Schedule III - REAL ESTATE AND ACCUMLATED DEPRECIATION (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	$ 688,312
Initial Cost
Land	2,281,112
Buildings and Improvements	677,969
Costs Capitalized Subsequent to Acquisition
Land	(465,397)
Buildings and Improvements	252,913
Gross Amounts at Which Carried at Close of Period
Land	1,815,715
Buildings and Improvements	930,882
Total	2,746,597
Accumulated Depreciation	112,491
Summerlin
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	45,425
Initial Cost
Land	990,179
Costs Capitalized Subsequent to Acquisition
Land	(92,788)
Buildings and Improvements	794
Gross Amounts at Which Carried at Close of Period
Land	897,391
Buildings and Improvements	794
Total	898,185
Accumulated Depreciation	253
Bridgeland
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	18,066
Initial Cost
Land	257,222
Costs Capitalized Subsequent to Acquisition
Land	134,785
Buildings and Improvements	1,627
Gross Amounts at Which Carried at Close of Period
Land	392,007
Buildings and Improvements	1,627
Total	393,634
Accumulated Depreciation	868
Maryland
Initial Cost
Land	457,552
Costs Capitalized Subsequent to Acquisition
Land	(390,028)
Buildings and Improvements	143
Gross Amounts at Which Carried at Close of Period
Land	67,524
Buildings and Improvements	143
Total	67,667
Accumulated Depreciation	42
The Woodlands
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	176,704
Initial Cost
Land	264,141
Costs Capitalized Subsequent to Acquisition
Land	57,941
Buildings and Improvements	18,074
Gross Amounts at Which Carried at Close of Period
Land	206,200
Buildings and Improvements	18,074
Total	224,274
Accumulated Depreciation	9
Ward Centers
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	229,000
Initial Cost
Land	164,007
Buildings and Improvements	89,321
Costs Capitalized Subsequent to Acquisition
Land	(9,491)
Buildings and Improvements	155,662
Gross Amounts at Which Carried at Close of Period
Land	154,516
Buildings and Improvements	244,983
Total	399,499
Accumulated Depreciation	39,841
South Street Seaport
Initial Cost
Buildings and Improvements	7,884
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	4,029
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	11,913
Total	11,913
Accumulated Depreciation	465
Landmark Mall
Initial Cost
Land	28,396
Buildings and Improvements	67,235
Costs Capitalized Subsequent to Acquisition
Land	(19,408)
Buildings and Improvements	(50,417)
Gross Amounts at Which Carried at Close of Period
Land	8,988
Buildings and Improvements	16,818
Total	25,806
Accumulated Depreciation	863
Park West
Initial Cost
Land	16,526
Buildings and Improvements	77,548
Costs Capitalized Subsequent to Acquisition
Land	1,201
Buildings and Improvements	(2,297)
Gross Amounts at Which Carried at Close of Period
Land	17,727
Buildings and Improvements	75,251
Total	92,978
Accumulated Depreciation	14,299
Rio West
Initial Cost
Buildings and Improvements	19,500
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	8,456
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	27,956
Total	27,956
Accumulated Depreciation	17,347
Riverwalk Marketplace
Initial Cost
Buildings and Improvements	94,513
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	(78,141)
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	16,372
Total	16,372
Accumulated Depreciation	688
Cottonwood Square
Initial Cost
Land	1,558
Buildings and Improvements	4,339
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	636
Gross Amounts at Which Carried at Close of Period
Land	1,558
Buildings and Improvements	4,975
Total	6,533
Accumulated Depreciation	1,224
20/25 Waterway Avenue
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	14,450
Initial Cost
Land	2,346
Buildings and Improvements	8,871
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	1,144
Gross Amounts at Which Carried at Close of Period
Land	2,346
Buildings and Improvements	10,015
Total	12,361
Accumulated Depreciation	543
Waterway Garage Retail
Initial Cost
Land	1,342
Buildings and Improvements	4,255
Costs Capitalized Subsequent to Acquisition
Land	(1)
Buildings and Improvements	698
Gross Amounts at Which Carried at Close of Period
Land	1,341
Buildings and Improvements	4,953
Total	6,294
Accumulated Depreciation	151
1400 Woodloch Forest
Costs Capitalized Subsequent to Acquisition
Land	1,570
Buildings and Improvements	13,023
Gross Amounts at Which Carried at Close of Period
Land	1,570
Buildings and Improvements	13,023
Total	14,593
Accumulated Depreciation	5,887
2201 Lake Woodlands Drive
Initial Cost
Land	3,755
Gross Amounts at Which Carried at Close of Period
Land	3,755
Total	3,755
4 Waterway Square
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	40,140
Initial Cost
Land	1,430
Buildings and Improvements	51,553
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	6,576
Gross Amounts at Which Carried at Close of Period
Land	1,430
Buildings and Improvements	58,129
Total	59,559
Accumulated Depreciation	2,831
9303 New Trails
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	13,706
Initial Cost
Land	1,929
Buildings and Improvements	11,915
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	1,619
Gross Amounts at Which Carried at Close of Period
Land	1,929
Buildings and Improvements	13,534
Total	15,463
Accumulated Depreciation	533
The Club at Carlton Woods
Initial Cost
