Real Estate Investments and Accumulated Depreciation - Schedule of Real Estate Investments and Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances	$ 402,464
Initial Costs Land	359,313
Initial Costs Building and Improvements	594,650
Costs Capitalized Subsequent To Acquisition	2,057,389
Gross Amount at Which Carried at Close of Period Land	397,100
Gross Amount at Which Carried at Close of Period Building and Improvements	2,614,252
Gross Amount at Which Carried at Close of Period Total	3,011,352
Accumulated Depreciation	842,925
Georgia [Member] | Post Alexander [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	7,392
Costs Capitalized Subsequent To Acquisition	49,718
Gross Amount at Which Carried at Close of Period Land	7,392
Gross Amount at Which Carried at Close of Period Building and Improvements	49,718
Gross Amount at Which Carried at Close of Period Total	57,110
Accumulated Depreciation	11,119
Date of Construction	2006-04
Georgia [Member] | Post Briarcliff [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Related Encumbrances	58,729
Initial Costs Land	13,344
Costs Capitalized Subsequent To Acquisition	50,654
Gross Amount at Which Carried at Close of Period Land	13,344
Gross Amount at Which Carried at Close of Period Building and Improvements	50,654
Gross Amount at Which Carried at Close of Period Total	63,998
Accumulated Depreciation	23,797
Date of Construction	1996-12
Date Acquired	1996-09
Georgia [Member] | Post Brookhaven [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	7,921
Costs Capitalized Subsequent To Acquisition	38,361
Gross Amount at Which Carried at Close of Period Land	7,921
Gross Amount at Which Carried at Close of Period Building and Improvements	38,361
Gross Amount at Which Carried at Close of Period Total	46,282
Accumulated Depreciation	24,823
Date of Construction	1989-07
Date Acquired	1989-03
Georgia [Member] | Post Brookhaven [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	1992-12
Georgia [Member] | Post Chastain [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	6,352
Costs Capitalized Subsequent To Acquisition	62,110
Gross Amount at Which Carried at Close of Period Land	6,779
Gross Amount at Which Carried at Close of Period Building and Improvements	61,683
Gross Amount at Which Carried at Close of Period Total	68,462
Accumulated Depreciation	32,499
Date of Construction	1988-06
Date Acquired	1988-06
Georgia [Member] | Post Chastain [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	1990-10
Georgia [Member] | Post Crossing [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Related Encumbrances	26,368
Initial Costs Land	3,951
Costs Capitalized Subsequent To Acquisition	22,638
Gross Amount at Which Carried at Close of Period Land	3,951
Gross Amount at Which Carried at Close of Period Building and Improvements	22,638
Gross Amount at Which Carried at Close of Period Total	26,589
Accumulated Depreciation	11,831
Date of Construction	1994-04
Date Acquired	1993-11
Georgia [Member] | Post Crossing [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	1995-08
Georgia [Member] | Post Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	5,859
Costs Capitalized Subsequent To Acquisition	36,965
Gross Amount at Which Carried at Close of Period Land	5,931
Gross Amount at Which Carried at Close of Period Building and Improvements	36,893
Gross Amount at Which Carried at Close of Period Total	42,824
Accumulated Depreciation	18,340
Date of Construction	1996-07
Date Acquired	1996-05
Georgia [Member] | Post Glen [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Related Encumbrances	27,395
Initial Costs Land	5,591
Costs Capitalized Subsequent To Acquisition	24,398
Gross Amount at Which Carried at Close of Period Land	5,784
Gross Amount at Which Carried at Close of Period Building and Improvements	24,205
Gross Amount at Which Carried at Close of Period Total	29,989
Accumulated Depreciation	12,025
Date of Construction	1996-07
Date Acquired	1996-05
Georgia [Member] | Post Parkside [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	3,402
Costs Capitalized Subsequent To Acquisition	22,047
Gross Amount at Which Carried at Close of Period Land	3,465
Gross Amount at Which Carried at Close of Period Building and Improvements	21,984
