Real Estate Investments and Accumulated Depreciation - Schedule of Real Estate Investments and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate And Accumulated Depreciation [Line Items]
Related Encumbrances	$ 189,537
Initial Costs Land	369,696
Initial Costs Building and Improvements	624,981
Costs Capitalized Subsequent To Acquisition	2,232,168
Gross Amount at Which Carried at Close of Period Land	398,987
Gross Amount at Which Carried at Close of Period Building and Improvements	2,827,858
Gross Amount at Which Carried at Close of Period Total	3,226,845	$ 3,065,405	$ 3,163,035	$ 3,011,352
Accumulated Depreciation	1,023,652	$ 937,310	$ 913,018	$ 842,925
Miscellaneous Investments [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	75,974
Initial Costs Building and Improvements	1,304
Costs Capitalized Subsequent To Acquisition	128,280
Gross Amount at Which Carried at Close of Period Land	77,387
Gross Amount at Which Carried at Close of Period Building and Improvements	128,171
Gross Amount at Which Carried at Close of Period Total	205,558
Accumulated Depreciation	27,710
Georgia [Member] | Post Alexander [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	7,392
Costs Capitalized Subsequent To Acquisition	50,165
Gross Amount at Which Carried at Close of Period Land	7,395
Gross Amount at Which Carried at Close of Period Building and Improvements	50,162
Gross Amount at Which Carried at Close of Period Total	57,557
Accumulated Depreciation	$ 15,466
Date of Construction	2006-04
Georgia [Member] | The High Rise at Post Alexander [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 5,489
Costs Capitalized Subsequent To Acquisition	68,470
Gross Amount at Which Carried at Close of Period Land	5,489
Gross Amount at Which Carried at Close of Period Building and Improvements	68,470
Gross Amount at Which Carried at Close of Period Total	73,959
Accumulated Depreciation	$ 1,434
Date of Construction	2013-05
Georgia [Member] | Post Briarcliff [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Related Encumbrances	$ 56,276
Initial Costs Land	13,344
Costs Capitalized Subsequent To Acquisition	53,553
Gross Amount at Which Carried at Close of Period Land	13,344
Gross Amount at Which Carried at Close of Period Building and Improvements	53,553
Gross Amount at Which Carried at Close of Period Total	66,897
Accumulated Depreciation	$ 28,698
Date of Construction	1996-12
Date Acquired	1996-09
Georgia [Member] | Post Brookhaven [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 7,921
Costs Capitalized Subsequent To Acquisition	41,580
Gross Amount at Which Carried at Close of Period Land	7,921
Gross Amount at Which Carried at Close of Period Building and Improvements	41,580
Gross Amount at Which Carried at Close of Period Total	49,501
Accumulated Depreciation	$ 28,437
Date Acquired	1989-03
Georgia [Member] | Post Brookhaven [Member] | Minimum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1989-07
Georgia [Member] | Post Brookhaven [Member] | Maximum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1992-12
Georgia [Member] | Post Chastain [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 6,352
Costs Capitalized Subsequent To Acquisition	64,525
Gross Amount at Which Carried at Close of Period Land	6,779
Gross Amount at Which Carried at Close of Period Building and Improvements	64,098
Gross Amount at Which Carried at Close of Period Total	70,877
Accumulated Depreciation	$ 36,969
Date Acquired	1988-06
Georgia [Member] | Post Chastain [Member] | Minimum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1988-06
Georgia [Member] | Post Chastain [Member] | Maximum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1990-10
Georgia [Member] | Post Crossing [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Related Encumbrances	$ 25,267
Initial Costs Land	3,951
Costs Capitalized Subsequent To Acquisition	24,901
Gross Amount at Which Carried at Close of Period Land	3,951
Gross Amount at Which Carried at Close of Period Building and Improvements	24,901
Gross Amount at Which Carried at Close of Period Total	28,852
Accumulated Depreciation	$ 14,349
Date Acquired	1993-11
Georgia [Member] | Post Crossing [Member] | Minimum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1994-04
Georgia [Member] | Post Crossing [Member] | Maximum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1995-08
Georgia [Member] | Post Gardens [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 5,859
