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Operating Partnership Earnings Per Share - Schedule of Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income (loss) $ 18,934 $ 22,322 $ 21,170 $ 21,865 $ 3,920 $ 8,828 $ 9,834 $ 3,013 $ 84,291 $ 25,595 $ (6,991)
Noncontrolling interests-consolidated real estate entities                 (135) (67) (20)
Dividends to preferred shareholders (922) (922) (922) (922) (922) (922) (922) (1,689) (3,688) (4,455) (7,503)
Preferred unit redemption costs               (1,757)   (1,757) (44)
Net income (loss) available to common unitholders                 80,065 19,195 (14,442)
Weighted average units outstanding-basic                 53,821 50,420 48,483
Dilutive units from stock options                 310 388  
Weighted average units outstanding-diluted                 54,131 50,808 48,483
Basic $ 0.33 $ 0.39 $ 0.37 $ 0.39 $ 0.06 $ 0.15 $ 0.18 $ (0.01) $ 1.49 $ 0.38 $ (0.30)
Diluted $ 0.33 $ 0.39 $ 0.37 $ 0.39 $ 0.06 $ 0.15 $ 0.17 $ (0.01) $ 1.48 $ 0.38 $ (0.30)
Post Apartment Homes, L.P. [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income (loss) 18,934 22,322 21,170 21,865 3,920 8,828 9,834 3,013 84,291 25,595 (6,991)
Noncontrolling interests-consolidated real estate entities (39) (55) (35) (6) (11) (9) (58) 11 (135) (67) (20)
Dividends to preferred shareholders (922) (922) (922) (922) (922) (922) (922) (1,689) (3,688) (4,455) (7,503)
Preferred unit redemption costs               (1,757)   (1,757) (44)
Unvested restricted stock (allocation of earnings)                 (186) (59) 65
Net income (loss) available to common unitholders                 $ 80,282 $ 19,257 $ (14,493)
Weighted average units outstanding-basic                 53,968 50,584 48,655
Dilutive units from stock options                 310 388  
Weighted average units outstanding-diluted                 54,278 50,972 48,655
Basic $ 0.33 $ 0.39 $ 0.37 $ 0.39 $ 0.06 $ 0.15 $ 0.18 $ (0.01) $ 1.49 $ 0.38 $ (0.30)
Diluted $ 0.33 $ 0.39 $ 0.37 $ 0.39 $ 0.06 $ 0.15 $ 0.17 $ (0.01) $ 1.48 $ 0.38 $ (0.30)