Investments in Partially Owned Entities (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended									7 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 San Norterra [Domain]	Sep. 30, 2014 Consolidated Development Projects Held for and or Under Development [Member]	Sep. 30, 2014 Consolidated Operating [Domain]	Sep. 30, 2014 Consolidated Total [Domain]	Sep. 30, 2014 Unconsolidated Development Projects Held for and or Under Development [Domain]	Sep. 30, 2014 Unconsolidated Completed, Not Stabilized [Domain]	Sep. 30, 2014 Unconsolidated Operating [Domain]	Sep. 30, 2014 Unconsolidated Total [Domain]	Sep. 30, 2014 Parc on Powell (formerly 1333 Powell) [Domain]	Sep. 30, 2014 Archstone Transaction [Member]	Mar. 31, 2013 Archstone Transaction [Member]	Sep. 30, 2014 Residual JV [Domain]	Sep. 30, 2014 Wisconsin Place [Domain]	Sep. 30, 2014 San Norterra [Domain]	Sep. 30, 2014 Waterton Tenside [Domain]	Sep. 30, 2014 Parc on Powell (formerly 1333 Powell) [Domain]	Sep. 30, 2014 Joint Venture Partner [Member]	Sep. 30, 2014 Company's Portion [Member]	Sep. 30, 2014 Nexus Sawgrass [Member]	Sep. 30, 2014 Domain [Member]	Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] San Norterra [Domain]	Sep. 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																$ 73,500,000
Business Acquisition, Percentage of Voting Interests Acquired																			75.00%
Joint Venture Partner Ownership Percentage	80.00%		80.00%														40.00%
Initial Basis of Real Estate, Consolidated																			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			78,600,000	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			77,042,000	25,471,000												95,900,000
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	404,400,000		404,400,000																				75,700,000	102,500,000
Investment in Joint Venture	331,800,000		331,800,000
Number of Joint Ventures	2		2
Partners Payments To Acquire Equity Method Investments			40,100,000
land parcel disposed			2																				1
Net gain on sales of real estate properties	113,641,000	0	128,544,000	0																			1,052,000
Partially Owned Property Balance Sheet Schedule
Number of Real Estate Properties	396		396					0	19	19	0	1	3	4
Number of Units in Real Estate Property	111,087		111,087					0	3,771	3,771	0	444	1,225	1,669					432	388	336
ASSETS
Real Estate Investment Property, at Cost	27,574,865,000		27,574,865,000		26,800,948,000			324,997,000	679,956,000	1,004,953,000	61,037,000	155,413,000	186,779,000	403,229,000
Real Estate Investment Property, Accumulated Depreciation	(5,314,260,000)		(5,314,260,000)		(4,807,709,000)			0	(189,005,000)	(189,005,000)	0	(5,313,000)	(12,185,000)	(17,498,000)
Investment in real estate, net	22,260,605,000		22,260,605,000		21,993,239,000			324,997,000	490,951,000	815,948,000	61,037,000	150,100,000	174,594,000	385,731,000
Cash and Cash Equivalents, at Carrying Value	31,478,000	972,761,000	31,478,000	972,761,000	53,534,000	612,590,000		2,953,000	15,820,000	18,773,000	66,000	1,975,000	4,486,000	6,527,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	128,100,000		128,100,000		178,526,000			0	52,641,000	52,641,000	0	0	0	0				147,600,000	56,500,000
Restricted Cash and Cash Equivalents	84,945,000		84,945,000		103,567,000			31,236,000	300,000	31,536,000	0	0	189,000	189,000
Deferred Finance Costs, Net	60,530,000		60,530,000		58,486,000			0	2,229,000	2,229,000	41,000	0	158,000	199,000
Other Assets	396,441,000		396,441,000		404,557,000			6,679,000	26,927,000	33,606,000	0	50,000	1,039,000	1,089,000
