Schedule III Real Estate and Accumulated Depreciation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance	$ 2,245,944,000
Initial cost [Abstract]
Land	2,404,712,000
Buildings and improvements	7,833,637,000
Costs capitalized subsequent to acquisition	1,448,533,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,486,094,000
Buildings and improvements	9,200,788,000
Total	11,686,882,000
Accumulated depreciation	(1,564,806,000)	(1,254,886,000)	(1,081,517,000)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Improvements	135,812,000	92,016,000	97,947,000
Acquisition of real estate	5,685,884,000	344,476,000	619,743,000
Development of real estate	19,751,000	14,111,000	25,545,000
Disposition of real estate	(32,693,000)	(40,518,000)	(22,627,000)
Balance at the end of year	11,686,882,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	1,254,886,000	1,081,517,000	920,026,000
Depreciation expense - Acquisitions	121,426,000	6,203,000	3,744,000
Depreciation expense - Discontinued operations	0	12,290,000	2,108,000
Depreciation expense - Rental properties	199,495,000	168,092,000	161,492,000
Dispositions	(11,001,000)	(13,216,000)	(5,853,000)
Balance at the end of year	1,564,806,000	1,254,886,000	1,081,517,000
Aggregate cost for federal income tax purpose	8,200,000,000
Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance	2,245,944,000
Initial cost [Abstract]
Land	825,606,000
Buildings and improvements	2,600,447,000
Costs capitalized subsequent to acquisition	423,644,000
Gross amount carried at close of period [Abstract]
Land and improvements	839,395,000
Buildings and improvements	3,010,302,000
Total	3,849,697,000
Accumulated depreciation	(665,234,000)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	3,849,697,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	665,234,000
Unencumbered Apartment Communities [Member]
Initial cost [Abstract]
Land	1,540,006,000
Buildings and improvements	5,192,199,000
Costs capitalized subsequent to acquisition	585,858,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,562,973,000
Buildings and improvements	5,755,090,000
Total	7,318,063,000
Accumulated depreciation	(873,388,000)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	7,318,063,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	873,388,000
Other Property [Member]
Initial cost [Abstract]
Land	21,152,000
Buildings and improvements	40,991,000
Costs capitalized subsequent to acquisition	22,608,000
Gross amount carried at close of period [Abstract]
Land and improvements	24,128,000
Buildings and improvements	60,623,000
Total	84,751,000
Accumulated depreciation	(23,730,000)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	84,751,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	23,730,000
Real Estate, Rental Property [Member]
Gross amount carried at close of period [Abstract]
Total	11,252,511,000	5,443,757,000	5,033,672,000	4,313,064,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of year				4,313,064,000
Balance at the end of year	11,252,511,000	5,443,757,000	5,033,672,000	4,313,064,000
Consolidated Development Pipeline [Member] | Other Property [Member]
Initial cost [Abstract]
Land	17,948,000
Buildings and improvements	0
Costs capitalized subsequent to acquisition	416,423,000
Gross amount carried at close of period [Abstract]
Land and improvements	59,598,000
Buildings and improvements	374,773,000
Total	434,371,000
Accumulated depreciation	(2,454,000)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	434,371,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	2,454,000
Mukilteo, WA [Member] | Elliot, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	301
Encumbrance	10,750,000
Initial cost [Abstract]
Land	2,498,000
Buildings and improvements	10,595,000
Costs capitalized subsequent to acquisition	14,371,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,824,000
Buildings and improvements	24,640,000
Total	27,464,000
Accumulated depreciation	(12,928,000)
Date of construction	1981
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	27,464,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	12,928,000
Woodland Hills, CA [Member] | Avondale at Warner Center [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	446
Encumbrance	45,349,000
Initial cost [Abstract]
Land	10,536,000
Buildings and improvements	24,522,000
Costs capitalized subsequent to acquisition	15,722,000
Gross amount carried at close of period [Abstract]
Land and improvements	10,601,000
Buildings and improvements	40,179,000
Total	50,780,000
Accumulated depreciation	(23,899,000)
Date of construction	1970
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	50,780,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	23,899,000
Newark, CA [Member] | Bridgeport [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	184
Encumbrance	21,003,000
Initial cost [Abstract]
Land	1,608,000
Buildings and improvements	7,582,000
Costs capitalized subsequent to acquisition	7,465,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,525,000
Buildings and improvements	15,130,000
Total	16,655,000
Accumulated depreciation	(11,592,000)
Date of construction	1987
Date acquired	Jul-87
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	16,655,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,592,000
Anaheim, CA [Member] | Barkley, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	161
Encumbrance	16,269,000
Initial cost [Abstract]
Land	0
Buildings and improvements	8,520,000
Costs capitalized subsequent to acquisition	5,195,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,353,000
Buildings and improvements	11,362,000
Total	13,715,000
Accumulated depreciation	(5,536,000)
Date of construction	1984
Date acquired	Apr-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	13,715,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,536,000
Anaheim, CA [Member] | Anavia [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	250
Initial cost [Abstract]
Land	15,925,000
Buildings and improvements	63,712,000
Costs capitalized subsequent to acquisition	5,968,000
Gross amount carried at close of period [Abstract]
Land and improvements	15,925,000
Buildings and improvements	69,680,000
Total	85,605,000
Accumulated depreciation	(9,491,000)
Date of construction	2009
Date acquired	Dec-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	85,605,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,491,000
San Ramon, CA [Member] | Bel Air [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	462
Encumbrance	53,835,000
Initial cost [Abstract]
Land	12,105,000
Buildings and improvements	18,252,000
Costs capitalized subsequent to acquisition	28,826,000
Gross amount carried at close of period [Abstract]
Land and improvements	12,682,000
Buildings and improvements	46,501,000
Total	59,183,000
Accumulated depreciation	(23,898,000)
Date of construction	1988
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	59,183,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	23,898,000
San Ramon, CA [Member] | Canyon Oaks [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	250
Encumbrance	28,101,000
Initial cost [Abstract]
Land	19,088,000
Buildings and improvements	44,473,000
Costs capitalized subsequent to acquisition	2,244,000
Gross amount carried at close of period [Abstract]
Land and improvements	19,088,000
Buildings and improvements	46,717,000
Total	65,805,000
Accumulated depreciation	(12,259,000)
Date of construction	2005
Date acquired	May-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	65,805,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	12,259,000
San Ramon, CA [Member] | Mill Creek at Windermere [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	400
Encumbrance	48,348,000
Initial cost [Abstract]
Land	29,551,000
Buildings and improvements	69,032,000
Costs capitalized subsequent to acquisition	2,974,000
Gross amount carried at close of period [Abstract]
Land and improvements	29,551,000
Buildings and improvements	72,006,000
Total	101,557,000
Accumulated depreciation	(17,916,000)
Date of construction	2005
Date acquired	Sep-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	101,557,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	17,916,000
San Ramon, CA [Member] | Foothill Gardens/Twin Creeks [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	176
Initial cost [Abstract]
Land	5,875,000
Buildings and improvements	13,992,000
Costs capitalized subsequent to acquisition	6,870,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,964,000
Buildings and improvements	20,773,000
Total	26,737,000
Accumulated depreciation	(11,064,000)
Date of construction	1985
Date acquired	Feb-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	26,737,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,064,000
Los Angeles, CA [Member] | Belmont Station [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	275
Encumbrance	30,045,000
Initial cost [Abstract]
Land	8,100,000
Buildings and improvements	66,666,000
Costs capitalized subsequent to acquisition	3,968,000
Gross amount carried at close of period [Abstract]
Land and improvements	8,267,000
Buildings and improvements	70,467,000
Total	78,734,000
Accumulated depreciation	(18,446,000)
Date of construction	2008
Date acquired	Dec-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	78,734,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	18,446,000
Los Angeles, CA [Member] | Avery, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	121
Encumbrance	10,000,000
Initial cost [Abstract]
Land	6,964,000
Buildings and improvements	29,922,000
Costs capitalized subsequent to acquisition	0
Gross amount carried at close of period [Abstract]
Land and improvements	6,964,000
Buildings and improvements	29,922,000
Total	36,886,000
Accumulated depreciation	(787,000)
Date of construction	2014
Date acquired	Mar-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	36,886,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	787,000
Los Angeles, CA [Member] | Bellerive [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	63
Initial cost [Abstract]
Land	5,401,000
Buildings and improvements	21,803,000
Costs capitalized subsequent to acquisition	629,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,401,000
Buildings and improvements	22,432,000
Total	27,833,000
Accumulated depreciation	(3,412,000)
Date of construction	2011
Date acquired	Aug-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	27,833,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,412,000
Los Angeles, CA [Member] | Bunker Hill [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	456
Initial cost [Abstract]
Land	11,498,000
Buildings and improvements	27,871,000
Costs capitalized subsequent to acquisition	21,173,000
Gross amount carried at close of period [Abstract]
Land and improvements	11,639,000
Buildings and improvements	48,903,000
Total	60,542,000
Accumulated depreciation	(19,993,000)
Date of construction	1968
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	60,542,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	19,993,000
Los Angeles, CA [Member] | Kings Road [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	196
Initial cost [Abstract]
Land	4,023,000
Buildings and improvements	9,527,000
Costs capitalized subsequent to acquisition	9,926,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,031,000
Buildings and improvements	19,445,000
Total	23,476,000
Accumulated depreciation	(9,944,000)
Date of construction	1979
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,476,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,944,000
Los Angeles, CA [Member] | Miracle Mile Marbella [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	236
Initial cost [Abstract]
Land	7,791,000
Buildings and improvements	23,075,000
Costs capitalized subsequent to acquisition	13,028,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,886,000
Buildings and improvements	36,008,000
Total	43,894,000
Accumulated depreciation	(19,131,000)
Date of construction	1988
Date acquired	Aug-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	43,894,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	19,131,000
Los Angeles, CA [Member] | Park Catalina [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	90
Initial cost [Abstract]
Land	4,710,000
Buildings and improvements	18,839,000
Costs capitalized subsequent to acquisition	1,781,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,710,000
Buildings and improvements	20,620,000
Total	25,330,000
Accumulated depreciation	(1,823,000)
Date of construction	2002
Date acquired	Jun-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	25,330,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,823,000
Los Angeles, CA [Member] | Santee Court [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	238
Initial cost [Abstract]
Land	9,581,000
Buildings and improvements	40,317,000
Costs capitalized subsequent to acquisition	2,726,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,582,000
Buildings and improvements	43,042,000
Total	52,624,000
Accumulated depreciation	(6,655,000)
Date of construction	2004
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	52,624,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,655,000
Los Angeles, CA [Member] | Essex Hollywood [Member] | Other Property [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of Real Estate Property	34,000
Initial cost [Abstract]
Land	10,200,000
Buildings and improvements	13,800,000
Costs capitalized subsequent to acquisition	2,402,000
Gross amount carried at close of period [Abstract]
Land and improvements	10,200,000
Buildings and improvements	16,202,000
Total	26,402,000
Accumulated depreciation	(5,262,000)
Date of construction	1938
Date acquired	Jul-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	26,402,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,262,000
San Jose, CA [Member] | Bella Villagio [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	231
Encumbrance	35,870,000
Initial cost [Abstract]
Land	17,247,000
Buildings and improvements	40,343,000
Costs capitalized subsequent to acquisition	1,983,000
Gross amount carried at close of period [Abstract]
Land and improvements	17,247,000
Buildings and improvements	42,326,000
Total	59,573,000
Accumulated depreciation	(6,432,000)
Date of construction	2004
Date acquired	Sep-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	59,573,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,432,000
San Jose, CA [Member] | Carlyle, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	132
