Investments in Partially Owned Entities (Details) (USD $)	3 Months Ended							12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 23, 2006
Investments In Partially Owned Entities (Textuals) [Abstract]
Joint Venture Partner Ownership Percentage								80.00%
Disposed Properties								94	35
Disposed Units								29,180	9,012
Variable Interest Entity, Consolidated, Carrying Amount, Assets								$ 5,000,000
Equity Method Investment, Ownership Percentage								20.00%
Debt Instrument, Interest Rate, Stated Percentage												3.85%
Debt Instrument, Maturity Date								Sep. 01, 2014
Preferred Interests								65,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				1,047,545,000				108,000,000	1,047,545,000
Investment in Joint Venture								292,600,000
Number of Joint Ventures								2
Partners Payments To Acquire Equity Method Investments								40,100,000
Partially Owned Property Balance Sheet Schedule
Partially Owned Consolidated Properties								19
Partially Owned Unconsolidated Properties								4
Partially Owned Consolidated Units								3,752
Partially Owned Unconsolidated Units								1,669
ASSETS
Real Estate Investment Property, at Cost				21,008,429,000				26,800,948,000	21,008,429,000
Real Estate Investment Property, Accumulated Depreciation				(4,912,221,000)				(4,807,709,000)	(4,912,221,000)
Investment in real estate, net				16,096,208,000				21,993,239,000	16,096,208,000
Cash and cash equivalents				612,590,000				53,534,000	612,590,000	383,921,000	431,408,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures				17,877,000				178,526,000	17,877,000
Restricted Cash and Cash Equivalents				250,442,000				103,567,000	250,442,000
Deferred financing costs, net				44,382,000				58,486,000	44,382,000
Other assets				170,372,000				404,557,000	170,372,000
Total assets				17,201,000,000				22,834,545,000	17,201,000,000
LIABILITIES AND EQUITY
Secured Debt				3,898,369,000				5,174,166,000	3,898,369,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable				38,372,000				118,791,000	38,372,000
Accrued interest payable				76,223,000				78,309,000	76,223,000
Other liabilities				304,518,000				347,748,000	304,518,000
Security Deposit Liability				66,988,000				71,592,000	66,988,000
Total liabilities				9,275,521,000				11,626,205,000	9,275,521,000
Noncontrolling Interests - Partially Owned Properties				77,688,000				126,583,000	77,688,000
Total liabilities and equity				17,201,000,000				22,834,545,000	17,201,000,000
Partially Owned Property Income Statement Schedule
Operating revenue								2,387,702,000	1,747,502,000	1,525,220,000
Depreciation								978,973,000	560,669,000	506,175,000
General and Administrative Expense								62,179,000	47,233,000	43,604,000
Operating income	120,396,000	63,977,000	104,246,000	148,247,000	142,020,000	121,745,000	102,110,000	512,288,000	514,122,000	406,509,000
Interest and Other Income								4,656,000	150,546,000	7,963,000
Interest:
Expense incurred, net								(586,854,000)	(455,236,000)	(460,172,000)
Amortization of Financing Costs								(22,197,000)	(21,295,000)	(16,616,000)
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								(121,076,000)	160,826,000	(76,452,000)
Income and other tax (expense) benefit								(1,169,000)	(514,000)	(706,000)
(Loss) from investments in unconsolidated entities due to operations								(4,159,000)	(14,000)	0
Net gain on sales of land parcels								12,227,000	0	4,217,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								2,036,505,000	548,278,000	826,489,000
Net income								1,905,353,000	881,204,000	935,197,000
Consolidated Development Projects Held for and or Under Development [Member]
Partially Owned Property Balance Sheet Schedule
Partially Owned Consolidated Properties								0
Partially Owned Consolidated Units								0
ASSETS
Real Estate Investment Property, at Cost								342,222,000
Real Estate Investment Property, Accumulated Depreciation								0
Investment in real estate, net								342,222,000
Cash and cash equivalents								4,704,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								0
Restricted Cash and Cash Equivalents								43,654,000
Deferred financing costs, net								0
Other assets								5,841,000
Total assets								396,421,000
LIABILITIES AND EQUITY
Secured Debt								0
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								21,569,000
Accrued interest payable								0
Other liabilities								1,157,000
Security Deposit Liability								10,000
Total liabilities								22,736,000
Noncontrolling Interests - Partially Owned Properties								114,245,000
Parent Equity Interest								259,440,000
Total Equity Interest								373,685,000
Total liabilities and equity								396,421,000
Partially Owned Property Income Statement Schedule
Operating revenue								231,000
Operating Expenses								741,000
Gross Profit								(510,000)
Depreciation								0
General and Administrative Expense								882,000
Operating income								(1,392,000)
Interest and Other Income								2,000
Other Nonoperating Income (Expense)								(503,000)
Interest:
Expense incurred, net								(2,000)
Amortization of Financing Costs								0
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								(1,895,000)
Income and other tax (expense) benefit								(11,000)
(Loss) from investments in unconsolidated entities due to operations								0
Net gain on sales of land parcels								(17,000)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								0
Net income								(1,923,000)