Gross Amount at Which Carried at Close of Period Total	25,449
Accumulated Depreciation	8,996
Date of Construction	1999-02
Date Acquired	1997-12
Georgia [Member] | Post Peachtree Hills [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	4,215
Costs Capitalized Subsequent To Acquisition	26,565
Gross Amount at Which Carried at Close of Period Land	4,857
Gross Amount at Which Carried at Close of Period Building and Improvements	25,923
Gross Amount at Which Carried at Close of Period Total	30,780
Accumulated Depreciation	10,522
Date of Construction	1992-02
Date Acquired	1992-02
Georgia [Member] | Post Peachtree Hills [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	1994-09
Date Acquired	1992-09
Georgia [Member] | Post Renaissance [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Costs Capitalized Subsequent To Acquisition	32,418
Gross Amount at Which Carried at Close of Period Land	7,391
Gross Amount at Which Carried at Close of Period Building and Improvements	25,027
Gross Amount at Which Carried at Close of Period Total	32,418
Accumulated Depreciation	13,650
Date of Construction	1991-07
Date Acquired	1991-06
Georgia [Member] | Post Renaissance [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	1994-12
Date Acquired	1994-01
Georgia [Member] | Post Riverside [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	11,130
Costs Capitalized Subsequent To Acquisition	120,618
Gross Amount at Which Carried at Close of Period Land	12,457
Gross Amount at Which Carried at Close of Period Building and Improvements	119,291
Gross Amount at Which Carried at Close of Period Total	131,748
Accumulated Depreciation	56,140
Date of Construction	1996-07
Date Acquired	1996-01
Georgia [Member] | Post Spring [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	2,105
Costs Capitalized Subsequent To Acquisition	41,501
Gross Amount at Which Carried at Close of Period Land	2,105
Gross Amount at Which Carried at Close of Period Building and Improvements	41,501
Gross Amount at Which Carried at Close of Period Total	43,606
Accumulated Depreciation	17,154
Date of Construction	1999-09
Date Acquired	1999-09
Georgia [Member] | Post Stratford [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	328
Costs Capitalized Subsequent To Acquisition	29,375
Gross Amount at Which Carried at Close of Period Land	620
Gross Amount at Which Carried at Close of Period Building and Improvements	29,083
Gross Amount at Which Carried at Close of Period Total	29,703
Accumulated Depreciation	11,932
Date of Construction	1999-04
Date Acquired	1999-01
Virginia [Member] | Post Carlyle Square [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	5,870
Costs Capitalized Subsequent To Acquisition	135,465
Gross Amount at Which Carried at Close of Period Land	8,424
Gross Amount at Which Carried at Close of Period Building and Improvements	132,911
Gross Amount at Which Carried at Close of Period Total	141,335
Accumulated Depreciation	11,571
Date of Construction	2004-12
Virginia [Member] | Post Carlyle Square [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	2010-08
Virginia [Member] | Post Corners [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Related Encumbrances	39,897
Initial Costs Land	4,404
Costs Capitalized Subsequent To Acquisition	26,943
Gross Amount at Which Carried at Close of Period Land	4,493
Gross Amount at Which Carried at Close of Period Building and Improvements	26,854
Gross Amount at Which Carried at Close of Period Total	31,347
Accumulated Depreciation	13,115
Date of Construction	1994-06
Date Acquired	1994-06
Virginia [Member] | Post Pentagon Row [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	2,359
Initial Costs Building and Improvements	7,659
Costs Capitalized Subsequent To Acquisition	90,121
Gross Amount at Which Carried at Close of Period Land	3,470
Gross Amount at Which Carried at Close of Period Building and Improvements	96,669
Gross Amount at Which Carried at Close of Period Total	100,139
Accumulated Depreciation	30,113
Date of Construction	1999-06
Date Acquired	1999-02
Virginia [Member] | Post Tysons Corner [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	20,000
Initial Costs Building and Improvements	65,478