Costs Capitalized Subsequent To Acquisition	39,135
Gross Amount at Which Carried at Close of Period Land	5,931
Gross Amount at Which Carried at Close of Period Building and Improvements	39,063
Gross Amount at Which Carried at Close of Period Total	44,994
Accumulated Depreciation	$ 22,014
Date of Construction	1996-07
Date Acquired	1996-05
Georgia [Member] | Post Glen [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Related Encumbrances	$ 26,251
Initial Costs Land	5,591
Costs Capitalized Subsequent To Acquisition	25,741
Gross Amount at Which Carried at Close of Period Land	5,784
Gross Amount at Which Carried at Close of Period Building and Improvements	25,548
Gross Amount at Which Carried at Close of Period Total	31,332
Accumulated Depreciation	$ 14,414
Date of Construction	1996-07
Date Acquired	1996-05
Georgia [Member] | Post Parkside [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 3,402
Costs Capitalized Subsequent To Acquisition	22,547
Gross Amount at Which Carried at Close of Period Land	3,465
Gross Amount at Which Carried at Close of Period Building and Improvements	22,484
Gross Amount at Which Carried at Close of Period Total	25,949
Accumulated Depreciation	$ 10,746
Date of Construction	1999-02
Date Acquired	1997-12
Georgia [Member] | Post Peachtree Hills [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 4,215
Costs Capitalized Subsequent To Acquisition	28,229
Gross Amount at Which Carried at Close of Period Land	4,857
Gross Amount at Which Carried at Close of Period Building and Improvements	27,587
Gross Amount at Which Carried at Close of Period Total	32,444
Accumulated Depreciation	$ 12,946
Georgia [Member] | Post Peachtree Hills [Member] | Minimum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1992-02
Date Acquired	1992-02
Georgia [Member] | Post Peachtree Hills [Member] | Maximum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1994-09
Date Acquired	1992-09
Georgia [Member] | Post Riverside [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 11,130
Costs Capitalized Subsequent To Acquisition	126,740
Gross Amount at Which Carried at Close of Period Land	12,457
Gross Amount at Which Carried at Close of Period Building and Improvements	125,413
Gross Amount at Which Carried at Close of Period Total	137,870
Accumulated Depreciation	$ 67,375
Date of Construction	1996-07
Date Acquired	1996-01
Georgia [Member] | Post Spring [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,105
Costs Capitalized Subsequent To Acquisition	42,641
Gross Amount at Which Carried at Close of Period Land	2,105
Gross Amount at Which Carried at Close of Period Building and Improvements	42,641
Gross Amount at Which Carried at Close of Period Total	44,746
Accumulated Depreciation	$ 21,033
Date of Construction	1999-09
Date Acquired	1999-09
Georgia [Member] | Post Stratford [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 328
Costs Capitalized Subsequent To Acquisition	29,918
Gross Amount at Which Carried at Close of Period Land	620
Gross Amount at Which Carried at Close of Period Building and Improvements	29,626
Gross Amount at Which Carried at Close of Period Total	30,246
Accumulated Depreciation	$ 14,530
Date of Construction	1999-04
Date Acquired	1999-01
Virginia [Member] | Post Carlyle Square [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 5,920
Costs Capitalized Subsequent To Acquisition	136,995
Gross Amount at Which Carried at Close of Period Land	8,474
Gross Amount at Which Carried at Close of Period Building and Improvements	134,441
Gross Amount at Which Carried at Close of Period Total	142,915
Accumulated Depreciation	$ 24,367
Virginia [Member] | Post Carlyle Square [Member] | Minimum [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	2004-12
Virginia [Member] | Post Carlyle Square [Member] | Maximum [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	2010-08
Virginia [Member] | Post Corners [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Related Encumbrances	$ 38,230
Initial Costs Land	4,404
Costs Capitalized Subsequent To Acquisition	28,390
Gross Amount at Which Carried at Close of Period Land	4,493
Gross Amount at Which Carried at Close of Period Building and Improvements	28,301
Gross Amount at Which Carried at Close of Period Total	32,794
Accumulated Depreciation	$ 15,953
Date of Construction	1994-06
Date Acquired	1994-06