Total assets	23,008,094,000		23,008,094,000		22,834,545,000			365,865,000	588,868,000	954,733,000	61,144,000	152,125,000	180,466,000	393,735,000
LIABILITIES AND EQUITY
Secured Debt	5,090,960,000		5,090,960,000		5,174,166,000			0	360,392,000	360,392,000	25,631,000	96,793,000	111,800,000	234,224,000						33,000,000	30,100,000	25,600,000			48,600,000	96,800,000
Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable	203,070,000		203,070,000		118,791,000			16,707,000	3,217,000	19,924,000	5,730,000	456,000	1,467,000	7,653,000
Interest Payable	86,472,000		86,472,000		78,309,000			0	1,266,000	1,266,000	51,000	464,000	269,000	784,000
Other Liabilities	349,371,000		349,371,000		347,748,000			0	1,230,000	1,230,000	3,000	88,000	986,000	1,077,000
Security Deposit Liability	75,738,000		75,738,000		71,592,000			0	1,975,000	1,975,000	0	161,000	296,000	457,000
Total liabilities	11,860,523,000		11,860,523,000		11,626,205,000			16,707,000	368,080,000	384,787,000	31,415,000	97,962,000	114,818,000	244,195,000
Noncontrolling Interests Partially Owned Properties	125,197,000		125,197,000		126,583,000			117,351,000	7,846,000	125,197,000	27,858,000	47,223,000	46,639,000	121,720,000									117,400,000
Parent Equity Interest								231,807,000	212,942,000	444,749,000	1,871,000	6,940,000	19,009,000	27,820,000
Total Equity Interest								349,158,000	220,788,000	569,946,000	29,729,000	54,163,000	65,648,000	149,540,000
Total liabilities and equity	23,008,094,000		23,008,094,000		22,834,545,000			365,865,000	588,868,000	954,733,000	61,144,000	152,125,000	180,466,000	393,735,000
Partially Owned Property Income Statement Schedule
Operating revenue	664,078,000	626,629,000	1,950,088,000	1,748,568,000				0	65,565,000	65,565,000	0	6,874,000	14,499,000	21,373,000
Operating Expenses								0	19,390,000	19,390,000	159,000	2,486,000	5,442,000	8,087,000
Gross Profit								0	46,175,000	46,175,000	(159,000)	4,388,000	9,057,000	13,286,000
Depreciation	190,469,000	276,707,000	565,772,000	796,233,000				0	16,202,000	16,202,000	0	4,903,000	6,102,000	11,005,000
General and Administrative Expense	9,968,000	14,437,000	41,296,000	47,017,000				1,000	34,000	35,000	0	1,000	205,000	206,000
Operating Income	243,269,000	120,396,000	670,825,000	288,619,000				(1,000)	29,939,000	29,938,000	(159,000)	(516,000)	2,750,000	2,075,000
Interest and Other Income	576,000	1,015,000	3,213,000	1,767,000				0	10,000	10,000	0	0	0	0
Other Nonoperating Income (Expense)								0	(54,000)	(54,000)	0	0	0	0
Interest:
Interest Expense, Debt	118,251,000	120,035,000	347,224,000	437,452,000				0	(11,708,000)	(11,708,000)	0	(3,905,000)	(3,422,000)	(7,327,000)
Amortization of Financing Costs	(2,628,000)	(4,335,000)	(8,554,000)	(15,636,000)				0	(266,000)	(266,000)	0	0	(81,000)	(81,000)
Income (loss) before income and other taxes, (loss) from investments in unconsolidated entities, net gain (loss) on sales of land parcels, discontinued operations and net gain on sales of real estate properties	117,995,000	(7,327,000)	311,099,000	(190,420,000)				(1,000)	17,921,000	17,920,000	(159,000)	(4,421,000)	(753,000)	(5,333,000)
Income and other tax (expense) benefit	(260,000)	(492,000)	(1,146,000)	(1,325,000)				0	(45,000)	(45,000)	0	(7,000)	0	(7,000)
(Loss) from investments in unconsolidated entities	(1,176,000)	(3,209,000)	(10,201,000)	(57,749,000)				0	(1,273,000)	(1,273,000)	0	0	0	0
Net income	$ 231,190,000	$ 391,717,000	$ 431,642,000	$ 1,789,483,000				$ (1,000)	$ 16,603,000	$ 16,602,000	$ (159,000)	$ (4,428,000)	$ (753,000)	$ (5,340,000)