Encumbrance	22,419,000
Initial cost [Abstract]
Land	3,954,000
Buildings and improvements	15,277,000
Costs capitalized subsequent to acquisition	10,147,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,801,000
Buildings and improvements	23,577,000
Total	29,378,000
Accumulated depreciation	(11,057,000)
Date of construction	2000
Date acquired	Apr-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	29,378,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,057,000
San Jose, CA [Member] | Esplanade [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	278
Encumbrance	42,950,000
Initial cost [Abstract]
Land	18,170,000
Buildings and improvements	40,086,000
Costs capitalized subsequent to acquisition	8,307,000
Gross amount carried at close of period [Abstract]
Land and improvements	18,429,000
Buildings and improvements	48,134,000
Total	66,563,000
Accumulated depreciation	(17,173,000)
Date of construction	2002
Date acquired	Apr-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	66,563,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	17,173,000
San Jose, CA [Member] | Waterford, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	238
Encumbrance	31,275,000
Initial cost [Abstract]
Land	11,808,000
Buildings and improvements	24,500,000
Costs capitalized subsequent to acquisition	12,916,000
Gross amount carried at close of period [Abstract]
Land and improvements	15,165,000
Buildings and improvements	34,059,000
Total	49,224,000
Accumulated depreciation	(16,320,000)
Date of construction	2000
Date acquired	Jun-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	49,224,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	16,320,000
San Jose, CA [Member] | 101 San Fernando [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	323
Initial cost [Abstract]
Land	4,173,000
Buildings and improvements	58,961,000
Costs capitalized subsequent to acquisition	6,876,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,173,000
Buildings and improvements	65,837,000
Total	70,010,000
Accumulated depreciation	(10,762,000)
Date of construction	2001
Date acquired	Jul-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	70,010,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,762,000
San Jose, CA [Member] | Willow Lake [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	508
Initial cost [Abstract]
Land	43,194,000
Buildings and improvements	101,030,000
Costs capitalized subsequent to acquisition	5,312,000
Gross amount carried at close of period [Abstract]
Land and improvements	43,194,000
Buildings and improvements	106,342,000
Total	149,536,000
Accumulated depreciation	(8,351,000)
Date of construction	1989
Date acquired	Oct-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	149,536,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,351,000
Sunnyvale, CA [Member] | Brookside Oaks [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	170
Encumbrance	19,312,000
Initial cost [Abstract]
Land	7,301,000
Buildings and improvements	16,310,000
Costs capitalized subsequent to acquisition	22,116,000
Gross amount carried at close of period [Abstract]
Land and improvements	10,328,000
Buildings and improvements	35,399,000
Total	45,727,000
Accumulated depreciation	(14,425,000)
Date of construction	1973
Date acquired	Jun-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	45,727,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	14,425,000
Sunnyvale, CA [Member] | Magnolia Square [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	188
Encumbrance	17,701,000
Initial cost [Abstract]
Land	8,190,000
Buildings and improvements	24,736,000
Costs capitalized subsequent to acquisition	14,056,000
Gross amount carried at close of period [Abstract]
Land and improvements	8,191,000
Buildings and improvements	38,791,000
Total	46,982,000
Accumulated depreciation	(10,633,000)
Date of construction	1969
Date acquired	Sep-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	46,982,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,633,000
Sunnyvale, CA [Member] | Montclaire, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	390
Encumbrance	45,833,000
Initial cost [Abstract]
Land	4,842,000
Buildings and improvements	19,776,000
Costs capitalized subsequent to acquisition	20,330,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,997,000
Buildings and improvements	39,951,000
Total	44,948,000
Accumulated depreciation	(31,729,000)
Date of construction	1973
Date acquired	Dec-88
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	44,948,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	31,729,000
Sunnyvale, CA [Member] | Summerhill Park [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	100
Encumbrance	13,326,000
Initial cost [Abstract]
Land	2,654,000
Buildings and improvements	4,918,000
Costs capitalized subsequent to acquisition	2,326,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,656,000
Buildings and improvements	7,242,000
Total	9,898,000
Accumulated depreciation	(5,133,000)
Date of construction	1988
Date acquired	Sep-88
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	9,898,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,133,000
Sunnyvale, CA [Member] | Bristol Commons [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	188
Initial cost [Abstract]
Land	5,278,000
Buildings and improvements	11,853,000
Costs capitalized subsequent to acquisition	4,993,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,293,000
Buildings and improvements	16,831,000
Total	22,124,000
Accumulated depreciation	(8,832,000)
Date of construction	1989
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	22,124,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,832,000
Sunnyvale, CA [Member] | Reed Square [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	100
Initial cost [Abstract]
Land	6,873,000
Buildings and improvements	16,037,000
Costs capitalized subsequent to acquisition	7,708,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,873,000
Buildings and improvements	23,745,000
Total	30,618,000
Accumulated depreciation	(2,853,000)
Date of construction	1970
Date acquired	Jan-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	30,618,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	2,853,000
Sunnyvale, CA [Member] | Via [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	284
Initial cost [Abstract]
Land	22,000,000
Buildings and improvements	82,270,000
Costs capitalized subsequent to acquisition	540,000
Gross amount carried at close of period [Abstract]
Land and improvements	22,016,000
Buildings and improvements	82,794,000
Total	104,810,000
Accumulated depreciation	(11,895,000)
Date of construction	2011
Date acquired	Jul-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	104,810,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,895,000
Sunnyvale, CA [Member] | Windsor Ridge [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	216
Initial cost [Abstract]
Land	4,017,000
Buildings and improvements	10,315,000
Costs capitalized subsequent to acquisition	14,104,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,021,000
Buildings and improvements	24,415,000
Total	28,436,000
Accumulated depreciation	(13,679,000)
Date of construction	1989
Date acquired	Mar-89
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	28,436,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	13,679,000
Camarillo, CA [Member] | Camino Ruiz Square [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	160
Encumbrance	21,110,000
Initial cost [Abstract]
Land	6,871,000
Buildings and improvements	26,119,000
Costs capitalized subsequent to acquisition	1,317,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,931,000
Buildings and improvements	27,376,000
Total	34,307,000
Accumulated depreciation	(7,498,000)
Date of construction	1990
Date acquired	Dec-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	34,307,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,498,000
Camarillo, CA [Member] | Camarillo Oaks [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	564
Initial cost [Abstract]
Land	10,953,000
Buildings and improvements	25,254,000
Costs capitalized subsequent to acquisition	3,984,000
Gross amount carried at close of period [Abstract]
Land and improvements	11,075,000
Buildings and improvements	29,116,000
Total	40,191,000
Accumulated depreciation	(17,860,000)
Date of construction	1985
Date acquired	Jul-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	40,191,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	17,860,000
Hayward, CA [Member] | City View [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	572
Encumbrance	74,903,000
Initial cost [Abstract]
Land	9,883,000
Buildings and improvements	37,670,000
Costs capitalized subsequent to acquisition	21,926,000
Gross amount carried at close of period [Abstract]
Land and improvements	10,350,000
Buildings and improvements	59,129,000
Total	69,479,000
Accumulated depreciation	(35,386,000)
Date of construction	1975
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	69,479,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	35,386,000
Bellevue, WA [Member] | Courtyard off Main [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	109
Encumbrance	15,757,000
Initial cost [Abstract]
Land	7,465,000
Buildings and improvements	21,405,000
Costs capitalized subsequent to acquisition	2,766,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,465,000
Buildings and improvements	24,171,000
Total	31,636,000
Accumulated depreciation	(3,701,000)
Date of construction	2000
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	31,636,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,701,000
Bellevue, WA [Member] | Palisades, The [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	192
Encumbrance	20,573,000
Initial cost [Abstract]
Land	1,560,000
Buildings and improvements	6,242,000
Costs capitalized subsequent to acquisition	11,006,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,565,000
Buildings and improvements	17,243,000
Total	18,808,000
Accumulated depreciation	(12,559,000)
Date of construction	1977
Date acquired	May-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	18,808,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	12,559,000
Bellevue, WA [Member] | Ellington [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	220
Encumbrance	23,279,000
Initial cost [Abstract]
Land	15,066,000
Buildings and improvements	45,249,000
Costs capitalized subsequent to acquisition	98,000
Gross amount carried at close of period [Abstract]
Land and improvements	15,066,000
Buildings and improvements	45,347,000
Total	60,413,000
Accumulated depreciation	(556,000)
Date of construction	1994
Date acquired	Jul-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	60,413,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	556,000
Bellevue, WA [Member] | Piedmont [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	396
Encumbrance	48,180,000
Initial cost [Abstract]
Land	19,848,000
Buildings and improvements	59,606,000
Costs capitalized subsequent to acquisition	1,557,000
Gross amount carried at close of period [Abstract]
Land and improvements	19,848,000
Buildings and improvements	61,163,000
Total	81,011,000
Accumulated depreciation	(1,288,000)
Date of construction	1969
Date acquired	May-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	81,011,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,288,000
Bellevue, WA [Member] | Cedar Terrace [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	180
Initial cost [Abstract]
Land	5,543,000
Buildings and improvements	16,442,000
Costs capitalized subsequent to acquisition	4,297,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,652,000
Buildings and improvements	20,630,000
Total	26,282,000
Accumulated depreciation	(7,810,000)
Date of construction	1984
Date acquired	Jan-05
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	26,282,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,810,000
Bellevue, WA [Member] | Emerald Ridge [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	180
Initial cost [Abstract]
Land	3,449,000
Buildings and improvements	7,801,000
Costs capitalized subsequent to acquisition	3,220,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,449,000
Buildings and improvements	11,021,000
Total	14,470,000
Accumulated depreciation	(7,768,000)
Date of construction	1987
Date acquired	Nov-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	14,470,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,768,000
Bellevue, WA [Member] | Foothill Commons [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	388
Initial cost [Abstract]
Land	2,435,000
Buildings and improvements	9,821,000
Costs capitalized subsequent to acquisition	35,126,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,440,000
Buildings and improvements	44,942,000
Total	47,382,000
Accumulated depreciation	(26,268,000)
Date of construction	1978
Date acquired	Mar-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	47,382,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	26,268,000
Bellevue, WA [Member] | Sammamish View [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	153
Initial cost [Abstract]
Land	3,324,000
Buildings and improvements	7,501,000
Costs capitalized subsequent to acquisition	6,035,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,331,000
Buildings and improvements	13,529,000
Total	16,860,000
Accumulated depreciation	(9,553,000)
Date of construction	1986
Date acquired	Nov-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	16,860,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,553,000
Bellevue, WA [Member] | Woodland Commons [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	302
Initial cost [Abstract]
Land	2,040,000
Buildings and improvements	8,727,000
Costs capitalized subsequent to acquisition	19,311,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,044,000
Buildings and improvements	28,034,000
Total	30,078,000
Accumulated depreciation	(12,937,000)
Date of construction	1978
Date acquired	Mar-90
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	30,078,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	12,937,000
Seattle, WA [Member] | Domaine [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	92
Encumbrance	15,793,000
Initial cost [Abstract]
Land	9,059,000
Buildings and improvements	27,177,000
Costs capitalized subsequent to acquisition	473,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,059,000
Buildings and improvements	27,650,000
Total	36,709,000
Accumulated depreciation	(2,151,000)