Virginia [Member] | Post Pentagon Row [Membe | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,359
Initial Costs Building and Improvements	7,659
Costs Capitalized Subsequent To Acquisition	92,004
Gross Amount at Which Carried at Close of Period Land	3,470
Gross Amount at Which Carried at Close of Period Building and Improvements	98,552
Gross Amount at Which Carried at Close of Period Total	102,022
Accumulated Depreciation	$ 38,508
Date of Construction	1999-06
Date Acquired	1999-02
Virginia [Member] | Post Tysons Corner [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 20,000
Initial Costs Building and Improvements	65,478
Costs Capitalized Subsequent To Acquisition	13,151
Gross Amount at Which Carried at Close of Period Land	20,000
Gross Amount at Which Carried at Close of Period Building and Improvements	78,629
Gross Amount at Which Carried at Close of Period Total	98,629
Accumulated Depreciation	$ 25,272
Date Acquired	2004-06
Maryland [Member] | Post Fallsgrove [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 14,801
Initial Costs Building and Improvements	69,179
Costs Capitalized Subsequent To Acquisition	7,545
Gross Amount at Which Carried at Close of Period Land	14,801
Gross Amount at Which Carried at Close of Period Building and Improvements	76,724
Gross Amount at Which Carried at Close of Period Total	91,525
Accumulated Depreciation	$ 20,267
Date Acquired	2006-07
Maryland [Member] | Post Park [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 8,555
Costs Capitalized Subsequent To Acquisition	76,178
Gross Amount at Which Carried at Close of Period Land	8,555
Gross Amount at Which Carried at Close of Period Building and Improvements	76,178
Gross Amount at Which Carried at Close of Period Total	84,733
Accumulated Depreciation	$ 20,319
Date of Construction	2007-12
Texas [Member] | Post Abbey [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 575
Initial Costs Building and Improvements	6,276
Costs Capitalized Subsequent To Acquisition	3,220
Gross Amount at Which Carried at Close of Period Land	575
Gross Amount at Which Carried at Close of Period Building and Improvements	9,496
Gross Amount at Which Carried at Close of Period Total	10,071
Accumulated Depreciation	$ 4,163
Date Acquired	1997-10
Texas [Member] | Post Addison Circle [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,885
Initial Costs Building and Improvements	41,482
Costs Capitalized Subsequent To Acquisition	142,490
Gross Amount at Which Carried at Close of Period Land	8,382
Gross Amount at Which Carried at Close of Period Building and Improvements	178,475
Gross Amount at Which Carried at Close of Period Total	186,857
Accumulated Depreciation	$ 90,567
Date of Construction	1997-10
Date Acquired	1997-10
Texas [Member] | Post Barton Creek [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 1,920
Initial Costs Building and Improvements	24,482
Costs Capitalized Subsequent To Acquisition	5,931
Gross Amount at Which Carried at Close of Period Land	1,920
Gross Amount at Which Carried at Close of Period Building and Improvements	30,413
Gross Amount at Which Carried at Close of Period Total	32,333
Accumulated Depreciation	$ 8,309
Date Acquired	2006-03
Texas [Member] | Post Cole's Corner [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 1,886
Initial Costs Building and Improvements	18,006
Costs Capitalized Subsequent To Acquisition	4,920
Gross Amount at Which Carried at Close of Period Land	2,086
Gross Amount at Which Carried at Close of Period Building and Improvements	22,726
Gross Amount at Which Carried at Close of Period Total	24,812
Accumulated Depreciation	$ 12,223
Date Acquired	1997-10
Texas [Member] | Post Eastside [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 5,735
Costs Capitalized Subsequent To Acquisition	55,388
Gross Amount at Which Carried at Close of Period Land	5,735
Gross Amount at Which Carried at Close of Period Building and Improvements	55,388
Gross Amount at Which Carried at Close of Period Total	61,123
Accumulated Depreciation	$ 16,001
Date of Construction	2006-10
Texas [Member] | Post 510 [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 4,420
Costs Capitalized Subsequent To Acquisition	30,061
Gross Amount at Which Carried at Close of Period Land	4,420
Gross Amount at Which Carried at Close of Period Building and Improvements	30,061
Gross Amount at Which Carried at Close of Period Total	34,481
Accumulated Depreciation	$ 2,593
Date of Construction	2012-05