Land	13,796
Buildings and Improvements	457
Costs Capitalized Subsequent to Acquisition
Land	393
Buildings and Improvements	589
Gross Amounts at Which Carried at Close of Period
Land	14,189
Buildings and Improvements	1,046
Total	15,235
Accumulated Depreciation	65
Woodlands Parking Garages
Initial Cost
Land	5,857
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	138
Gross Amounts at Which Carried at Close of Period
Land	5,857
Buildings and Improvements	138
Total	5,995
Accumulated Depreciation	51
Woodlands Resort and Conference Center
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	36,100
Initial Cost
Land	13,258
Buildings and Improvements	37,983
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	4,010
Gross Amounts at Which Carried at Close of Period
Land	13,258
Buildings and Improvements	41,993
Total	55,251
Accumulated Depreciation	1,249
Millennium Waterway Apartments
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	55,584
Initial Cost
Land	15,917
Buildings and Improvements	56,002
Gross Amounts at Which Carried at Close of Period
Land	15,917
Buildings and Improvements	56,002
Total	71,919
Accumulated Depreciation	1,338
110 N. Wacker
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	29,000
Initial Cost
Buildings and Improvements	29,035
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	5,315
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	34,350
Total	34,350
Accumulated Depreciation	11,616
Columbia Offices
Initial Cost
Land	1,575
Buildings and Improvements	28,447
Costs Capitalized Subsequent to Acquisition
Land	1,571
Buildings and Improvements	8,394
Gross Amounts at Which Carried at Close of Period
Land	3,146
Buildings and Improvements	36,841
Total	39,987
Accumulated Depreciation	11,121
Bridges at Mint Hill
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	16,619
Total	16,619
70 Columbia Corporate Center
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	16,037
Initial Cost
Land	1,281
Buildings and Improvements	14,523
Gross Amounts at Which Carried at Close of Period
Land	1,281
Buildings and Improvements	14,523
Total	15,804
Accumulated Depreciation	139
Elk Grove Promenade
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	5,666
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	5,666
Total	5,666
Accumulated Depreciation	4
3 Waterway Square
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	9,150
Initial Cost
Land	748
Costs Capitalized Subsequent to Acquisition
Land	(748)
Buildings and Improvements	23,581
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	23,581
Total	23,581
One Hughes Landing
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	10
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	5,304
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	5,304
Total	5,304
The Shops at Summerlin Centre
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	4,287
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	44,781
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	44,781
Total	44,781
Ala Moana Condo Project
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	24,377
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	24,377
Total	24,377
AllenTowne
Initial Cost
Land	25,575
Costs Capitalized Subsequent to Acquisition
Land	(25,575)
Buildings and Improvements	25,416
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	25,416
Total	25,416
Cottonwood Mall
Initial Cost
Land	7,613
Buildings and Improvements	42,987
Costs Capitalized Subsequent to Acquisition
Land	(4,713)
Buildings and Improvements	(25,996)
Gross Amounts at Which Carried at Close of Period
Land	2,900
Buildings and Improvements	16,991
Total	19,891
Kendall Town Center
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	17,666
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	17,666
Total	17,666
West Windsor
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	21,835
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	21,835
Total	21,835
Alameda Plaza
Initial Cost
Land	740
Buildings and Improvements	2,060
Costs Capitalized Subsequent to Acquisition
Land	(740)
Buildings and Improvements	(999)
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	1,061
Total	1,061
Accumulated Depreciation	30
Century Plaza
Initial Cost
Land	3,164
Buildings and Improvements	28,514
Costs Capitalized Subsequent to Acquisition
Land	(3,164)
Buildings and Improvements	(23,163)
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	5,351
Total	5,351
Village at Redlands
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	6,600
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	6,600
Total	6,600
Redlands Promenade
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	2,907
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	2,907
Total	2,907
Lakemoor (Volo) Land
Initial Cost
Land	320
Costs Capitalized Subsequent to Acquisition
Land	(320)
Buildings and Improvements	321
Gross Amounts at Which Carried at Close of Period
Buildings and Improvements	321
Total	321
Corporate general and administrative
REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	653
Initial Cost
Land	885
Buildings and Improvements	1,027
Costs Capitalized Subsequent to Acquisition
Buildings and Improvements	7,926
Gross Amounts at Which Carried at Close of Period
Land	885
Buildings and Improvements	8,953
Total	9,838
Accumulated Depreciation	$ 1,034