Date of construction	2009
Date acquired	Sep-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	36,709,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	2,151,000
Seattle, WA [Member] | The Bernard [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	63
Encumbrance	9,479,000
Initial cost [Abstract]
Land	3,699,000
Buildings and improvements	11,345,000
Costs capitalized subsequent to acquisition	171,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,689,000
Buildings and improvements	11,526,000
Total	15,215,000
Accumulated depreciation	(1,291,000)
Date of construction	2008
Date acquired	Sep-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	15,215,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,291,000
Seattle, WA [Member] | Collins On Pine [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	76
Initial cost [Abstract]
Land	7,276,000
Buildings and improvements	22,226,000
Costs capitalized subsequent to acquisition	7,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,276,000
Buildings and improvements	22,233,000
Total	29,509,000
Accumulated depreciation	(464,000)
Date of construction	2013
Date acquired	May-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	29,509,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	464,000
Seattle, WA [Member] | Annaliese [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	56
Initial cost [Abstract]
Land	4,727,000
Buildings and improvements	14,229,000
Costs capitalized subsequent to acquisition	153,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,726,000
Buildings and improvements	14,383,000
Total	19,109,000
Accumulated depreciation	(949,000)
Date of construction	2009
Date acquired	Jan-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	19,109,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	949,000
Seattle, WA [Member] | Cairns, The [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	100
Initial cost [Abstract]
Land	6,937,000
Buildings and improvements	20,679,000
Costs capitalized subsequent to acquisition	967,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,939,000
Buildings and improvements	21,644,000
Total	28,583,000
Accumulated depreciation	(5,498,000)
Date of construction	2006
Date acquired	Jun-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	28,583,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,498,000
Seattle, WA [Member] | Fountain Court [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	320
Initial cost [Abstract]
Land	6,702,000
Buildings and improvements	27,306,000
Costs capitalized subsequent to acquisition	9,252,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,585,000
Buildings and improvements	36,675,000
Total	43,260,000
Accumulated depreciation	(16,960,000)
Date of construction	2000
Date acquired	Mar-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	43,260,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	16,960,000
Seattle, WA [Member] | Joule [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	295
Initial cost [Abstract]
Land	14,558,000
Buildings and improvements	69,417,000
Costs capitalized subsequent to acquisition	3,366,000
Gross amount carried at close of period [Abstract]
Land and improvements	14,558,000
Buildings and improvements	72,783,000
Total	87,341,000
Accumulated depreciation	(13,492,000)
Date of construction	2010
Date acquired	Mar-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	87,341,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	13,492,000
Seattle, WA [Member] | Vox Apartments [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	58
Initial cost [Abstract]
Land	5,545,000
Buildings and improvements	16,635,000
Costs capitalized subsequent to acquisition	67,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,545,000
Buildings and improvements	16,702,000
Total	22,247,000
Accumulated depreciation	(674,000)
Date of construction	2013
Date acquired	Oct-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	22,247,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	674,000
Seattle, WA [Member] | Wharfside Pointe [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	142
Initial cost [Abstract]
Land	2,245,000
Buildings and improvements	7,020,000
Costs capitalized subsequent to acquisition	9,697,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,258,000
Buildings and improvements	16,704,000
Total	18,962,000
Accumulated depreciation	(8,780,000)
Date of construction	1990
Date acquired	Jun-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	18,962,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,780,000
Redmond, WA [Member] | Elevation [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	157
Encumbrance	11,308,000
Initial cost [Abstract]
Land	4,758,000
Buildings and improvements	14,285,000
Costs capitalized subsequent to acquisition	5,667,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,757,000
Buildings and improvements	19,953,000
Total	24,710,000
Accumulated depreciation	(4,178,000)
Date of construction	1986
Date acquired	Jun-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	24,710,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,178,000
Redmond, WA [Member] | Delano/Bon Terra [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	126
Initial cost [Abstract]
Land	7,470,000
Buildings and improvements	22,511,000
Costs capitalized subsequent to acquisition	911,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,470,000
Buildings and improvements	23,422,000
Total	30,892,000
Accumulated depreciation	(2,419,000)
Date of construction	2005
Date acquired	Dec-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	30,892,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	2,419,000
Santa Ana, CA [Member] | Fairhaven Treehouse [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	164
Encumbrance	20,721,000
Initial cost [Abstract]
Land	2,626,000
Buildings and improvements	10,485,000
Costs capitalized subsequent to acquisition	5,761,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,957,000
Buildings and improvements	15,915,000
Total	18,872,000
Accumulated depreciation	(6,850,000)
Date of construction	1970
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	18,872,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,850,000
Santa Ana, CA [Member] | Essex Skyline at MacAuthur Place [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	349
Initial cost [Abstract]
Land	21,537,000
Buildings and improvements	146,099,000
Costs capitalized subsequent to acquisition	1,846,000
Gross amount carried at close of period [Abstract]
Land and improvements	21,537,000
Buildings and improvements	147,945,000
Total	169,482,000
Accumulated depreciation	(13,566,000)
Date of construction	2008
Date acquired	Apr-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	169,482,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	13,566,000
Renton, WA [Member] | Fairwood Pond [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	194
Encumbrance	12,725,000
Initial cost [Abstract]
Land	5,296,000
Buildings and improvements	15,564,000
Costs capitalized subsequent to acquisition	2,232,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,297,000
Buildings and improvements	17,795,000
Total	23,092,000
Accumulated depreciation	(6,688,000)
Date of construction	1997
Date acquired	Oct-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,092,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,688,000
Renton, WA [Member] | Brighton Ridge [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	264
Initial cost [Abstract]
Land	2,623,000
Buildings and improvements	10,800,000
Costs capitalized subsequent to acquisition	4,070,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,656,000
Buildings and improvements	14,837,000
Total	17,493,000
Accumulated depreciation	(8,809,000)
Date of construction	1986
Date acquired	Dec-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	17,493,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,809,000
Renton, WA [Member] | Forest View [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	192
Initial cost [Abstract]
Land	3,731,000
Buildings and improvements	14,530,000
Costs capitalized subsequent to acquisition	1,530,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,731,000
Buildings and improvements	16,060,000
Total	19,791,000
Accumulated depreciation	(6,358,000)
Date of construction	1998
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	19,791,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,358,000
Playa Vista, CA [Member] | Fountain Park [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	705
Encumbrance	83,179,000
Initial cost [Abstract]
Land	25,073,000
Buildings and improvements	94,980,000
Costs capitalized subsequent to acquisition	25,540,000
Gross amount carried at close of period [Abstract]
Land and improvements	25,203,000
Buildings and improvements	120,390,000
Total	145,593,000
Accumulated depreciation	(48,601,000)
Date of construction	2002
Date acquired	Feb-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	145,593,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	48,601,000
Santa Rosa, CA [Member] | Harvest Park [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	104
Encumbrance	10,241,000
Initial cost [Abstract]
Land	6,700,000
Buildings and improvements	15,479,000
Costs capitalized subsequent to acquisition	1,099,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,690,000
Buildings and improvements	16,588,000
Total	23,278,000
Accumulated depreciation	(4,693,000)
Date of construction	2004
Date acquired	Mar-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,278,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,693,000
Glendale, CA [Member] | Hampton Place Hampton Court [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	215
Encumbrance	20,616,000
Initial cost [Abstract]
Land	6,695,000
Buildings and improvements	16,753,000
Costs capitalized subsequent to acquisition	8,310,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,733,000
Buildings and improvements	25,025,000
Total	31,758,000
Accumulated depreciation	(11,951,000)
Date of construction	1970
Date acquired	Jun-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	31,758,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,951,000
Glendale, CA [Member] | 416 on Broadway [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	115
Initial cost [Abstract]
Land	8,557,000
Buildings and improvements	34,235,000
Costs capitalized subsequent to acquisition	1,543,000
Gross amount carried at close of period [Abstract]
Land and improvements	8,557,000
Buildings and improvements	35,778,000
Total	44,335,000
Accumulated depreciation	(5,115,000)
Date of construction	2009
Date acquired	Dec-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	44,335,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,115,000
Simi Valley, CA [Member] | Hidden Valley [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	324
Encumbrance	30,053,000
Initial cost [Abstract]
Land	14,174,000
Buildings and improvements	34,065,000
Costs capitalized subsequent to acquisition	2,063,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,674,000
Buildings and improvements	40,628,000
Total	50,302,000
Accumulated depreciation	(14,322,000)
Date of construction	2004
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	50,302,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	14,322,000
Simi Valley, CA [Member] | Meadowood [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	320
Initial cost [Abstract]
Land	7,852,000
Buildings and improvements	18,592,000
Costs capitalized subsequent to acquisition	6,654,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,898,000
Buildings and improvements	25,200,000
Total	33,098,000
Accumulated depreciation	(14,710,000)
Date of construction	1986
Date acquired	Nov-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	33,098,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	14,710,000
Rancho Palos Verdes, CA [Member] | Highridge [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	255
Encumbrance	44,807,000
Initial cost [Abstract]
Land	5,419,000
Buildings and improvements	18,347,000
Costs capitalized subsequent to acquisition	28,623,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,073,000
Buildings and improvements	46,316,000
Total	52,389,000
Accumulated depreciation	(23,162,000)
Date of construction	1972
Date acquired	May-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	52,389,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	23,162,000
Issaquah, WA [Member] | Highlands at Wynhaven [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	333
Encumbrance	32,212,000
Initial cost [Abstract]
Land	16,271,000
Buildings and improvements	48,932,000
Costs capitalized subsequent to acquisition	6,609,000
Gross amount carried at close of period [Abstract]
Land and improvements	16,271,000
Buildings and improvements	55,541,000
Total	71,812,000
Accumulated depreciation	(12,981,000)
Date of construction	2000
Date acquired	Aug-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	71,812,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	12,981,000
Issaquah, WA [Member] | Park Hill at Issaquah [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	245
Encumbrance	28,426,000
Initial cost [Abstract]
Land	7,284,000
Buildings and improvements	21,937,000
Costs capitalized subsequent to acquisition	3,733,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,284,000
Buildings and improvements	25,670,000
Total	32,954,000
Accumulated depreciation	(9,049,000)
Date of construction	1999
Date acquired	Feb-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	32,954,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,049,000
Newbury Park, CA [Member] | Hillcrest Park [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	608
Encumbrance	67,064,000
Initial cost [Abstract]
Land	15,318,000
Buildings and improvements	40,601,000
Costs capitalized subsequent to acquisition	16,690,000
Gross amount carried at close of period [Abstract]
Land and improvements	15,755,000
Buildings and improvements	56,854,000
Total	72,609,000
Accumulated depreciation	(29,850,000)
Date of construction	1973
Date acquired	Mar-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	72,609,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	29,850,000
Huntington Beach, CA [Member] | Huntington Breakers [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	342
Encumbrance	37,446,000
Initial cost [Abstract]
Land	9,306,000
Buildings and improvements	22,720,000