Costs Capitalized Subsequent To Acquisition	7,308
Gross Amount at Which Carried at Close of Period Land	20,000
Gross Amount at Which Carried at Close of Period Building and Improvements	72,786
Gross Amount at Which Carried at Close of Period Total	92,786
Accumulated Depreciation	18,630
Date Acquired	2004-06
Maryland [Member] | Post Fallsgrove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	14,801
Initial Costs Building and Improvements	69,179
Costs Capitalized Subsequent To Acquisition	5,288
Gross Amount at Which Carried at Close of Period Land	14,801
Gross Amount at Which Carried at Close of Period Building and Improvements	74,467
Gross Amount at Which Carried at Close of Period Total	89,268
Accumulated Depreciation	13,643
Date Acquired	2006-07
Maryland [Member] | Post Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	8,555
Costs Capitalized Subsequent To Acquisition	75,311
Gross Amount at Which Carried at Close of Period Land	8,555
Gross Amount at Which Carried at Close of Period Building and Improvements	75,311
Gross Amount at Which Carried at Close of Period Total	83,866
Accumulated Depreciation	11,125
Date of Construction	2007-12
Texas [Member] | Post Abbey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	575
Initial Costs Building and Improvements	6,276
Costs Capitalized Subsequent To Acquisition	2,736
Gross Amount at Which Carried at Close of Period Land	575
Gross Amount at Which Carried at Close of Period Building and Improvements	9,012
Gross Amount at Which Carried at Close of Period Total	9,587
Accumulated Depreciation	3,377
Date Acquired	1997-10
Texas [Member] | Post Addison Circle [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Related Encumbrances	120,000
Initial Costs Land	2,885
Initial Costs Building and Improvements	41,482
Costs Capitalized Subsequent To Acquisition	136,450
Gross Amount at Which Carried at Close of Period Land	8,382
Gross Amount at Which Carried at Close of Period Building and Improvements	172,435
Gross Amount at Which Carried at Close of Period Total	180,817
Accumulated Depreciation	74,260
Date of Construction	1997-10
Date Acquired	1997-10
Texas [Member] | Post Barton Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	1,920
Initial Costs Building and Improvements	24,482
Costs Capitalized Subsequent To Acquisition	3,798
Gross Amount at Which Carried at Close of Period Land	1,920
Gross Amount at Which Carried at Close of Period Building and Improvements	28,280
Gross Amount at Which Carried at Close of Period Total	30,200
Accumulated Depreciation	5,579
Date Acquired	2006-03
Texas [Member] | Post Cole's Corner [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	1,886
Initial Costs Building and Improvements	18,006
Costs Capitalized Subsequent To Acquisition	4,541
Gross Amount at Which Carried at Close of Period Land	2,086
Gross Amount at Which Carried at Close of Period Building and Improvements	22,347
Gross Amount at Which Carried at Close of Period Total	24,433
Accumulated Depreciation	10,212
Date Acquired	1997-10
Texas [Member] | Post Eastside [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	5,735
Costs Capitalized Subsequent To Acquisition	52,043
Gross Amount at Which Carried at Close of Period Land	5,735
Gross Amount at Which Carried at Close of Period Building and Improvements	52,043
Gross Amount at Which Carried at Close of Period Total	57,778
Accumulated Depreciation	9,954
Date of Construction	2006-10
Texas [Member] | Post Heights/Gallery [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	5,455
Initial Costs Building and Improvements	15,559
Costs Capitalized Subsequent To Acquisition	42,428
Gross Amount at Which Carried at Close of Period Land	5,812
Gross Amount at Which Carried at Close of Period Building and Improvements	57,630
Gross Amount at Which Carried at Close of Period Total	63,442
Accumulated Depreciation	24,469
Date of Construction	1997-10
Date Acquired	1997-10
Texas [Member] | Post Katy Trail [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	7,324
Initial Costs Building and Improvements	40,355
Costs Capitalized Subsequent To Acquisition	240
Gross Amount at Which Carried at Close of Period Land	7,324
