquired	Aug-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 25,679
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (8,793)
Unencumbered Apartment Communities [Member] | Vista Belvedere [Member] | Tiburon, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Vista Belvedere [Member] | Tiburon, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Vox Apartments [Member] | Seattle, WA [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				79
Gross amount carried at close of period [Abstract]
Land and improvements				5,545
Buildings and improvements				16,714
Total	$ 22,259			22,259
Accumulated depreciation	$ (1,802)			(1,802)
Date of construction	2013
Date acquired	Oct-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 22,259
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (1,802)
Unencumbered Apartment Communities [Member] | Vox Apartments [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Vox Apartments [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Walnut Heights [Member] | Walnut, CA [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				4,269
Gross amount carried at close of period [Abstract]
Land and improvements				4,887
Buildings and improvements				23,408
Total	$ 28,295			28,295
Accumulated depreciation	$ (10,501)			(10,501)
Date of construction	1964
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 28,295
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,501)
Unencumbered Apartment Communities [Member] | Walnut Heights [Member] | Walnut, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Walnut Heights [Member] | Walnut, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Wharfside Pointe [Member] | Seattle, WA [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				11,286
Gross amount carried at close of period [Abstract]
Land and improvements				2,258
Buildings and improvements				18,293
Total	$ 20,551			20,551
Accumulated depreciation	$ (11,308)			(11,308)
Date of construction	1990
Date acquired	Jun-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 20,551
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (11,308)
Unencumbered Apartment Communities [Member] | Wharfside Pointe [Member] | Seattle, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Wharfside Pointe [Member] | Seattle, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Willow Lake [Member] | San Jose, CA [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				9,603
Gross amount carried at close of period [Abstract]
Land and improvements				43,194
Buildings and improvements				110,633
Total	$ 153,827			153,827
Accumulated depreciation	$ (17,032)			(17,032)
Date of construction	1989
Date acquired	Oct-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 153,827
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (17,032)
Unencumbered Apartment Communities [Member] | Willow Lake [Member] | San Jose, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Willow Lake [Member] | San Jose, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | 5600 Wilshire [Member] | Los Angeles, CA [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				1,004
Gross amount carried at close of period [Abstract]
Land and improvements				30,535
Buildings and improvements				92,608
Total	$ 123,143			123,143
Accumulated depreciation	$ (9,435)			(9,435)
Date of construction	2008
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 123,143
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (9,435)
Unencumbered Apartment Communities [Member] | 5600 Wilshire [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	5 years
Unencumbered Apartment Communities [Member] | 5600 Wilshire [Member] | Los Angeles, CA [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] | Los Angeles, CA [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				7,368
Gross amount carried at close of period [Abstract]
Land and improvements				56,932
Buildings and improvements				219,366
Total	$ 276,298			276,298
Accumulated depreciation	$ (25,646)			(25,646)
Date of construction	2014
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 276,298
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (25,646)
Unencumbered Apartment Communities [Member] | Wilshire La Brea [Member] | Los Angeles, CA [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] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Windsor Ridge [Member] | Sunnyvale, CA [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				15,508
Gross amount carried at close of period [Abstract]
Land and improvements				4,021
Buildings and improvements				25,819
Total	$ 29,840			29,840
Accumulated depreciation	$ (17,389)			(17,389)
Date of construction	1989
Date acquired	Mar-89
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 29,840
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (17,389)
Unencumbered Apartment Communities [Member] | Windsor Ridge [Member] | Sunnyvale, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Windsor Ridge [Member] | Sunnyvale, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Woodland Commons [Member] | Bellevue, WA [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				22,031
Gross amount carried at close of period [Abstract]
Land and improvements				2,044
Buildings and improvements				30,754
Total	$ 32,798			32,798
Accumulated depreciation	$ (16,605)			(16,605)
Date of construction	1978
Date acquired	Mar-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 32,798
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (16,605)
Unencumbered Apartment Communities [Member] | Woodland Commons [Member] | Bellevue, WA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Woodland Commons [Member] | Bellevue, WA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Unencumbered Apartment Communities [Member] | Woodside Village [Member] | Ventura, CA [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				3,751
Gross amount carried at close of period [Abstract]
Land and improvements				5,341
Buildings and improvements				24,777
Total	$ 30,118			30,118
Accumulated depreciation	$ (10,673)			$ (10,673)
Date of construction	1987
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 30,118
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (10,673)
Unencumbered Apartment Communities [Member] | Woodside Village [Member] | Ventura, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Unencumbered Apartment Communities [Member] | Woodside Village [Member] | Ventura, CA [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				140,564
Initial cost [Abstract]
Land				$ 13,279
Buildings and improvements				26,115
Costs capitalized subsequent to acquisition				4,063
Gross amount carried at close of period [Abstract]
Land and improvements				14,508
Buildings and improvements				28,949
Total	$ 43,457			43,457
Accumulated depreciation	(16,610)			$ (16,610)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	43,457
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	(16,610)
Other Property [Member] | Hollywood [Member] | Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of real estate property | ft²				34,000
Initial cost [Abstract]
Land				$ 10,200
Buildings and improvements				13,800
Costs capitalized subsequent to acquisition				14
Gross amount carried at close of period [Abstract]
Land and improvements				10,200
Buildings and improvements				13,814
Total	24,014			24,014
Accumulated depreciation	$ (3,934)			$ (3,934)
Date of construction	1938
Date acquired	Jul-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 24,014
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (3,934)
Other Property [Member] | Hollywood [Member] | Los Angeles, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Other Property [Member] | Hollywood [Member] | Los Angeles, CA [Member] | Maximum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Other Property [Member] | Derian Office Building [Member] | Irvine, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of real estate property | ft²				106,564
Initial cost [Abstract]
Land				$ 3,079
Buildings and improvements				12,315
Costs capitalized subsequent to acquisition				4,049
Gross amount carried at close of period [Abstract]
Land and improvements				4,308
Buildings and improvements				15,135
Total	$ 19,443			19,443
Accumulated depreciation	$ (12,676)			(12,676)
Date of construction	1983
Date acquired	Jul-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	$ 19,443
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	$ (12,676)
Other Property [Member] | Derian Office Building [Member] | Irvine, CA [Member] | Minimum [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Other Property [Member] | Derian Office Building [Member] | Irvine, CA [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	$ 12,331,469	11,244,681	5,443,757	$ 12,676,306	$ 11,244,681
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of year	12,331,469	11,244,681	5,443,757
Balance at the end of year	$ 12,676,306	$ 12,331,469	$ 11,244,681