Costs capitalized subsequent to acquisition	13,803,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,315,000
Buildings and improvements	36,514,000
Total	45,829,000
Accumulated depreciation	(16,859,000)
Date of construction	1984
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	45,829,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	16,859,000
Huntington Beach, CA [Member] | The Huntington [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	276
Encumbrance	32,096,000
Initial cost [Abstract]
Land	10,374,000
Buildings and improvements	41,495,000
Costs capitalized subsequent to acquisition	2,594,000
Gross amount carried at close of period [Abstract]
Land and improvements	10,374,000
Buildings and improvements	44,089,000
Total	54,463,000
Accumulated depreciation	(3,980,000)
Date of construction	1975
Date acquired	Jun-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	54,463,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,980,000
Bothell, WA [Member] | Inglenook Court [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	224
Encumbrance	8,300,000
Initial cost [Abstract]
Land	3,467,000
Buildings and improvements	7,881,000
Costs capitalized subsequent to acquisition	6,418,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,474,000
Buildings and improvements	14,292,000
Total	17,766,000
Accumulated depreciation	(9,683,000)
Date of construction	1985
Date acquired	Oct-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	17,766,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,683,000
Bothell, WA [Member] | Stonehedge Village [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	196
Encumbrance	12,109,000
Initial cost [Abstract]
Land	3,167,000
Buildings and improvements	12,603,000
Costs capitalized subsequent to acquisition	5,064,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,201,000
Buildings and improvements	17,633,000
Total	20,834,000
Accumulated depreciation	(10,210,000)
Date of construction	1986
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	20,834,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,210,000
Bothell, WA [Member] | Canyon Pointe [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	250
Initial cost [Abstract]
Land	4,692,000
Buildings and improvements	18,288,000
Costs capitalized subsequent to acquisition	5,099,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,693,000
Buildings and improvements	23,386,000
Total	28,079,000
Accumulated depreciation	(9,143,000)
Date of construction	1990
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	28,079,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,143,000
Bothell, WA [Member] | Salmon Run at Perry Creek [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	132
Initial cost [Abstract]
Land	3,717,000
Buildings and improvements	11,483,000
Costs capitalized subsequent to acquisition	1,430,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,801,000
Buildings and improvements	12,829,000
Total	16,630,000
Accumulated depreciation	(6,057,000)
Date of construction	2000
Date acquired	Oct-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	16,630,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,057,000
Kirkland, WA [Member] | Montebello [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	248
Encumbrance	28,423,000
Initial cost [Abstract]
Land	13,857,000
Buildings and improvements	41,575,000
Costs capitalized subsequent to acquisition	3,500,000
Gross amount carried at close of period [Abstract]
Land and improvements	13,858,000
Buildings and improvements	45,074,000
Total	58,932,000
Accumulated depreciation	(4,057,000)
Date of construction	1996
Date acquired	Jul-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	58,932,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,057,000
Kirkland, WA [Member] | Ascent [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	90
Initial cost [Abstract]
Land	3,924,000
Buildings and improvements	11,862,000
Costs capitalized subsequent to acquisition	1,538,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,924,000
Buildings and improvements	13,400,000
Total	17,324,000
Accumulated depreciation	(1,143,000)
Date of construction	1988
Date acquired	Oct-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	17,324,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,143,000
Kirkland, WA [Member] | Bridle Trails [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	108
Initial cost [Abstract]
Land	1,500,000
Buildings and improvements	5,930,000
Costs capitalized subsequent to acquisition	5,474,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,531,000
Buildings and improvements	11,373,000
Total	12,904,000
Accumulated depreciation	(6,483,000)
Date of construction	1986
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	12,904,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,483,000
Kirkland, WA [Member] | Corbella at Juanita Bay [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	169
Initial cost [Abstract]
Land	5,801,000
Buildings and improvements	17,415,000
Costs capitalized subsequent to acquisition	2,008,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,801,000
Buildings and improvements	19,423,000
Total	25,224,000
Accumulated depreciation	(2,819,000)
Date of construction	1978
Date acquired	Nov-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	25,224,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	2,819,000
Kirkland, WA [Member] | Evergreen Heights [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	200
Initial cost [Abstract]
Land	3,566,000
Buildings and improvements	13,395,000
Costs capitalized subsequent to acquisition	4,426,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,649,000
Buildings and improvements	17,738,000
Total	21,387,000
Accumulated depreciation	(10,019,000)
Date of construction	1990
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	21,387,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,019,000
Kirkland, WA [Member] | Slater 116 [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	108
Initial cost [Abstract]
Land	7,379,000
Buildings and improvements	22,138,000
Costs capitalized subsequent to acquisition	322,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,379,000
Buildings and improvements	22,460,000
Total	29,839,000
Accumulated depreciation	(994,000)
Date of construction	2013
Date acquired	Sep-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	29,839,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	994,000
Garden Grove, CA [Member] | Montejo [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	124
Encumbrance	15,728,000
Initial cost [Abstract]
Land	1,925,000
Buildings and improvements	7,685,000
Costs capitalized subsequent to acquisition	2,509,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,194,000
Buildings and improvements	9,925,000
Total	12,119,000
Accumulated depreciation	(4,566,000)
Date of construction	1974
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	12,119,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,566,000
Long Beach, CA [Member] | Pathways [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	296
Encumbrance	37,046,000
Initial cost [Abstract]
Land	4,083,000
Buildings and improvements	16,757,000
Costs capitalized subsequent to acquisition	18,993,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,239,000
Buildings and improvements	33,594,000
Total	39,833,000
Accumulated depreciation	(24,284,000)
Date of construction	1975
Date acquired	Feb-91
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	39,833,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	24,284,000
Long Beach, CA [Member] | Marbrisa [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	202
Initial cost [Abstract]
Land	4,700,000
Buildings and improvements	18,605,000
Costs capitalized subsequent to acquisition	5,099,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,760,000
Buildings and improvements	23,644,000
Total	28,404,000
Accumulated depreciation	(9,508,000)
Date of construction	1987
Date acquired	Sep-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	28,404,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,508,000
Fremont, CA [Member] | Stevenson Place [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	200
Encumbrance	21,394,000
Initial cost [Abstract]
Land	996,000
Buildings and improvements	5,582,000
Costs capitalized subsequent to acquisition	7,314,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,001,000
Buildings and improvements	12,891,000
Total	13,892,000
Accumulated depreciation	(9,713,000)
Date of construction	1971
Date acquired	Apr-83
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	13,892,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,713,000
Fremont, CA [Member] | Paragon Apartments [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	301
Initial cost [Abstract]
Land	32,230,000
Buildings and improvements	77,320,000
Costs capitalized subsequent to acquisition	40,000
Gross amount carried at close of period [Abstract]
Land and improvements	32,230,000
Buildings and improvements	77,360,000
Total	109,590,000
Accumulated depreciation	(1,183,000)
Date of construction	2013
Date acquired	Jul-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	109,590,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,183,000
Fremont, CA [Member] | Boulevard [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	172
Initial cost [Abstract]
Land	3,520,000
Buildings and improvements	8,182,000
Costs capitalized subsequent to acquisition	10,690,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,580,000
Buildings and improvements	18,812,000
Total	22,392,000
Accumulated depreciation	(12,518,000)
Date of construction	1978
Date acquired	Jan-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	22,392,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	12,518,000
Oxnard, CA [Member] | Tierra Vista [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	404
Encumbrance	55,212,000
Initial cost [Abstract]
Land	13,652,000
Buildings and improvements	53,336,000
Costs capitalized subsequent to acquisition	3,863,000
Gross amount carried at close of period [Abstract]
Land and improvements	13,661,000
Buildings and improvements	57,190,000
Total	70,851,000
Accumulated depreciation	(20,787,000)
Date of construction	2001
Date acquired	Jan-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	70,851,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	20,787,000
Oxnard, CA [Member] | Mariners Place [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	105
Initial cost [Abstract]
Land	1,555,000
Buildings and improvements	6,103,000
Costs capitalized subsequent to acquisition	2,079,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,562,000
Buildings and improvements	8,175,000
Total	9,737,000
Accumulated depreciation	(4,213,000)
Date of construction	1987
Date acquired	May-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	9,737,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,213,000
Oxnard, CA [Member] | Monterey Villas [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	122
Initial cost [Abstract]
Land	2,349,000
Buildings and improvements	5,579,000
Costs capitalized subsequent to acquisition	5,669,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,424,000
Buildings and improvements	11,173,000
Total	13,597,000
Accumulated depreciation	(5,739,000)
Date of construction	1974
Date acquired	Jul-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	13,597,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,739,000
Fountain Valley, CA [Member] | Valley Park [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	160
Encumbrance	26,479,000
Initial cost [Abstract]
Land	3,361,000
Buildings and improvements	13,420,000
Costs capitalized subsequent to acquisition	3,516,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,761,000
Buildings and improvements	16,536,000
Total	20,297,000
Accumulated depreciation	(7,460,000)
Date of construction	1969
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	20,297,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,460,000
Placentia, CA [Member] | Villa Angelina [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	256
Encumbrance	32,674,000
Initial cost [Abstract]
Land	4,498,000
Buildings and improvements	17,962,000
Costs capitalized subsequent to acquisition	5,988,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,962,000
Buildings and improvements	23,486,000
Total	28,448,000
Accumulated depreciation	(9,902,000)
Date of construction	1970
Date acquired	Nov-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	28,448,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,902,000
Kent, WA [Member] | Wandering Creek [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	156
Encumbrance	5,300,000
Initial cost [Abstract]
Land	1,285,000
Buildings and improvements	4,980,000
Costs capitalized subsequent to acquisition	3,695,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,296,000
Buildings and improvements	8,664,000
Total	9,960,000
Accumulated depreciation	(5,853,000)
Date of construction	1986
Date acquired	Nov-95
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	9,960,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,853,000
Southern California [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	2,899
Encumbrance	424,041,000
Initial cost [Abstract]
Land	163,608,000
Buildings and improvements	659,448,000
Costs capitalized subsequent to acquisition	3,344,000
Gross amount carried at close of period [Abstract]
Land and improvements	163,608,000
Buildings and improvements	662,792,000
Total	826,400,000
Accumulated depreciation	(18,178,000)
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	826,400,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	18,178,000
Southern California [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	5,438
Initial cost [Abstract]
Land	368,894,000
Buildings and improvements	1,394,794,000
Costs capitalized subsequent to acquisition	12,180,000
Gross amount carried at close of period [Abstract]
Land and improvements	368,894,000
Buildings and improvements	1,406,974,000
Total	1,775,868,000
Accumulated depreciation	(39,591,000)
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	1,775,868,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	39,591,000
Northern California [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	1,074
Encumbrance	219,244,000
Initial cost [Abstract]
Land	170,747,000
Buildings and improvements	363,720,000
Costs capitalized subsequent to acquisition	1,383,000
Gross amount carried at close of period [Abstract]