Gross Amount at Which Carried at Close of Period Building and Improvements	40,595
Gross Amount at Which Carried at Close of Period Total	47,919
Accumulated Depreciation	1,267
Date Acquired	2011-12
Texas [Member] | Post Legacy [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	684
Costs Capitalized Subsequent To Acquisition	37,209
Gross Amount at Which Carried at Close of Period Land	811
Gross Amount at Which Carried at Close of Period Building and Improvements	37,082
Gross Amount at Which Carried at Close of Period Total	37,893
Accumulated Depreciation	13,844
Date of Construction	1999-03
Date Acquired	1999-03
Texas [Member] | Post Meridian [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	1,535
Initial Costs Building and Improvements	11,605
Costs Capitalized Subsequent To Acquisition	2,898
Gross Amount at Which Carried at Close of Period Land	1,535
Gross Amount at Which Carried at Close of Period Building and Improvements	14,503
Gross Amount at Which Carried at Close of Period Total	16,038
Accumulated Depreciation	6,446
Date Acquired	1997-10
Texas [Member] | Post Midtown Square [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	6,282
Initial Costs Building and Improvements	1,412
Costs Capitalized Subsequent To Acquisition	74,893
Gross Amount at Which Carried at Close of Period Land	5,311
Gross Amount at Which Carried at Close of Period Building and Improvements	77,276
Gross Amount at Which Carried at Close of Period Total	82,587
Accumulated Depreciation	22,103
Date of Construction	1997-10
Date Acquired	1997-10
Texas [Member] | Post Midtown Square [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	2011-05
Texas [Member] | Post Park Mesa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	1,480
Initial Costs Building and Improvements	17,861
Costs Capitalized Subsequent To Acquisition	2,304
Gross Amount at Which Carried at Close of Period Land	1,480
Gross Amount at Which Carried at Close of Period Building and Improvements	20,165
Gross Amount at Which Carried at Close of Period Total	21,645
Accumulated Depreciation	4,078
Date Acquired	2006-03
Texas [Member] | Post Rice Lofts [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	449
Initial Costs Building and Improvements	13,393
Costs Capitalized Subsequent To Acquisition	36,100
Gross Amount at Which Carried at Close of Period Land	449
Gross Amount at Which Carried at Close of Period Building and Improvements	49,493
Gross Amount at Which Carried at Close of Period Total	49,942
Accumulated Depreciation	16,248
Date of Construction	1997-10
Date Acquired	1997-10
Texas [Member] | Post Sierra At Frisco Bridges [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	3,581
Costs Capitalized Subsequent To Acquisition	38,096
Gross Amount at Which Carried at Close of Period Land	3,581
Gross Amount at Which Carried at Close of Period Building and Improvements	38,096
Gross Amount at Which Carried at Close of Period Total	41,677
Accumulated Depreciation	6,020
Date of Construction	2007-10
Texas [Member] | Post South Lamar [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	4,263
Costs Capitalized Subsequent To Acquisition	23,029
Gross Amount at Which Carried at Close of Period Land	4,263
Gross Amount at Which Carried at Close of Period Building and Improvements	23,029
Gross Amount at Which Carried at Close of Period Total	27,292
Accumulated Depreciation	226
Date of Construction	2002-11
Texas [Member] | Post Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	4,565
Initial Costs Building and Improvements	24,595
Costs Capitalized Subsequent To Acquisition	3,702
Gross Amount at Which Carried at Close of Period Land	4,565
Gross Amount at Which Carried at Close of Period Building and Improvements	28,297
Gross Amount at Which Carried at Close of Period Total	32,862
Accumulated Depreciation	11,199
Date Acquired	1997-10
Texas [Member] | Post Uptown Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	3,955
Initial Costs Building and Improvements	22,120
Costs Capitalized Subsequent To Acquisition	21,843
Gross Amount at Which Carried at Close of Period Land	6,195
Gross Amount at Which Carried at Close of Period Building and Improvements	41,723
Gross Amount at Which Carried at Close of Period Total	47,918
Accumulated Depreciation	16,136
