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Stock Based Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Stock Awards [Member]
May 06, 2012
Stock Awards, Granted May 6, 2009 [Member]
Dec. 31, 2011
Stock Awards, Granted May 6, 2009 [Member]
May 06, 2011
Stock Awards, Granted May 6, 2009 [Member]
May 06, 2010
Stock Awards, Granted May 6, 2009 [Member]
May 06, 2009
Stock Awards, Granted May 6, 2009 [Member]
Dec. 31, 2011
Stock Awards, Granted May 11, 2010 [Member]
May 11, 2010
Stock Awards, Granted May 11, 2010 [Member]
May 24, 2013
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2012
Stock Awards 1, Granted May 24, 2010 [Member]
Dec. 31, 2011
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2011
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2010
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2013
Stock Awards 2, Granted May 24, 2010 [Member]
May 24, 2012
Stock Awards 2, Granted May 24, 2010 [Member]
Dec. 31, 2011
Stock Awards 2, Granted May 24, 2010 [Member]
May 24, 2011
Stock Awards 2, Granted May 24, 2010 [Member]
May 24, 2010
Stock Awards 2, Granted May 24, 2010 [Member]
Apr. 05, 2014
Stock Awards, Granted April 5, 2011 [Member]
Apr. 05, 2013
Stock Awards, Granted April 5, 2011 [Member]
Apr. 05, 2012
Stock Awards, Granted April 5, 2011 [Member]
Dec. 31, 2011
Stock Awards, Granted April 5, 2011 [Member]
Apr. 05, 2011
Stock Awards, Granted April 5, 2011 [Member]
Dec. 31, 2011
Stock Awards 2, Granted April 5, 2011 [Member]
Apr. 05, 2011
Stock Awards 2, Granted April 5, 2011 [Member]
Rollforward of deferred stock award activity                                                  
Unvested Deferred Stock Awards at beginning of year (in shares) 526,030   44,184       135,130 [1]       106,965         34,912           114,780   75,232 [1]  
Deferred Stock Awards Granted During Fiscal Year 2011 (in shares) 230,592                                                
Deferred Stock Awards Vested During Fiscal Year 2011 (in shares) (241,612)                                                
Deferred Stock Awards Forfeited During Fiscal Year 2011 (in shares) (3,807)                                                
Unvested Deferred Stock Awards at end of year (in shares) 511,203   44,184       135,130 [1]       106,965         34,912           114,780   75,232 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                                                  
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at beginning of year $ 20.20         $ 22.20   $ 28.44         $ 18.71         $ 18.71         $ 19.40   $ 18.27
Deferred Stock Awards Granted During Fiscal Year 2011, Weighted-Average Grant Date Fair $ 19.40                                                
Deferred Stock Awards Vested During Fiscal Year 2011, Weighted-Average Grant Date Fair Value $ 20.80                                                
Deferred Stock Awards Forfeited During Fiscal Year 2011, Weighted Average Grant Date Fair Value $ 19.38                                                
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year $ 19.56         $ 22.20   $ 28.44         $ 18.71         $ 18.71         $ 19.40   $ 18.27
Net Shares Granted           135,564 [2]   27,502 [2],[3]         180,340 [2]         46,440 [2]         142,468 [2]   0 [2]
Grant Date Fair Value $ 19.56         $ 22.20   $ 28.44         $ 18.71         $ 18.71         $ 19.40   $ 18.27
Unvested Shares (in shares) 511,203   44,184       135,130 [1]       106,965         34,912           114,780   75,232 [1]  
Of the shares granted, % vested       25.00% 25.00% 25.00%           25.00% 25.00%       33.33%           25.00%    
Of the shares granted, % expected to vest within one year   25.00%               25.00%         33.33%           25.00%        
Of the shares granted, % expected to vest in two years                 25.00%         33.33%           25.00%          
Of the shares granted, % expected to vest in three years                                     25.00%            
[1] Estimated based on Piedmont's cumulative total stockholder return for the respective performance period relative to a predetermined peer group's cumulative total stockholder return for the respective performance period through December 31, 2011. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.
[2] Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2011.
[3] Represents shares granted at the end of the first interim performance period ended December 31, 2010.