Land and improvements	170,747,000
Buildings and improvements	365,103,000
Total	535,850,000
Accumulated depreciation	(10,149,000)
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	535,850,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,149,000
Northern California [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	3,265
Initial cost [Abstract]
Land	375,703,000
Buildings and improvements	944,881,000
Costs capitalized subsequent to acquisition	8,147,000
Gross amount carried at close of period [Abstract]
Land and improvements	375,703,000
Buildings and improvements	953,028,000
Total	1,328,731,000
Accumulated depreciation	(27,762,000)
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	1,328,731,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	27,762,000
Seattle Metro [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	1,111
Encumbrance	145,427,000
Initial cost [Abstract]
Land	64,301,000
Buildings and improvements	265,474,000
Costs capitalized subsequent to acquisition	1,703,000
Gross amount carried at close of period [Abstract]
Land and improvements	64,301,000
Buildings and improvements	267,177,000
Total	331,478,000
Accumulated depreciation	(7,304,000)
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	331,478,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,304,000
Seattle Metro [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	1,710
Initial cost [Abstract]
Land	80,464,000
Buildings and improvements	373,710,000
Costs capitalized subsequent to acquisition	1,958,000
Gross amount carried at close of period [Abstract]
Land and improvements	80,464,000
Buildings and improvements	375,668,000
Total	456,132,000
Accumulated depreciation	(10,461,000)
Date acquired	Apr-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	456,132,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,461,000
Milpitas, CA [Member] | Apex [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	366
Initial cost [Abstract]
Land	44,240,000
Buildings and improvements	103,251,000
Costs capitalized subsequent to acquisition	89,000
Gross amount carried at close of period [Abstract]
Land and improvements	44,240,000
Buildings and improvements	103,340,000
Total	147,580,000
Accumulated depreciation	(1,249,000)
Date of construction	2014
Date acquired	Aug-14
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	147,580,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,249,000
Valley Village, CA [Member] | Allegro [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	97
Initial cost [Abstract]
Land	5,869,000
Buildings and improvements	23,977,000
Costs capitalized subsequent to acquisition	1,385,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,869,000
Buildings and improvements	25,362,000
Total	31,231,000
Accumulated depreciation	(5,293,000)
Date of construction	2010
Date acquired	Oct-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	31,231,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,293,000
Alpine, CA [Member] | Alpine Village [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	301
Initial cost [Abstract]
Land	4,967,000
Buildings and improvements	19,728,000
Costs capitalized subsequent to acquisition	5,362,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,982,000
Buildings and improvements	25,075,000
Total	30,057,000
Accumulated depreciation	(10,302,000)
Date of construction	1971
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	30,057,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,302,000
Irvine, CA [Member] | Axis 2300 [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	115
Initial cost [Abstract]
Land	5,405,000
Buildings and improvements	33,585,000
Costs capitalized subsequent to acquisition	965,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,405,000
Buildings and improvements	34,550,000
Total	39,955,000
Accumulated depreciation	(7,071,000)
Date of construction	2010
Date acquired	Aug-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	39,955,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,071,000
Irvine, CA [Member] | 17461 Derian [Member] | Other Property [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of Real Estate Property	107,720
Initial cost [Abstract]
Land	3,079,000
Buildings and improvements	12,315,000
Costs capitalized subsequent to acquisition	6,862,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,909,000
Buildings and improvements	18,347,000
Total	22,256,000
Accumulated depreciation	(11,322,000)
Date of construction	1983
Date acquired	Jul-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	22,256,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,322,000
Belmont, CA [Member] | Belmont Terrace [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	71
Initial cost [Abstract]
Land	4,446,000
Buildings and improvements	10,290,000
Costs capitalized subsequent to acquisition	3,100,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,473,000
Buildings and improvements	13,363,000
Total	17,836,000
Accumulated depreciation	(4,706,000)
Date of construction	1974
Date acquired	Oct-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	17,836,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,706,000
San Francisco, CA [Member] | Bennett Lofts [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	165
Initial cost [Abstract]
Land	21,771,000
Buildings and improvements	50,800,000
Costs capitalized subsequent to acquisition	24,463,000
Gross amount carried at close of period [Abstract]
Land and improvements	28,371,000
Buildings and improvements	68,663,000
Total	97,034,000
Accumulated depreciation	(4,919,000)
Date of construction	2004
Date acquired	Dec-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	97,034,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,919,000
San Francisco, CA [Member] | Fox Plaza [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	443
Initial cost [Abstract]
Land	39,731,000
Buildings and improvements	92,706,000
Costs capitalized subsequent to acquisition	5,046,000
Gross amount carried at close of period [Abstract]
Land and improvements	39,731,000
Buildings and improvements	97,752,000
Total	137,483,000
Accumulated depreciation	(6,255,000)
Date of construction	1968
Date acquired	Feb-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	137,483,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,255,000
San Francisco, CA [Member] | Park West [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	126
Initial cost [Abstract]
Land	9,424,000
Buildings and improvements	21,988,000
Costs capitalized subsequent to acquisition	4,701,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,424,000
Buildings and improvements	26,689,000
Total	36,113,000
Accumulated depreciation	(2,120,000)
Date of construction	1958
Date acquired	Sep-12
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	36,113,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	2,120,000
Bonita, CA [Member] | Bonita Cedars [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	120
Initial cost [Abstract]
Land	2,496,000
Buildings and improvements	9,913,000
Costs capitalized subsequent to acquisition	1,985,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,503,000
Buildings and improvements	11,891,000
Total	14,394,000
Accumulated depreciation	(5,084,000)
Date of construction	1983
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	14,394,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,084,000
Fullerton, CA [Member] | Wilshire Promenade [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	149
Encumbrance	17,657,000
Initial cost [Abstract]
Land	3,118,000
Buildings and improvements	7,385,000
Costs capitalized subsequent to acquisition	7,493,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,797,000
Buildings and improvements	14,199,000
Total	17,996,000
Accumulated depreciation	(7,518,000)
Date of construction	1992
Date acquired	Jan-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	17,996,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,518,000
Fullerton, CA [Member] | Capri at Sunny Hills [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	100
Initial cost [Abstract]
Land	3,337,000
Buildings and improvements	13,320,000
Costs capitalized subsequent to acquisition	8,060,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,048,000
Buildings and improvements	20,669,000
Total	24,717,000
Accumulated depreciation	(9,439,000)
Date of construction	1961
Date acquired	Sep-01
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	24,717,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,439,000
Newcastle, WA [Member] | Castle Creek [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	216
Initial cost [Abstract]
Land	4,149,000
Buildings and improvements	16,028,000
Costs capitalized subsequent to acquisition	2,412,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,833,000
Buildings and improvements	17,756,000
Total	22,589,000
Accumulated depreciation	(10,781,000)
Date of construction	1997
Date acquired	Dec-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	22,589,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,781,000
Goleta, CA [Member] | CBC Apartments [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	239
Initial cost [Abstract]
Land	11,841,000
Buildings and improvements	45,320,000
Costs capitalized subsequent to acquisition	4,882,000
Gross amount carried at close of period [Abstract]
Land and improvements	11,906,000
Buildings and improvements	50,137,000
Total	62,043,000
Accumulated depreciation	(17,174,000)
Date of construction	1962
Date acquired	Jan-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	62,043,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	17,174,000
San Diego, CA [Member] | CentrePointe [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	224
Initial cost [Abstract]
Land	3,405,000
Buildings and improvements	7,743,000
Costs capitalized subsequent to acquisition	18,330,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,442,000
Buildings and improvements	26,036,000
Total	29,478,000
Accumulated depreciation	(9,454,000)
Date of construction	1974
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	29,478,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,454,000
San Diego, CA [Member] | Domain [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	379
Initial cost [Abstract]
Land	23,848,000
Buildings and improvements	95,394,000
Costs capitalized subsequent to acquisition	390,000
Gross amount carried at close of period [Abstract]
Land and improvements	23,848,000
Buildings and improvements	95,784,000
Total	119,632,000
Accumulated depreciation	(3,616,000)
Date of construction	2013
Date acquired	Nov-13
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	119,632,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,616,000
San Diego, CA [Member] | Summit Park [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	300
Initial cost [Abstract]
Land	5,959,000
Buildings and improvements	23,670,000
Costs capitalized subsequent to acquisition	4,392,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,977,000
Buildings and improvements	28,044,000
Total	34,021,000
Accumulated depreciation	(11,974,000)
Date of construction	1972
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	34,021,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,974,000
Santa Cruz, CA [Member] | Chestnut Street [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	96
Initial cost [Abstract]
Land	6,582,000
Buildings and improvements	15,689,000
Costs capitalized subsequent to acquisition	1,083,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,582,000
Buildings and improvements	16,772,000
Total	23,354,000
Accumulated depreciation	(3,894,000)
Date of construction	2002
Date acquired	Jul-08
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,354,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,894,000
Campbell, CA [Member] | The Commons [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	264
Initial cost [Abstract]
Land	12,555,000
Buildings and improvements	29,307,000
Costs capitalized subsequent to acquisition	4,484,000
Gross amount carried at close of period [Abstract]
Land and improvements	12,556,000
Buildings and improvements	33,790,000
Total	46,346,000
Accumulated depreciation	(5,920,000)
Date of construction	1973
Date acquired	Jul-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	46,346,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,920,000
Oceanside, CA [Member] | Country Villas [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	180
Initial cost [Abstract]
Land	4,174,000
Buildings and improvements	16,583,000
Costs capitalized subsequent to acquisition	2,954,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,187,000
Buildings and improvements	19,524,000
Total	23,711,000
Accumulated depreciation	(8,457,000)
Date of construction	1976
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,711,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,457,000
Oceanside, CA [Member] | Mission Hills [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	282
Initial cost [Abstract]
Land	10,099,000
Buildings and improvements	38,778,000
Costs capitalized subsequent to acquisition	4,446,000
Gross amount carried at close of period [Abstract]
Land and improvements	10,167,000
Buildings and improvements	43,156,000
Total	53,323,000
Accumulated depreciation	(15,073,000)
Date of construction	1984
Date acquired	Jul-05
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	53,323,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	15,073,000
Hemet, CA [Member] | Devonshire [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	276
Initial cost [Abstract]
Land	3,470,000
Buildings and improvements	13,786,000
Costs capitalized subsequent to acquisition	2,748,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,482,000
Buildings and improvements	16,522,000
Total	20,004,000
Accumulated depreciation	(7,166,000)
Date of construction	1988
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	20,004,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,166,000
Newport Beach, CA [Member] | Fairways [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	74
Initial cost [Abstract]
Land	0
Buildings and improvements	7,850,000
Costs capitalized subsequent to acquisition	6,107,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,000
Buildings and improvements	13,948,000
Total	13,957,000
Accumulated depreciation	(6,203,000)
Date of construction	1972
Date acquired	Jun-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	13,957,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,203,000