Consolidated Operating [Domain]
Partially Owned Property Balance Sheet Schedule
Partially Owned Consolidated Properties								19
Partially Owned Consolidated Units								3,752
ASSETS
Real Estate Investment Property, at Cost								673,957,000
Real Estate Investment Property, Accumulated Depreciation								(172,802,000)
Investment in real estate, net								501,155,000
Cash and cash equivalents								22,792,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								54,439,000
Restricted Cash and Cash Equivalents								220,000
Deferred financing costs, net								2,496,000
Other assets								26,899,000
Total assets								608,001,000
LIABILITIES AND EQUITY
Secured Debt								360,130,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								1,113,000
Accrued interest payable								1,283,000
Other liabilities								1,487,000
Security Deposit Liability								1,828,000
Total liabilities								365,841,000
Noncontrolling Interests - Partially Owned Properties								12,338,000
Parent Equity Interest								229,822,000
Total Equity Interest								242,160,000
Total liabilities and equity								608,001,000
Partially Owned Property Income Statement Schedule
Operating revenue								80,968,000
Operating Expenses								24,888,000
Gross Profit								56,080,000
Depreciation								31,824,000
General and Administrative Expense								93,000
Operating income								24,163,000
Interest and Other Income								3,000
Other Nonoperating Income (Expense)								(5,000)
Interest:
Expense incurred, net								(14,561,000)
Amortization of Financing Costs								(301,000)
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								9,299,000
Income and other tax (expense) benefit								(56,000)
(Loss) from investments in unconsolidated entities due to operations								(1,387,000)
Net gain on sales of land parcels								0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								26,673,000
Net income								34,529,000
Consolidated Total [Domain]
Partially Owned Property Balance Sheet Schedule
Partially Owned Consolidated Properties								19
Partially Owned Consolidated Units								3,752
ASSETS
Real Estate Investment Property, at Cost								1,016,179,000
Real Estate Investment Property, Accumulated Depreciation								(172,802,000)
Investment in real estate, net								843,377,000
Cash and cash equivalents								27,496,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								54,439,000
Restricted Cash and Cash Equivalents								43,874,000
Deferred financing costs, net								2,496,000
Other assets								32,740,000
Total assets								1,004,422,000
LIABILITIES AND EQUITY
Secured Debt								360,130,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								22,682,000
Accrued interest payable								1,283,000
Other liabilities								2,644,000
Security Deposit Liability								1,838,000
Total liabilities								388,577,000
Noncontrolling Interests - Partially Owned Properties								126,583,000
Parent Equity Interest								489,262,000
Total Equity Interest								615,845,000
Total liabilities and equity								1,004,422,000
Partially Owned Property Income Statement Schedule
Operating revenue								81,199,000
Operating Expenses								25,629,000
Gross Profit								55,570,000
Depreciation								31,824,000
General and Administrative Expense								975,000
Operating income								22,771,000
Interest and Other Income								5,000
Other Nonoperating Income (Expense)								(508,000)
Interest:
Expense incurred, net								(14,563,000)
Amortization of Financing Costs								(301,000)
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								7,404,000
Income and other tax (expense) benefit								(67,000)
(Loss) from investments in unconsolidated entities due to operations								(1,387,000)
Net gain on sales of land parcels								(17,000)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								26,673,000
Net income								32,606,000
Unconsolidated Development Projects Held for and or Under Development [Domain]
Partially Owned Property Balance Sheet Schedule
Partially Owned Unconsolidated Properties								0
Partially Owned Unconsolidated Units								0
ASSETS
Real Estate Investment Property, at Cost								45,123,000
Real Estate Investment Property, Accumulated Depreciation								0
Investment in real estate, net								45,123,000
Cash and cash equivalents								262,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								0
Restricted Cash and Cash Equivalents								0
Deferred financing costs, net								77,000
Other assets								0
Total assets								45,462,000
LIABILITIES AND EQUITY
Secured Debt								11,379,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								4,433,000
Accrued interest payable								23,000
Other liabilities								339,000
Security Deposit Liability								0
Total liabilities								16,174,000
Noncontrolling Interests - Partially Owned Properties								27,858,000
Parent Equity Interest								1,430,000
Total Equity Interest								29,288,000
Total liabilities and equity								45,462,000
Partially Owned Property Income Statement Schedule
Operating revenue								0
Operating Expenses								135,000
Gross Profit								(135,000)
Depreciation								0
General and Administrative Expense								0
Operating income								(135,000)
Interest and Other Income								0
Other Nonoperating Income (Expense)								0
Interest:
Expense incurred, net								0
Amortization of Financing Costs								0
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								(135,000)