Texas [Member] | Post Heights/Gallery [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 5,455
Initial Costs Building and Improvements	15,559
Costs Capitalized Subsequent To Acquisition	45,758
Gross Amount at Which Carried at Close of Period Land	5,812
Gross Amount at Which Carried at Close of Period Building and Improvements	60,960
Gross Amount at Which Carried at Close of Period Total	66,772
Accumulated Depreciation	$ 28,397
Date of Construction	1997-10
Date Acquired	1997-10
Texas [Member] | Post Katy Trail [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 7,324
Initial Costs Building and Improvements	40,355
Costs Capitalized Subsequent To Acquisition	1,173
Gross Amount at Which Carried at Close of Period Land	7,324
Gross Amount at Which Carried at Close of Period Building and Improvements	41,528
Gross Amount at Which Carried at Close of Period Total	48,852
Accumulated Depreciation	$ 5,011
Date Acquired	2011-12
Texas [Member] | Post Legacy [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 684
Costs Capitalized Subsequent To Acquisition	39,311
Gross Amount at Which Carried at Close of Period Land	811
Gross Amount at Which Carried at Close of Period Building and Improvements	39,184
Gross Amount at Which Carried at Close of Period Total	39,995
Accumulated Depreciation	$ 17,092
Date of Construction	1999-03
Date Acquired	1999-03
Texas [Member] | Post Meridian [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 1,535
Initial Costs Building and Improvements	11,605
Costs Capitalized Subsequent To Acquisition	6,281
Gross Amount at Which Carried at Close of Period Land	1,535
Gross Amount at Which Carried at Close of Period Building and Improvements	17,886
Gross Amount at Which Carried at Close of Period Total	19,421
Accumulated Depreciation	$ 8,074
Date Acquired	1997-10
Texas [Member] | Post Midtown Square [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 6,370
Initial Costs Building and Improvements	1,412
Costs Capitalized Subsequent To Acquisition	79,350
Gross Amount at Which Carried at Close of Period Land	5,399
Gross Amount at Which Carried at Close of Period Building and Improvements	81,733
Gross Amount at Which Carried at Close of Period Total	87,132
Accumulated Depreciation	$ 30,027
Date Acquired	1997-10
Texas [Member] | Post Midtown Square [Member] | Minimum [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1997-10
Texas [Member] | Post Midtown Square [Member] | Maximum [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	2011-05
Texas [Member] | Post Park Mesa [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 1,480
Initial Costs Building and Improvements	17,861
Costs Capitalized Subsequent To Acquisition	3,164
Gross Amount at Which Carried at Close of Period Land	1,480
Gross Amount at Which Carried at Close of Period Building and Improvements	21,025
Gross Amount at Which Carried at Close of Period Total	22,505
Accumulated Depreciation	$ 5,898
Date Acquired	2006-03
Texas [Member] | Post Sierra At Frisco Bridges [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 3,581
Costs Capitalized Subsequent To Acquisition	40,333
Gross Amount at Which Carried at Close of Period Land	3,581
Gross Amount at Which Carried at Close of Period Building and Improvements	40,333
Gross Amount at Which Carried at Close of Period Total	43,914
Accumulated Depreciation	$ 10,755
Date of Construction	2007-10
Texas [Member] | Post South Lamar [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 4,942
Costs Capitalized Subsequent To Acquisition	35,358
Gross Amount at Which Carried at Close of Period Land	4,942
Gross Amount at Which Carried at Close of Period Building and Improvements	35,358
Gross Amount at Which Carried at Close of Period Total	40,300
Accumulated Depreciation	$ 5,574
Date of Construction	2011-02
Texas [Member] | Post Square [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 4,565
Initial Costs Building and Improvements	24,595
Costs Capitalized Subsequent To Acquisition	6,399
Gross Amount at Which Carried at Close of Period Land	4,565
Gross Amount at Which Carried at Close of Period Building and Improvements	30,994
Gross Amount at Which Carried at Close of Period Total	35,559
Accumulated Depreciation	$ 13,793
Date Acquired	1997-10
Texas [Member] | Post Uptown Village [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 3,955
Initial Costs Building and Improvements	22,120
Costs Capitalized Subsequent To Acquisition	22,954