Berkeley, CA [Member] | Fourth & U [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	171
Initial cost [Abstract]
Land	8,879,000
Buildings and improvements	52,351,000
Costs capitalized subsequent to acquisition	2,336,000
Gross amount carried at close of period [Abstract]
Land and improvements	8,879,000
Buildings and improvements	54,687,000
Total	63,566,000
Accumulated depreciation	(9,859,000)
Date of construction	2010
Date acquired	Apr-10
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	63,566,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	9,859,000
La Habra, CA [Member] | Hillsborough Park [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	235
Initial cost [Abstract]
Land	6,291,000
Buildings and improvements	15,455,000
Costs capitalized subsequent to acquisition	1,785,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,272,000
Buildings and improvements	17,259,000
Total	23,531,000
Accumulated depreciation	(8,882,000)
Date of construction	1999
Date acquired	Sep-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,531,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,882,000
San Mateo, CA [Member] | Hillsdale Garden Apartments [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	697
Initial cost [Abstract]
Land	22,000,000
Buildings and improvements	94,681,000
Costs capitalized subsequent to acquisition	19,608,000
Gross amount carried at close of period [Abstract]
Land and improvements	22,000,000
Buildings and improvements	114,289,000
Total	136,289,000
Accumulated depreciation	(33,598,000)
Date of construction	1948
Date acquired	Sep-06
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	136,289,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	33,598,000
Santa Barbara, CA [Member] | Hope Ranch Collection [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	108
Initial cost [Abstract]
Land	4,078,000
Buildings and improvements	16,877,000
Costs capitalized subsequent to acquisition	2,461,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,208,000
Buildings and improvements	19,208,000
Total	23,416,000
Accumulated depreciation	(4,854,000)
Date of construction	1965
Date acquired	Mar-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,416,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,854,000
Santa Clara, CA [Member] | 1000 Kiely [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	121
Initial cost [Abstract]
Land	9,359,000
Buildings and improvements	21,845,000
Costs capitalized subsequent to acquisition	5,773,000
Gross amount carried at close of period [Abstract]
Land and improvements	9,359,000
Buildings and improvements	27,618,000
Total	36,977,000
Accumulated depreciation	(4,107,000)
Date of construction	1971
Date acquired	Mar-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	36,977,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,107,000
Santa Clara, CA [Member] | Le Parc Luxury Apartments [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	140
Initial cost [Abstract]
Land	3,090,000
Buildings and improvements	7,421,000
Costs capitalized subsequent to acquisition	10,906,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,092,000
Buildings and improvements	18,325,000
Total	21,417,000
Accumulated depreciation	(11,312,000)
Date of construction	1975
Date acquired	Feb-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	21,417,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	11,312,000
Santa Clara, CA [Member] | Marina Cove [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	292
Initial cost [Abstract]
Land	5,320,000
Buildings and improvements	16,431,000
Costs capitalized subsequent to acquisition	11,125,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,324,000
Buildings and improvements	27,552,000
Total	32,876,000
Accumulated depreciation	(16,710,000)
Date of construction	1974
Date acquired	Jun-94
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	32,876,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	16,710,000
Santa Clara, CA [Member] | Santa Clara Square retail [Member] | Other Property [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of Real Estate Property	138,915
Initial cost [Abstract]
Land	6,472,000
Buildings and improvements	11,704,000
Costs capitalized subsequent to acquisition	4,586,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,472,000
Buildings and improvements	16,290,000
Total	22,762,000
Accumulated depreciation	(3,665,000)
Date of construction	1970
Date acquired	Sep-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	22,762,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,665,000
Mill Creek,WA [Member] | The Laurels at Mill Creek [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	164
Initial cost [Abstract]
Land	1,559,000
Buildings and improvements	6,430,000
Costs capitalized subsequent to acquisition	5,237,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,595,000
Buildings and improvements	11,631,000
Total	13,226,000
Accumulated depreciation	(7,021,000)
Date of construction	1981
Date acquired	Dec-96
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	13,226,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	7,021,000
Ventura, CA [Member] | Lofts at Pinehurst, The [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	118
Initial cost [Abstract]
Land	1,570,000
Buildings and improvements	3,912,000
Costs capitalized subsequent to acquisition	4,463,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,618,000
Buildings and improvements	8,327,000
Total	9,945,000
Accumulated depreciation	(4,195,000)
Date of construction	1971
Date acquired	Jun-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	9,945,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	4,195,000
Ventura, CA [Member] | Pinehurst [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	28
Initial cost [Abstract]
Land	355,000
Buildings and improvements	1,356,000
Costs capitalized subsequent to acquisition	481,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,000
Buildings and improvements	2,186,000
Total	2,192,000
Accumulated depreciation	(943,000)
Date of construction	1973
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	2,192,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	943,000
Ventura, CA [Member] | Woodside Village [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	145
Initial cost [Abstract]
Land	5,331,000
Buildings and improvements	21,036,000
Costs capitalized subsequent to acquisition	3,384,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,341,000
Buildings and improvements	24,410,000
Total	29,751,000
Accumulated depreciation	(8,669,000)
Date of construction	1987
Date acquired	Dec-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	29,751,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,669,000
Marina Del Rey, CA [Member] | Mirabella [Member] | Encumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	188
Encumbrance	44,556,000
Initial cost [Abstract]
Land	6,180,000
Buildings and improvements	26,673,000
Costs capitalized subsequent to acquisition	13,877,000
Gross amount carried at close of period [Abstract]
Land and improvements	6,270,000
Buildings and improvements	40,460,000
Total	46,730,000
Accumulated depreciation	(17,813,000)
Date of construction	2000
Date acquired	May-00
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	46,730,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	17,813,000
Marina Del Rey, CA [Member] | Marina City Club [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	101
Initial cost [Abstract]
Land	0
Buildings and improvements	28,167,000
Costs capitalized subsequent to acquisition	22,885,000
Gross amount carried at close of period [Abstract]
Land and improvements	0
Buildings and improvements	51,052,000
Total	51,052,000
Accumulated depreciation	(14,347,000)
Date of construction	1971
Date acquired	Jan-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	51,052,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	14,347,000
Clairemont, CA [Member] | Mesa Village [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	133
Initial cost [Abstract]
Land	1,888,000
Buildings and improvements	7,498,000
Costs capitalized subsequent to acquisition	1,177,000
Gross amount carried at close of period [Abstract]
Land and improvements	1,894,000
Buildings and improvements	8,669,000
Total	10,563,000
Accumulated depreciation	(3,613,000)
Date of construction	1963
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	10,563,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,613,000
Mira Mesa, CA [Member] | Mira Monte [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	355
Initial cost [Abstract]
Land	7,165,000
Buildings and improvements	28,459,000
Costs capitalized subsequent to acquisition	8,766,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,186,000
Buildings and improvements	37,204,000
Total	44,390,000
Accumulated depreciation	(17,380,000)
Date of construction	1982
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	44,390,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	17,380,000
Pasadena, CA [Member] | Monterra del Mar/Rey/Sol [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	292
Initial cost [Abstract]
Land	2,202,000
Buildings and improvements	4,794,000
Costs capitalized subsequent to acquisition	37,612,000
Gross amount carried at close of period [Abstract]
Land and improvements	8,385,000
Buildings and improvements	36,223,000
Total	44,608,000
Accumulated depreciation	(14,718,000)
Date of construction	1972
Date acquired	Apr-99
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	44,608,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	14,718,000
Hollywood, CA [Member] | Muse [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	152
Initial cost [Abstract]
Land	7,822,000
Buildings and improvements	33,436,000
Costs capitalized subsequent to acquisition	1,748,000
Gross amount carried at close of period [Abstract]
Land and improvements	7,823,000
Buildings and improvements	35,183,000
Total	43,006,000
Accumulated depreciation	(6,717,000)
Date of construction	2011
Date acquired	Feb-11
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	43,006,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,717,000
Cupertino, CA [Member] | Pointe at Cupertino, The [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	116
Initial cost [Abstract]
Land	4,505,000
Buildings and improvements	17,605,000
Costs capitalized subsequent to acquisition	11,290,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,505,000
Buildings and improvements	28,895,000
Total	33,400,000
Accumulated depreciation	(10,003,000)
Date of construction	1963
Date acquired	Aug-98
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	33,400,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	10,003,000
Encino, CA [Member] | Regency at Encino [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	75
Initial cost [Abstract]
Land	3,184,000
Buildings and improvements	12,737,000
Costs capitalized subsequent to acquisition	2,202,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,184,000
Buildings and improvements	14,939,000
Total	18,123,000
Accumulated depreciation	(3,151,000)
Date of construction	1989
Date acquired	Dec-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	18,123,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,151,000
Richmond, CA [Member] | San Marcos [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	432
Initial cost [Abstract]
Land	15,563,000
Buildings and improvements	36,204,000
Costs capitalized subsequent to acquisition	26,908,000
Gross amount carried at close of period [Abstract]
Land and improvements	22,866,000
Buildings and improvements	55,809,000
Total	78,675,000
Accumulated depreciation	(21,628,000)
Date of construction	2003
Date acquired	Nov-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	78,675,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	21,628,000
Spring Valley, CA [Member] | Shadow Point [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	172
Initial cost [Abstract]
Land	2,812,000
Buildings and improvements	11,170,000
Costs capitalized subsequent to acquisition	1,950,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,820,000
Buildings and improvements	13,112,000
Total	15,932,000
Accumulated depreciation	(5,659,000)
Date of construction	1983
Date acquired	Dec-02
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	15,932,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	5,659,000
Oakland, CA [Member] | The Grand [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	243
Initial cost [Abstract]
Land	4,531,000
Buildings and improvements	89,208,000
Costs capitalized subsequent to acquisition	4,426,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,531,000
Buildings and improvements	93,634,000
Total	98,165,000
Accumulated depreciation	(21,286,000)
Date of construction	2009
Date acquired	Jan-09
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	98,165,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	21,286,000
Lake Forest, CA [Member] | Trabucco Villas [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	132
Initial cost [Abstract]
Land	3,638,000
Buildings and improvements	8,640,000
Costs capitalized subsequent to acquisition	2,451,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,890,000
Buildings and improvements	10,839,000
Total	14,729,000
Accumulated depreciation	(6,013,000)
Date of construction	1985
Date acquired	Oct-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	14,729,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,013,000
Tracy, CA [Member] | Tuscana [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	30
Initial cost [Abstract]
Land	2,828,000
Buildings and improvements	6,599,000
Costs capitalized subsequent to acquisition	165,000
Gross amount carried at close of period [Abstract]
Land and improvements	2,870,000
Buildings and improvements	6,722,000
Total	9,592,000
Accumulated depreciation	(1,708,000)
Date of construction	2007
Date acquired	Feb-07
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	9,592,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	1,708,000
Tiburon, CA [Member] | Vista Belvedere [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	76
Initial cost [Abstract]
Land	5,573,000
Buildings and improvements	11,901,000
Costs capitalized subsequent to acquisition	5,861,000
Gross amount carried at close of period [Abstract]
Land and improvements	5,573,000
Buildings and improvements	17,762,000
Total	23,335,000
Accumulated depreciation	(6,804,000)