Income and other tax (expense) benefit								0
(Loss) from investments in unconsolidated entities due to operations								0
Net gain on sales of land parcels								0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								0
Net income								(135,000)
Unconsolidated Completed, Not Stabilized [Domain]
Partially Owned Property Balance Sheet Schedule
Partially Owned Unconsolidated Properties								3
Partially Owned Unconsolidated Units								1,333
ASSETS
Real Estate Investment Property, at Cost								284,264,000
Real Estate Investment Property, Accumulated Depreciation								(1,887,000)
Investment in real estate, net								282,377,000
Cash and cash equivalents								1,505,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								0
Restricted Cash and Cash Equivalents								95,000
Deferred financing costs, net								129,000
Other assets								355,000
Total assets								284,461,000
LIABILITIES AND EQUITY
Secured Debt								172,279,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								3,844,000
Accrued interest payable								693,000
Other liabilities								572,000
Security Deposit Liability								222,000
Total liabilities								177,610,000
Noncontrolling Interests - Partially Owned Properties								73,902,000
Parent Equity Interest								32,949,000
Total Equity Interest								106,851,000
Total liabilities and equity								284,461,000
Partially Owned Property Income Statement Schedule
Operating revenue								6,629,000
Operating Expenses								3,554,000
Gross Profit								3,075,000
Depreciation								1,887,000
General and Administrative Expense								53,000
Operating income								1,135,000
Interest and Other Income								0
Other Nonoperating Income (Expense)								0
Interest:
Expense incurred, net								(1,886,000)
Amortization of Financing Costs								0
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								(751,000)
Income and other tax (expense) benefit								0
(Loss) from investments in unconsolidated entities due to operations								0
Net gain on sales of land parcels								0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								0
Net income								(751,000)
Unconsolidated Operating [Domain]
Partially Owned Property Balance Sheet Schedule
Partially Owned Unconsolidated Properties								1
Partially Owned Unconsolidated Units								336
ASSETS
Real Estate Investment Property, at Cost								55,545,000
Real Estate Investment Property, Accumulated Depreciation								(4,605,000)
Investment in real estate, net								50,940,000
Cash and cash equivalents								1,377,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								0
Restricted Cash and Cash Equivalents								47,000
Deferred financing costs, net								4,000
Other assets								871,000
Total assets								53,239,000
LIABILITIES AND EQUITY
Secured Debt								30,550,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								164,000
Accrued interest payable								0
Other liabilities								768,000
Security Deposit Liability								105,000
Total liabilities								31,587,000
Noncontrolling Interests - Partially Owned Properties								20,450,000
Parent Equity Interest								1,202,000
Total Equity Interest								21,652,000
Total liabilities and equity								53,239,000
Partially Owned Property Income Statement Schedule
Operating revenue								4,597,000
Operating Expenses								1,949,000
Gross Profit								2,648,000
Depreciation								4,605,000
General and Administrative Expense								201,000
Operating income								(2,158,000)
Interest and Other Income								10,000
Other Nonoperating Income (Expense)								0
Interest:
Expense incurred, net								(941,000)
Amortization of Financing Costs								(1,000)
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								(3,090,000)
Income and other tax (expense) benefit								0
(Loss) from investments in unconsolidated entities due to operations								0
Net gain on sales of land parcels								0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								0
Net income								(3,090,000)
Unconsolidated Total [Domain]
Partially Owned Property Balance Sheet Schedule
Partially Owned Unconsolidated Properties								4
Partially Owned Unconsolidated Units								1,669
ASSETS
Real Estate Investment Property, at Cost								384,932,000
Real Estate Investment Property, Accumulated Depreciation								(6,492,000)
Investment in real estate, net								378,440,000
Cash and cash equivalents								3,144,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								0
Restricted Cash and Cash Equivalents								142,000
Deferred financing costs, net								210,000
Other assets								1,226,000
Total assets								383,162,000
LIABILITIES AND EQUITY
Secured Debt								214,208,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable								8,441,000
Accrued interest payable								716,000
Other liabilities								1,679,000
Security Deposit Liability								327,000
Total liabilities								225,371,000
Noncontrolling Interests - Partially Owned Properties								122,210,000
Parent Equity Interest								35,581,000
Total Equity Interest								157,791,000
Total liabilities and equity								383,162,000
Partially Owned Property Income Statement Schedule
Operating revenue								11,226,000
Operating Expenses								5,638,000
Gross Profit								5,588,000
Depreciation								6,492,000
General and Administrative Expense								254,000
Operating income								(1,158,000)
Interest and Other Income								10,000
Other Nonoperating Income (Expense)								0
