Investments in Partially Owned Entities (Details) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended									16 Months Ended					6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 San Norterra [Domain]	Jun. 30, 2014 Consolidated Development Projects Held for and or Under Development [Member]	Jun. 30, 2014 Consolidated Operating [Domain]	Jun. 30, 2014 Consolidated Total [Domain]	Jun. 30, 2014 Unconsolidated Development Projects Held for and or Under Development [Domain]	Jun. 30, 2014 Unconsolidated Completed, Not Stabilized [Domain]	Jun. 30, 2014 Unconsolidated Operating [Domain]	Jun. 30, 2014 Unconsolidated Total [Domain]	Jun. 30, 2014 Parc on Powell (formerly 1333 Powell) [Domain]	Jun. 30, 2014 Archstone Transaction [Member]	Mar. 31, 2013 Archstone Transaction [Member]	Jun. 30, 2014 Residual JV [Domain]	Jun. 30, 2014 East Palmetto Park [Domain]	Jun. 30, 2014 Wisconsin Place [Domain]	Jun. 30, 2014 San Norterra [Domain]	Jun. 30, 2014 Waterton Tenside [Domain]	Jun. 30, 2014 Parc on Powell (formerly 1333 Powell) [Domain]	Jun. 30, 2014 Joint Venture Partner [Member]	Jun. 30, 2014 Company's Portion [Member]	Jun. 30, 2014 Nexus Sawgrass [Member]	Jun. 30, 2014 Domain [Member]	Jun. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] San Norterra [Domain]	Jun. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Parc on Powell (formerly 1333 Powell) [Domain]
Investments In Partially Owned Entities (Textuals) [Abstract]
Liquidation Value Preferred Interests																$ 76,800,000
Business Acquisition, Percentage of Voting Interests Acquired																	60.00%		90.00%	75.00%
Joint Venture Partner Ownership Percentage	80.00%		80.00%													40.00%
Partially Owned Consolidated Units to be Developed																			377
Initial Basis of Real Estate, Consolidated																			20,200,000	198,500,000
Equity Method Investment, Ownership Percentage	20.00%		20.00%																		85.00%	20.00%	5.00%
Initial Basis of Real Estate, Unconsolidated																					16,900,000	5,100,000	2,100,000
Project Cost																					52,800,000		75,000,000			79,000,000	155,800,000
Maximum Debt Commitment																					34,800,000		39,500,000			48,700,000	98,600,000
Debt Instrument, Description of Variable Rate Basis							LIBOR plus 2.00%								LIBOR plus 2.25%
Debt Instrument, Basis Spread on Variable Rate			1.05%																									2.00%	2.25%
Debt Instrument, Maturity Date			May 01, 2061																		Jan. 06, 2015	Dec. 01, 2018	Aug. 14, 2015			Jan. 01, 2021	Jan. 01, 2022
Debt Instrument, Interest Rate, Stated Percentage																						3.66%				5.60%	5.75%
Partially Owned Unconsolidated Units To Be Developed																							176
Guarantor Obligations, Maximum Exposure															19,700,000								19,700,000
Proceeds From Distributions Received From Unconsolidated Subsidiaries			64,669,000	0												83,600,000
Preferred Interests			65,000,000																						39,000,000
Land purchase price																								57,900,000	76,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	265,400,000		265,400,000																					75,700,000	102,500,000
Investment in Joint Venture	327,900,000		327,900,000
Number of Joint Ventures	2		2
Partners Payments To Acquire Equity Method Investments			40,100,000
Partially Owned Property Balance Sheet Schedule
Number of Real Estate Properties	397		397					0	19	19	0	2	2	4
Number of Units in Real Estate Property	111,491		111,491					0	3,752	3,752	0	945	724	1,669						432	388	336
ASSETS
Real Estate Investment Property, at Cost	27,341,089,000		27,341,089,000		26,800,948,000			329,668,000	676,848,000	1,006,516,000	55,998,000	233,411,000	108,164,000	397,573,000
Real Estate Investment Property, Accumulated Depreciation	(5,170,438,000)		(5,170,438,000)		(4,807,709,000)			0	(183,571,000)	(183,571,000)	0	(6,693,000)	(7,136,000)	(13,829,000)
Investment in real estate, net	22,170,651,000		22,170,651,000		21,993,239,000			329,668,000	493,277,000	822,945,000	55,998,000	226,718,000	101,028,000	383,744,000