Date of construction	1963
Date acquired	Aug-04
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	23,335,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	6,804,000
Walnut, CA [Member] | Walnut Heights [Member] | Unencumbered Apartment Communities [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	163
Initial cost [Abstract]
Land	4,858,000
Buildings and improvements	19,168,000
Costs capitalized subsequent to acquisition	3,645,000
Gross amount carried at close of period [Abstract]
Land and improvements	4,887,000
Buildings and improvements	22,784,000
Total	27,671,000
Accumulated depreciation	(8,553,000)
Date of construction	1964
Date acquired	Oct-03
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	27,671,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	8,553,000
Palo Alto, CA [Member] | 925/935 East Meadow [Member] | Other Property [Member]
Real Estate and Accumulated Depreciation [Line Items]
Area of Real Estate Property	39,600
Initial cost [Abstract]
Land	1,401,000
Buildings and improvements	3,172,000
Costs capitalized subsequent to acquisition	8,758,000
Gross amount carried at close of period [Abstract]
Land and improvements	3,547,000
Buildings and improvements	9,784,000
Total	13,331,000
Accumulated depreciation	(3,481,000)
Date of construction	1988
Date acquired	Nov-97
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the end of year	13,331,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the end of year	3,481,000
Minimum [Member] | Mukilteo, WA [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Woodland Hills, CA [Member] | Avondale at Warner Center [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Newark, CA [Member] | Bridgeport [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Anaheim, CA [Member] | Barkley, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Anaheim, CA [Member] | Anavia [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Ramon, CA [Member] | Bel Air [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Ramon, CA [Member] | Canyon Oaks [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Ramon, CA [Member] | Mill Creek at Windermere [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Ramon, CA [Member] | Foothill Gardens/Twin Creeks [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Belmont Station [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Avery, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Bellerive [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Bunker Hill [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Kings Road [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Miracle Mile Marbella [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Park Catalina [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Santee Court [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Los Angeles, CA [Member] | Essex Hollywood [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Jose, CA [Member] | Bella Villagio [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Jose, CA [Member] | Carlyle, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Jose, CA [Member] | Esplanade [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Jose, CA [Member] | Waterford, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Jose, CA [Member] | 101 San Fernando [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Jose, CA [Member] | Willow Lake [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Brookside Oaks [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Magnolia Square [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Montclaire, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Summerhill Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Bristol Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Reed Square [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Via [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Sunnyvale, CA [Member] | Windsor Ridge [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Camarillo, CA [Member] | Camino Ruiz Square [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Camarillo, CA [Member] | Camarillo Oaks [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Hayward, CA [Member] | City View [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Courtyard off Main [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Palisades, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Ellington [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Piedmont [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Cedar Terrace [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Emerald Ridge [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Foothill Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Sammamish View [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bellevue, WA [Member] | Woodland Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Domaine [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | The Bernard [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Collins On Pine [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Annaliese [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Cairns, The [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Fountain Court [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Joule [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Vox Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Seattle, WA [Member] | Wharfside Pointe [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Redmond, WA [Member] | Elevation [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Redmond, WA [Member] | Delano/Bon Terra [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Ana, CA [Member] | Fairhaven Treehouse [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Ana, CA [Member] | Essex Skyline at MacAuthur Place [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Renton, WA [Member] | Fairwood Pond [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Renton, WA [Member] | Brighton Ridge [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Renton, WA [Member] | Forest View [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Playa Vista, CA [Member] | Fountain Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Rosa, CA [Member] | Harvest Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Glendale, CA [Member] | Hampton Place Hampton Court [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Glendale, CA [Member] | 416 on Broadway [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Simi Valley, CA [Member] | Hidden Valley [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Simi Valley, CA [Member] | Meadowood [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Rancho Palos Verdes, CA [Member] | Highridge [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Issaquah, WA [Member] | Highlands at Wynhaven [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Issaquah, WA [Member] | Park Hill at Issaquah [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Newbury Park, CA [Member] | Hillcrest Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Huntington Beach, CA [Member] | Huntington Breakers [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Huntington Beach, CA [Member] | The Huntington [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bothell, WA [Member] | Inglenook Court [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bothell, WA [Member] | Stonehedge Village [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bothell, WA [Member] | Canyon Pointe [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bothell, WA [Member] | Salmon Run at Perry Creek [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kirkland, WA [Member] | Montebello [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kirkland, WA [Member] | Ascent [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kirkland, WA [Member] | Bridle Trails [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kirkland, WA [Member] | Corbella at Juanita Bay [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kirkland, WA [Member] | Evergreen Heights [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kirkland, WA [Member] | Slater 116 [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Garden Grove, CA [Member] | Montejo [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Long Beach, CA [Member] | Pathways [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Long Beach, CA [Member] | Marbrisa [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Fremont, CA [Member] | Stevenson Place [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Fremont, CA [Member] | Paragon Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Fremont, CA [Member] | Boulevard [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Oxnard, CA [Member] | Tierra Vista [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Oxnard, CA [Member] | Mariners Place [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Oxnard, CA [Member] | Monterey Villas [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Fountain Valley, CA [Member] | Valley Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Placentia, CA [Member] | Villa Angelina [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Kent, WA [Member] | Wandering Creek [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Southern California [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	1987
Life Used for Depreciation	3 years
Minimum [Member] | Southern California [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	1964
Life Used for Depreciation	5 years
Minimum [Member] | Northern California [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	1970
Life Used for Depreciation	3 years
Minimum [Member] | Northern California [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	1992
Life Used for Depreciation	5 years
Minimum [Member] | Seattle Metro [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	1992
Life Used for Depreciation	3 years
Minimum [Member] | Seattle Metro [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	1989
Life Used for Depreciation	5 years
Minimum [Member] | Milpitas, CA [Member] | Apex [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Valley Village, CA [Member] | Allegro [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Alpine, CA [Member] | Alpine Village [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Irvine, CA [Member] | Axis 2300 [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Irvine, CA [Member] | 17461 Derian [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Belmont, CA [Member] | Belmont Terrace [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Francisco, CA [Member] | Bennett Lofts [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Francisco, CA [Member] | Fox Plaza [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Francisco, CA [Member] | Park West [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Bonita, CA [Member] | Bonita Cedars [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Fullerton, CA [Member] | Wilshire Promenade [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Fullerton, CA [Member] | Capri at Sunny Hills [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Newcastle, WA [Member] | Castle Creek [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Goleta, CA [Member] | CBC Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Diego, CA [Member] | CentrePointe [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Diego, CA [Member] | Domain [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Diego, CA [Member] | Summit Park [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Cruz, CA [Member] | Chestnut Street [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Campbell, CA [Member] | The Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Oceanside, CA [Member] | Country Villas [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Oceanside, CA [Member] | Mission Hills [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Hemet, CA [Member] | Devonshire [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Newport Beach, CA [Member] | Fairways [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Berkeley, CA [Member] | Fourth & U [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | La Habra, CA [Member] | Hillsborough Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | La Habra, CA [Member] | Hillsborough Park [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | San Mateo, CA [Member] | Hillsdale Garden Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Barbara, CA [Member] | Hope Ranch Collection [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Clara, CA [Member] | 1000 Kiely [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Clara, CA [Member] | Le Parc Luxury Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Clara, CA [Member] | Marina Cove [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Santa Clara, CA [Member] | Santa Clara Square retail [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Mill Creek,WA [Member] | The Laurels at Mill Creek [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Ventura, CA [Member] | Lofts at Pinehurst, The [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Ventura, CA [Member] | Pinehurst [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Ventura, CA [Member] | Woodside Village [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Marina Del Rey, CA [Member] | Mirabella [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Marina Del Rey, CA [Member] | Marina City Club [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Clairemont, CA [Member] | Mesa Village [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Mira Mesa, CA [Member] | Mira Monte [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Pasadena, CA [Member] | Monterra del Mar/Rey/Sol [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Hollywood, CA [Member] | Muse [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Cupertino, CA [Member] | Pointe at Cupertino, The [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Encino, CA [Member] | Regency at Encino [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Richmond, CA [Member] | San Marcos [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Spring Valley, CA [Member] | Shadow Point [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Oakland, CA [Member] | The Grand [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Lake Forest, CA [Member] | Trabucco Villas [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Tracy, CA [Member] | Tuscana [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Tiburon, CA [Member] | Vista Belvedere [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Walnut, CA [Member] | Walnut Heights [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Palo Alto, CA [Member] | 925/935 East Meadow [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Minimum [Member] | Studio City, CA [Member] | Coldwater Canyon [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	3 years