Gross Amount at Which Carried at Close of Period Land	6,195
Gross Amount at Which Carried at Close of Period Building and Improvements	42,834
Gross Amount at Which Carried at Close of Period Total	49,029
Accumulated Depreciation	$ 20,346
Date Acquired	1997-10
Texas [Member] | Post Vineyard [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 1,133
Initial Costs Building and Improvements	8,560
Costs Capitalized Subsequent To Acquisition	1,979
Gross Amount at Which Carried at Close of Period Land	1,133
Gross Amount at Which Carried at Close of Period Building and Improvements	10,539
Gross Amount at Which Carried at Close of Period Total	11,672
Accumulated Depreciation	$ 4,806
Date Acquired	1997-10
Texas [Member] | Post Vintage [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,614
Initial Costs Building and Improvements	12,188
Costs Capitalized Subsequent To Acquisition	2,769
Gross Amount at Which Carried at Close of Period Land	2,614
Gross Amount at Which Carried at Close of Period Building and Improvements	14,957
Gross Amount at Which Carried at Close of Period Total	17,571
Accumulated Depreciation	$ 7,544
Date Acquired	1997-10
Texas [Member] | Post West Austin [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 10,865
Costs Capitalized Subsequent To Acquisition	40,750
Gross Amount at Which Carried at Close of Period Land	10,865
Gross Amount at Which Carried at Close of Period Building and Improvements	40,750
Gross Amount at Which Carried at Close of Period Total	51,615
Accumulated Depreciation	$ 12,297
Date of Construction	2008-02
Texas [Member] | Post Worthington [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 3,744
Initial Costs Building and Improvements	34,700
Costs Capitalized Subsequent To Acquisition	20,476
Gross Amount at Which Carried at Close of Period Land	3,744
Gross Amount at Which Carried at Close of Period Building and Improvements	55,176
Gross Amount at Which Carried at Close of Period Total	58,920
Accumulated Depreciation	$ 24,535
Date Acquired	1997-10
Florida [Member] | Post Parkside [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,493
Costs Capitalized Subsequent To Acquisition	40,443
Gross Amount at Which Carried at Close of Period Land	2,493
Gross Amount at Which Carried at Close of Period Building and Improvements	40,443
Gross Amount at Which Carried at Close of Period Total	42,936
Accumulated Depreciation	$ 17,957
Date of Construction	1999-03
Date Acquired	1999-03
Florida [Member] | Post Bay At Rocky Point [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 528
Initial Costs Building and Improvements	5,081
Costs Capitalized Subsequent To Acquisition	22,220
Gross Amount at Which Carried at Close of Period Land	2,400
Gross Amount at Which Carried at Close of Period Building and Improvements	25,429
Gross Amount at Which Carried at Close of Period Total	27,829
Accumulated Depreciation	$ 6,623
Date Acquired	2006-10
Florida [Member] | Post Harbour Place [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 3,854
Costs Capitalized Subsequent To Acquisition	73,840
Gross Amount at Which Carried at Close of Period Land	8,312
Gross Amount at Which Carried at Close of Period Building and Improvements	69,382
Gross Amount at Which Carried at Close of Period Total	77,694
Accumulated Depreciation	$ 34,840
Date of Construction	1997-03
Date Acquired	1997-01
Florida [Member] | Post Hyde Park [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Related Encumbrances	$ 43,513
Initial Costs Land	3,498
Costs Capitalized Subsequent To Acquisition	49,160
Gross Amount at Which Carried at Close of Period Land	9,680
Gross Amount at Which Carried at Close of Period Building and Improvements	42,978
Gross Amount at Which Carried at Close of Period Total	52,658
Accumulated Depreciation	$ 19,872
Date Acquired	1994-07
Florida [Member] | Post Hyde Park [Member] | Minimum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1994-09
Florida [Member] | Post Hyde Park [Member] | Maximum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	2006-10
Florida [Member] | Post Lake At Baldwin Park [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 27,341
Initial Costs Building and Improvements	56,702
Costs Capitalized Subsequent To Acquisition	48,666
Gross Amount at Which Carried at Close of Period Land	27,341
Gross Amount at Which Carried at Close of Period Building and Improvements	105,368
Gross Amount at Which Carried at Close of Period Total	132,709