Cash and Cash Equivalents, at Carrying Value	76,132,000	152,564,000	76,132,000	152,564,000	53,534,000	612,590,000		4,488,000	14,125,000	18,613,000	454,000	2,830,000	1,582,000	4,866,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	142,318,000		142,318,000		178,526,000			0	53,209,000	53,209,000	0	0	0	0				147,600,000		56,500,000
Restricted Cash and Cash Equivalents	84,408,000		84,408,000		103,567,000			34,761,000	250,000	35,011,000	0	130,000	47,000	177,000
Deferred Finance Costs, Net	63,441,000		63,441,000		58,486,000			0	2,318,000	2,318,000	53,000	4,000	122,000	179,000
Other Assets	409,183,000		409,183,000		404,557,000			6,679,000	26,176,000	32,855,000	14,000	41,000	1,250,000	1,305,000
Total assets	22,991,402,000		22,991,402,000		22,834,545,000			375,596,000	589,355,000	964,951,000	56,519,000	229,723,000	104,029,000	390,271,000
LIABILITIES AND EQUITY
Secured Debt	5,158,091,000		5,158,091,000		5,174,166,000			0	360,305,000	360,305,000	21,982,000	145,016,000	63,305,000	230,303,000							33,000,000	30,300,000	22,000,000			48,600,000	96,400,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable	168,225,000		168,225,000		118,791,000			12,313,000	1,730,000	14,043,000	5,095,000	955,000	350,000	6,400,000
Interest Payable	78,389,000		78,389,000		78,309,000			0	1,265,000	1,265,000	43,000	687,000	42,000	772,000
Other Liabilities	331,662,000		331,662,000		347,748,000			140,000	1,252,000	1,392,000	0	244,000	1,046,000	1,290,000
Security Deposit Liability	74,508,000		74,508,000		71,592,000			0	1,916,000	1,916,000	0	279,000	140,000	419,000
Total liabilities	11,922,733,000		11,922,733,000		11,626,205,000			12,453,000	366,468,000	378,921,000	27,120,000	147,181,000	64,883,000	239,184,000
Noncontrolling Interests Partially Owned Properties	125,843,000		125,843,000		126,583,000			117,677,000	8,166,000	125,843,000	27,858,000	70,428,000	23,434,000	121,720,000										117,400,000
Parent Equity Interest								245,466,000	214,721,000	460,187,000	1,541,000	12,114,000	15,712,000	29,367,000
Total Equity Interest								363,143,000	222,887,000	586,030,000	29,399,000	82,542,000	39,146,000	151,087,000
Total liabilities and equity	22,991,402,000		22,991,402,000		22,834,545,000			375,596,000	589,355,000	964,951,000	56,519,000	229,723,000	104,029,000	390,271,000
Partially Owned Property Income Statement Schedule
Operating revenue	652,568,000	617,217,000	1,286,010,000	1,121,939,000				0	43,110,000	43,110,000	0	7,958,000	5,060,000	13,018,000
Operating Expenses								154,000	12,825,000	12,979,000	132,000	3,287,000	1,856,000	5,275,000
Gross Profit								(154,000)	30,285,000	30,131,000	(132,000)	4,671,000	3,204,000	7,743,000
Depreciation	190,136,000	323,304,000	375,303,000	519,526,000				0	10,768,000	10,768,000	0	5,299,000	2,039,000	7,338,000
General and Administrative Expense	13,752,000	16,085,000	31,328,000	32,580,000				(3,000)	26,000	23,000	0	1,000	122,000	123,000
Operating Income	228,304,000	63,977,000	427,556,000	168,223,000				(151,000)	19,491,000	19,340,000	(132,000)	(629,000)	1,043,000	282,000
Interest and Other Income	2,032,000	432,000	2,637,000	752,000				0	3,000	3,000	0	0	0	0
Other Nonoperating Income (Expense)								(76,000)	(32,000)	(108,000)	0	0	0	0
Interest:
Interest Expense, Debt	115,924,000	122,950,000	228,973,000	317,417,000				0	(7,788,000)	(7,788,000)	0	(3,864,000)	(926,000)	(4,790,000)
Amortization of Financing Costs	(3,134,000)	(4,353,000)	(5,926,000)	(11,301,000)				0	(177,000)	(177,000)	0	0	(7,000)	(7,000)
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net gain on sales of land parcels, discontinued operations and net gain on sales of real estate properties	109,745,000	(64,525,000)	193,104,000	(183,093,000)				(227,000)	11,497,000	11,270,000	(132,000)	(4,493,000)	110,000	(4,515,000)
Income and other tax (expense) benefit	(646,000)	(428,000)	(886,000)	(833,000)				0	(45,000)	(45,000)	0	(7,000)	0	(7,000)
(Loss) from investments in unconsolidated entities	(7,616,000)	(8,174,000)	(9,025,000)	(54,540,000)				0	(879,000)	(879,000)	0	0	0	0
Net income	$ 117,720,000	$ 336,732,000	$ 200,452,000	$ 1,397,766,000				$ (227,000)	$ 10,573,000	$ 10,346,000	$ (132,000)	$ (4,500,000)	$ 110,000	$ (4,522,000)