Maximum [Member] | Mukilteo, WA [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Woodland Hills, CA [Member] | Avondale at Warner Center [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Newark, CA [Member] | Bridgeport [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Anaheim, CA [Member] | Barkley, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Anaheim, CA [Member] | Anavia [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Ramon, CA [Member] | Bel Air [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Ramon, CA [Member] | Canyon Oaks [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Ramon, CA [Member] | Mill Creek at Windermere [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Ramon, CA [Member] | Foothill Gardens/Twin Creeks [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Belmont Station [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Avery, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Bellerive [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Bunker Hill [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Kings Road [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Miracle Mile Marbella [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Park Catalina [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Santee Court [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Los Angeles, CA [Member] | Essex Hollywood [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Jose, CA [Member] | Bella Villagio [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Jose, CA [Member] | Carlyle, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Jose, CA [Member] | Esplanade [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Jose, CA [Member] | Waterford, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Jose, CA [Member] | 101 San Fernando [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Jose, CA [Member] | Willow Lake [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Brookside Oaks [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Magnolia Square [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Montclaire, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Summerhill Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Bristol Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Reed Square [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Via [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Sunnyvale, CA [Member] | Windsor Ridge [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Camarillo, CA [Member] | Camino Ruiz Square [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Camarillo, CA [Member] | Camarillo Oaks [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Hayward, CA [Member] | City View [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Courtyard off Main [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Palisades, The [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Ellington [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Piedmont [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Cedar Terrace [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Emerald Ridge [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Foothill Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Sammamish View [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bellevue, WA [Member] | Woodland Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Domaine [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | The Bernard [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Collins On Pine [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Annaliese [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Cairns, The [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Fountain Court [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Joule [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Vox Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Seattle, WA [Member] | Wharfside Pointe [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Redmond, WA [Member] | Elevation [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Redmond, WA [Member] | Delano/Bon Terra [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Ana, CA [Member] | Fairhaven Treehouse [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Ana, CA [Member] | Essex Skyline at MacAuthur Place [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Renton, WA [Member] | Fairwood Pond [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Renton, WA [Member] | Brighton Ridge [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Renton, WA [Member] | Forest View [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Playa Vista, CA [Member] | Fountain Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Rosa, CA [Member] | Harvest Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Glendale, CA [Member] | Hampton Place Hampton Court [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Glendale, CA [Member] | 416 on Broadway [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Simi Valley, CA [Member] | Hidden Valley [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Simi Valley, CA [Member] | Meadowood [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Rancho Palos Verdes, CA [Member] | Highridge [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Issaquah, WA [Member] | Highlands at Wynhaven [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Issaquah, WA [Member] | Park Hill at Issaquah [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Newbury Park, CA [Member] | Hillcrest Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Huntington Beach, CA [Member] | Huntington Breakers [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Huntington Beach, CA [Member] | The Huntington [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bothell, WA [Member] | Inglenook Court [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bothell, WA [Member] | Stonehedge Village [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bothell, WA [Member] | Canyon Pointe [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bothell, WA [Member] | Salmon Run at Perry Creek [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kirkland, WA [Member] | Montebello [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kirkland, WA [Member] | Ascent [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kirkland, WA [Member] | Bridle Trails [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kirkland, WA [Member] | Corbella at Juanita Bay [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kirkland, WA [Member] | Evergreen Heights [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kirkland, WA [Member] | Slater 116 [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Garden Grove, CA [Member] | Montejo [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Long Beach, CA [Member] | Pathways [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Long Beach, CA [Member] | Marbrisa [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Fremont, CA [Member] | Stevenson Place [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Fremont, CA [Member] | Paragon Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Fremont, CA [Member] | Boulevard [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Oxnard, CA [Member] | Tierra Vista [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Oxnard, CA [Member] | Mariners Place [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Oxnard, CA [Member] | Monterey Villas [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Fountain Valley, CA [Member] | Valley Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Placentia, CA [Member] | Villa Angelina [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Kent, WA [Member] | Wandering Creek [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Southern California [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	2008
Life Used for Depreciation	30 years
Maximum [Member] | Southern California [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	2010
Life Used for Depreciation	30 years
Maximum [Member] | Northern California [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	2010
Life Used for Depreciation	30 years
Maximum [Member] | Northern California [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	2014
Life Used for Depreciation	30 years
Maximum [Member] | Seattle Metro [Member] | BRE Properties, Inc. [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	2009
Life Used for Depreciation	30 years
Maximum [Member] | Seattle Metro [Member] | BRE Properties, Inc. [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Date of construction	2013
Life Used for Depreciation	30 years
Maximum [Member] | Milpitas, CA [Member] | Apex [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Valley Village, CA [Member] | Allegro [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Alpine, CA [Member] | Alpine Village [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Irvine, CA [Member] | Axis 2300 [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Irvine, CA [Member] | 17461 Derian [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Belmont, CA [Member] | Belmont Terrace [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Francisco, CA [Member] | Bennett Lofts [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Francisco, CA [Member] | Fox Plaza [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Francisco, CA [Member] | Park West [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Bonita, CA [Member] | Bonita Cedars [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Fullerton, CA [Member] | Wilshire Promenade [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Fullerton, CA [Member] | Capri at Sunny Hills [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Newcastle, WA [Member] | Castle Creek [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Goleta, CA [Member] | CBC Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Diego, CA [Member] | CentrePointe [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Diego, CA [Member] | Domain [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Diego, CA [Member] | Summit Park [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Cruz, CA [Member] | Chestnut Street [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Campbell, CA [Member] | The Commons [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Oceanside, CA [Member] | Country Villas [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Oceanside, CA [Member] | Mission Hills [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Hemet, CA [Member] | Devonshire [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Newport Beach, CA [Member] | Fairways [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Berkeley, CA [Member] | Fourth & U [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | La Habra, CA [Member] | Hillsborough Park [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | La Habra, CA [Member] | Hillsborough Park [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | San Mateo, CA [Member] | Hillsdale Garden Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Barbara, CA [Member] | Hope Ranch Collection [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Clara, CA [Member] | 1000 Kiely [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Clara, CA [Member] | Le Parc Luxury Apartments [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Clara, CA [Member] | Marina Cove [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Santa Clara, CA [Member] | Santa Clara Square retail [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Mill Creek,WA [Member] | The Laurels at Mill Creek [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Ventura, CA [Member] | Lofts at Pinehurst, The [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Ventura, CA [Member] | Pinehurst [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Ventura, CA [Member] | Woodside Village [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Marina Del Rey, CA [Member] | Mirabella [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Marina Del Rey, CA [Member] | Marina City Club [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Clairemont, CA [Member] | Mesa Village [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Mira Mesa, CA [Member] | Mira Monte [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Pasadena, CA [Member] | Monterra del Mar/Rey/Sol [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Hollywood, CA [Member] | Muse [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Cupertino, CA [Member] | Pointe at Cupertino, The [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Encino, CA [Member] | Regency at Encino [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Richmond, CA [Member] | San Marcos [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Spring Valley, CA [Member] | Shadow Point [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Oakland, CA [Member] | The Grand [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Lake Forest, CA [Member] | Trabucco Villas [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Tracy, CA [Member] | Tuscana [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Tiburon, CA [Member] | Vista Belvedere [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Walnut, CA [Member] | Walnut Heights [Member] | Unencumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Palo Alto, CA [Member] | 925/935 East Meadow [Member] | Commercial Buildings [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
Maximum [Member] | Studio City, CA [Member] | Coldwater Canyon [Member] | Encumbered Apartment Communities [Member]
Gross amount carried at close of period [Abstract]
Life Used for Depreciation	30 years
BRE Properties, Inc. [Member]
Gross amount carried at close of period [Abstract]
Business Combination, Provisional Information, Initial Accounting Incomplete, Rental Properties	$ 5,200,000,000