Date Acquired	1997-10
Texas [Member] | Post Vineyard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	1,133
Initial Costs Building and Improvements	8,560
Costs Capitalized Subsequent To Acquisition	1,729
Gross Amount at Which Carried at Close of Period Land	1,133
Gross Amount at Which Carried at Close of Period Building and Improvements	10,289
Gross Amount at Which Carried at Close of Period Total	11,422
Accumulated Depreciation	3,884
Date Acquired	1997-10
Texas [Member] | Post Vintage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	2,614
Initial Costs Building and Improvements	12,188
Costs Capitalized Subsequent To Acquisition	2,382
Gross Amount at Which Carried at Close of Period Land	2,614
Gross Amount at Which Carried at Close of Period Building and Improvements	14,570
Gross Amount at Which Carried at Close of Period Total	17,184
Accumulated Depreciation	6,156
Date Acquired	1997-10
Texas [Member] | Post West Austin [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	10,865
Costs Capitalized Subsequent To Acquisition	40,379
Gross Amount at Which Carried at Close of Period Land	10,865
Gross Amount at Which Carried at Close of Period Building and Improvements	40,379
Gross Amount at Which Carried at Close of Period Total	51,244
Accumulated Depreciation	7,213
Date of Construction	2008-02
Texas [Member] | Post Worthington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	3,744
Initial Costs Building and Improvements	34,700
Costs Capitalized Subsequent To Acquisition	19,092
Gross Amount at Which Carried at Close of Period Land	3,744
Gross Amount at Which Carried at Close of Period Building and Improvements	53,792
Gross Amount at Which Carried at Close of Period Total	57,536
Accumulated Depreciation	19,719
Date Acquired	1997-10
Florida [Member] | Post Parkside [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	2,493
Costs Capitalized Subsequent To Acquisition	37,541
Gross Amount at Which Carried at Close of Period Land	2,493
Gross Amount at Which Carried at Close of Period Building and Improvements	37,541
Gross Amount at Which Carried at Close of Period Total	40,034
Accumulated Depreciation	14,217
Date of Construction	1999-03
Date Acquired	1999-03
Florida [Member] | Post Bay At Rocky Point [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	528
Initial Costs Building and Improvements	5,081
Costs Capitalized Subsequent To Acquisition	21,157
Gross Amount at Which Carried at Close of Period Land	2,400
Gross Amount at Which Carried at Close of Period Building and Improvements	24,366
Gross Amount at Which Carried at Close of Period Total	26,766
Accumulated Depreciation	4,519
Date Acquired	2006-10
Florida [Member] | Post Harbour Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	3,854
Costs Capitalized Subsequent To Acquisition	71,310
Gross Amount at Which Carried at Close of Period Land	8,312
Gross Amount at Which Carried at Close of Period Building and Improvements	66,852
Gross Amount at Which Carried at Close of Period Total	75,164
Accumulated Depreciation	28,111
Date of Construction	1997-03
Date Acquired	1997-01
Florida [Member] | Post Hyde Park [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Related Encumbrances	45,408
Initial Costs Land	3,498
Costs Capitalized Subsequent To Acquisition	44,069
Gross Amount at Which Carried at Close of Period Land	9,680
Gross Amount at Which Carried at Close of Period Building and Improvements	37,887
Gross Amount at Which Carried at Close of Period Total	47,567
Accumulated Depreciation	15,824
Date of Construction	1994-09
Date Acquired	1994-07
Florida [Member] | Post Hyde Park [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	2006-10
Florida [Member] | Post Lake At Baldwin Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	17,500
Initial Costs Building and Improvements	56,702
Costs Capitalized Subsequent To Acquisition	2,594
Gross Amount at Which Carried at Close of Period Land	17,500
Gross Amount at Which Carried at Close of Period Building and Improvements	59,296
Gross Amount at Which Carried at Close of Period Total	76,796
Accumulated Depreciation	9,958
Date Acquired	2007-07
Florida [Member] | Post Rocky Point [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	10,510