Interest:
Expense incurred, net								(2,827,000)
Amortization of Financing Costs								(1,000)
(Loss) income before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of unconsolidated entities and land parcels and discontinued operations								(3,976,000)
Income and other tax (expense) benefit								0
(Loss) from investments in unconsolidated entities due to operations								0
Net gain on sales of land parcels								0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								0
Net income								(3,976,000)
Residual JV [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Initial Basis of Real Estate, Unconsolidated								(113,600,000)
Joint Venture Partner [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Land purchase price								57,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets								75,700,000
LIABILITIES AND EQUITY
Noncontrolling Interests - Partially Owned Properties								111,700,000
Company's Portion [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Land purchase price								76,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets								102,500,000
Nexus Sawgrass [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Project Cost								80,000,000
Maximum Debt Commitment								48,700,000
Debt Instrument, Interest Rate, Stated Percentage								5.60%
Debt Instrument, Maturity Date								Jan. 01, 2021
LIABILITIES AND EQUITY
Secured Debt								47,600,000
Domain [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Project Cost								154,600,000
Maximum Debt Commitment								98,600,000
Debt Instrument, Interest Rate, Stated Percentage								5.75%
Debt Instrument, Maturity Date								Jan. 01, 2022
LIABILITIES AND EQUITY
Secured Debt								91,600,000
Archstone Transaction [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Liquidation Value Preferred Interests								89,000,000
Business Acquisition, Percentage of Voting Interests Acquired								60.00%
Joint Venture Partner Ownership Percentage								40.00%
Company's Portion [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Preferred Interests								39,000,000
Enclave at Wellington [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Business Acquisition, Percentage of Voting Interests Acquired								95.00%
Initial Basis of Real Estate, Consolidated								26,200,000
Partially Owned Consolidated Units To Be Developed								268
Project Cost								50,000,000
East Palmetto Park [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Business Acquisition, Percentage of Voting Interests Acquired								90.00%
Initial Basis of Real Estate, Consolidated								20,200,000
Partially Owned Consolidated Units To Be Developed								377
Wisconsin Place [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Business Acquisition, Percentage of Voting Interests Acquired								75.00%
Initial Basis of Real Estate, Consolidated								198,500,000
Partially Owned Property Balance Sheet Schedule
Partially Owned Consolidated Units								432
ASSETS
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures								56,500,000
San Norterra [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Project Cost								56,300,000
Partially Owned Unconsolidated Units To Be Developed								388
Equity Method Investment, Ownership Percentage								85.00%
Initial Basis of Real Estate, Unconsolidated								16,900,000
Maximum Debt Commitment								34,800,000
Debt Instrument, Maturity Date								Jan. 06, 2015
Debt Instrument, Description of Variable Rate Basis								LIBOR plus 2.00%
LIABILITIES AND EQUITY
Secured Debt								33,000,000
Waterton Tenside [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Equity Method Investment, Ownership Percentage								20.00%
Initial Basis of Real Estate, Unconsolidated								5,100,000
Debt Instrument, Interest Rate, Stated Percentage								3.66%
Debt Instrument, Maturity Date								Dec. 01, 2018
Partially Owned Property Balance Sheet Schedule
Partially Owned Unconsolidated Units								336
LIABILITIES AND EQUITY
Secured Debt								30,600,000
Parkside at Emeryville [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Project Cost								75,000,000
Partially Owned Unconsolidated Units To Be Developed								176
Equity Method Investment, Ownership Percentage								5.00%
Initial Basis of Real Estate, Unconsolidated								(2,100,000)
Maximum Debt Commitment								39,500,000
Debt Instrument, Maturity Date								Aug. 14, 2015
Unconsolidated Project Under Development Commitment Fund								19,700,000
Debt Instrument, Description of Variable Rate Basis								LIBOR plus 2.25%
LIABILITIES AND EQUITY
Secured Debt								11,400,000
Joint Venture Partner [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Disposed Properties									2
Disposed Units									441
Interest:
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax									$ 21,300,000
London Interbank Offered Rate (LIBOR) [Member]
Investments In Partially Owned Entities (Textuals) [Abstract]
Debt Instrument, Description of Variable Rate Basis								LIBOR plus 1.75%	LIBOR plus 0.50%
Debt Instrument, Basis Spread on Variable Rate								1.75%
London Interbank Offered Rate (LIBOR) [Member] | San Norterra [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Debt Instrument, Basis Spread on Variable Rate								2.00%
London Interbank Offered Rate (LIBOR) [Member] | Parkside at Emeryville [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Debt Instrument, Basis Spread on Variable Rate								2.25%