Accumulated Depreciation	$ 19,539
Date of Construction	2011-06
Date Acquired	2007-07
Florida [Member] | Post Lakeside [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 4,377
Initial Costs Building and Improvements	43,724
Costs Capitalized Subsequent To Acquisition	264
Gross Amount at Which Carried at Close of Period Land	4,377
Gross Amount at Which Carried at Close of Period Building and Improvements	43,988
Gross Amount at Which Carried at Close of Period Total	48,365
Accumulated Depreciation	$ 3,541
Date Acquired	2013-05
Florida [Member] | Post Rocky Point [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 10,510
Costs Capitalized Subsequent To Acquisition	79,984
Gross Amount at Which Carried at Close of Period Land	10,567
Gross Amount at Which Carried at Close of Period Building and Improvements	79,927
Gross Amount at Which Carried at Close of Period Total	90,494
Accumulated Depreciation	$ 40,920
Florida [Member] | Post Rocky Point [Member] | Minimum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1994-04
Date Acquired	1994-02
Florida [Member] | Post Rocky Point [Member] | Maximum [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date of Construction	1996-11
Date Acquired	1996-09
Florida [Member] | Post Soho Square [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 5,168
Costs Capitalized Subsequent To Acquisition	33,630
Gross Amount at Which Carried at Close of Period Land	5,168
Gross Amount at Which Carried at Close of Period Building and Improvements	33,630
Gross Amount at Which Carried at Close of Period Total	38,798
Accumulated Depreciation	$ 1,949
Date of Construction	2012-10
North Carolina [Member] | Post Parkside [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 3,970
Costs Capitalized Subsequent To Acquisition	49,026
Gross Amount at Which Carried at Close of Period Land	3,970
Gross Amount at Which Carried at Close of Period Building and Improvements	49,026
Gross Amount at Which Carried at Close of Period Total	52,996
Accumulated Depreciation	$ 5,521
Date of Construction	2011-06
North Carolina [Member] | Post Ballantyne [Member] | Apartment Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 6,400
Initial Costs Building and Improvements	30,850
Costs Capitalized Subsequent To Acquisition	4,192
Gross Amount at Which Carried at Close of Period Land	6,400
Gross Amount at Which Carried at Close of Period Building and Improvements	35,042
Gross Amount at Which Carried at Close of Period Total	41,442
Accumulated Depreciation	$ 11,800
Date of Construction	2004-11
Date Acquired	2005-05
North Carolina [Member] | Post Gateway Place [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,424
Costs Capitalized Subsequent To Acquisition	65,105
Gross Amount at Which Carried at Close of Period Land	3,481
Gross Amount at Which Carried at Close of Period Building and Improvements	64,048
Gross Amount at Which Carried at Close of Period Total	67,529
Accumulated Depreciation	$ 27,889
Date of Construction	2000-11
Date Acquired	1999-08
North Carolina [Member] | Post Park At Phillips Place [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 4,305
Costs Capitalized Subsequent To Acquisition	43,063
Gross Amount at Which Carried at Close of Period Land	4,307
Gross Amount at Which Carried at Close of Period Building and Improvements	43,061
Gross Amount at Which Carried at Close of Period Total	47,368
Accumulated Depreciation	$ 23,611
Date of Construction	1996-01
Date Acquired	1995-11
North Carolina [Member] | Post South End [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 7,732
Initial Costs Building and Improvements	65,803
Costs Capitalized Subsequent To Acquisition	1,613
Gross Amount at Which Carried at Close of Period Land	7,732
Gross Amount at Which Carried at Close of Period Building and Improvements	67,416
Gross Amount at Which Carried at Close of Period Total	75,148
Accumulated Depreciation	$ 7,025
Date Acquired	2012-07
North Carolina [Member] | Post Uptown Place [Member] | Mixed Use Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Initial Costs Land	$ 2,336
Costs Capitalized Subsequent To Acquisition	32,209
Gross Amount at Which Carried at Close of Period Land	2,363
Gross Amount at Which Carried at Close of Period Building and Improvements	32,182
Gross Amount at Which Carried at Close of Period Total	34,545
Accumulated Depreciation	$ 13,753
Date of Construction	1998-09
Date Acquired	1998-09