Costs Capitalized Subsequent To Acquisition	74,158
Gross Amount at Which Carried at Close of Period Land	10,567
Gross Amount at Which Carried at Close of Period Building and Improvements	74,101
Gross Amount at Which Carried at Close of Period Total	84,668
Accumulated Depreciation	32,877
Date of Construction	1994-04
Date Acquired	1994-02
Florida [Member] | Post Rocky Point [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Date of Construction	1996-11
Date Acquired	1996-09
New York [Member] | Post Luminaria [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Related Encumbrances	34,076
Initial Costs Land	4,938
Costs Capitalized Subsequent To Acquisition	42,577
Gross Amount at Which Carried at Close of Period Land	4,938
Gross Amount at Which Carried at Close of Period Building and Improvements	42,577
Gross Amount at Which Carried at Close of Period Total	47,515
Accumulated Depreciation	15,699
Date of Construction	2001-03
Date Acquired	2001-03
New York [Member] | Post Toscana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Related Encumbrances	50,591
Initial Costs Land	15,976
Costs Capitalized Subsequent To Acquisition	78,094
Gross Amount at Which Carried at Close of Period Land	17,156
Gross Amount at Which Carried at Close of Period Building and Improvements	76,914
Gross Amount at Which Carried at Close of Period Total	94,070
Accumulated Depreciation	19,389
Date of Construction	2002-01
Date Acquired	2002-01
North Carolina [Member] | Post Ballantyne [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Apartments
Initial Costs Land	6,400
Initial Costs Building and Improvements	30,850
Costs Capitalized Subsequent To Acquisition	3,566
Gross Amount at Which Carried at Close of Period Land	6,400
Gross Amount at Which Carried at Close of Period Building and Improvements	34,416
Gross Amount at Which Carried at Close of Period Total	40,816
Accumulated Depreciation	8,813
Date of Construction	2004-11
Date Acquired	2005-05
North Carolina [Member] | Post Gateway Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	2,424
Costs Capitalized Subsequent To Acquisition	64,312
Gross Amount at Which Carried at Close of Period Land	3,481
Gross Amount at Which Carried at Close of Period Building and Improvements	63,255
Gross Amount at Which Carried at Close of Period Total	66,736
Accumulated Depreciation	22,598
Date of Construction	2000-11
Date Acquired	1999-08
North Carolina [Member] | Post Park At Phillips Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	4,305
Costs Capitalized Subsequent To Acquisition	41,654
Gross Amount at Which Carried at Close of Period Land	4,307
Gross Amount at Which Carried at Close of Period Building and Improvements	41,652
Gross Amount at Which Carried at Close of Period Total	45,959
Accumulated Depreciation	19,767
Date of Construction	1996-01
Date Acquired	1995-11
North Carolina [Member] | Post South End [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	7,732
Initial Costs Building and Improvements	65,803
Costs Capitalized Subsequent To Acquisition	449
Gross Amount at Which Carried at Close of Period Land	7,732
Gross Amount at Which Carried at Close of Period Building and Improvements	66,252
Gross Amount at Which Carried at Close of Period Total	73,984
Accumulated Depreciation	897
Date Acquired	2012-07
North Carolina [Member] | Post Uptown Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Description	Mixed Use
Initial Costs Land	2,336
Costs Capitalized Subsequent To Acquisition	30,525
Gross Amount at Which Carried at Close of Period Land	2,363
Gross Amount at Which Carried at Close of Period Building and Improvements	30,498
Gross Amount at Which Carried at Close of Period Total	32,861
Accumulated Depreciation	11,261
Date of Construction	1998-09
Date Acquired	1998-09
Miscellaneous Investments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Costs Land	78,310
Initial Costs Building and Improvements	1,304
Costs Capitalized Subsequent To Acquisition	101,687
Gross Amount at Which Carried at Close of Period Land	79,651
Gross Amount at Which Carried at Close of Period Building and Improvements	101,650
Gross Amount at Which Carried at Close of Period Total	181,301
Accumulated Depreciation	$ 25,580