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Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dividends [Line Items]      
Preferred Stockholders $ 14,561 $ 15,140 $ 15,140
Common Stockholders 29,205 28,135 27,062
Limited Partnership Unitholders 9,956 9,956 8,339
Dividend Reinvestments, Common Stock Issued (in shares) 475,162 595,388 498,248
Dividend Reinvestments, Limited Partnership Units Issued (in shares) 88,309    
October 31
      
Dividends [Line Items]      
Preferred Stockholders 3,206 3,785 3,785
Common Stockholders 7,388 7,120 6,867
Limited Partnership Unitholders 2,489 2,489 2,489
Dividend Reinvestments, Common Stock Issued (in shares) 48,836 141,960 160,589
Dividend Reinvestments, Discounted Share Price (in usd per share) $ 46.27 $ 42.23 $ 34.82
Dividend Reinvestments, Limited Partnership Units Issued (in shares) 88,309    
Dividend Reinvestments, Average Unit Price (in usd per share) $ 46.93    
July 31
      
Dividends [Line Items]      
Preferred Stockholders 3,206 3,785 3,785
Common Stockholders 7,327 7,063 6,772
Limited Partnership Unitholders 2,489 2,489 1,950
Dividend Reinvestments, Common Stock Issued (in shares) 138,019 144,881 125,973
Dividend Reinvestments, Discounted Share Price (in usd per share) $ 45.21 $ 40.43 $ 38.30
April 30
      
Dividends [Line Items]      
Preferred Stockholders 4,364 3,785 3,785
Common Stockholders 7,272 7,005 6,730
Limited Partnership Unitholders 2,489 2,489 1,950
Dividend Reinvestments, Common Stock Issued (in shares) 142,839 145,118 111,592
Dividend Reinvestments, Discounted Share Price (in usd per share) $ 42.85 $ 38.93 $ 42.49
January 31
      
Dividends [Line Items]      
Preferred Stockholders 3,785 3,785 3,785
Common Stockholders 7,218 6,947 6,693
Limited Partnership Unitholders $ 2,489 $ 2,489 $ 1,950
Dividend Reinvestments, Common Stock Issued (in shares) 145,468 163,429 100,094
Dividend Reinvestments, Discounted Share Price (in usd per share) $ 41.67 $ 34.44 $ 45.92