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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 ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dividends [Line Items]                              
Preferred Stockholders                         $ 12,375 $ 12,375 $ 13,474
Common Stockholders                         39,472 35,645 32,346
Limited Partnership Unitholders                         $ 13,533 $ 12,228 $ 11,117
Common Stock Shares Issued                         186,797 201,212 197,638
Limited Partnership Units Issued                         124,758 107,037 196,183
October 31                              
Dividends [Line Items]                              
Preferred Stockholders $ 3,094       $ 3,094       $ 3,856            
Common Stockholders 10,168       9,106       8,348            
Limited Partnership Unitholders $ 3,478       $ 3,129       $ 2,879            
Common Stock Shares Issued 44,176       47,313       40,142            
Discounted Share Price $ 57.18       $ 55.73       $ 52.71            
Limited Partnership Units Issued 30,891       28,936                    
Average Unit Price $ 57.18       $ 55.73                    
July 31                              
Dividends [Line Items]                              
Preferred Stockholders   $ 3,094       $ 3,094       $ 3,206          
Common Stockholders   10,133       9,081       8,314          
Limited Partnership Unitholders   $ 3,465       $ 3,115       $ 2,879          
Common Stock Shares Issued   39,487       56,003       57,696          
Discounted Share Price   $ 65.64       $ 50.30       $ 46.79          
Limited Partnership Units Issued   26,897       32,041                  
Average Unit Price   $ 65.64       $ 50.30                  
April 30                              
Dividends [Line Items]                              
Preferred Stockholders     $ 3,094       $ 3,094       $ 3,206        
Common Stockholders     10,029       9,055       8,269        
Limited Partnership Unitholders     $ 3,449       $ 3,104       $ 2,838        
Common Stock Shares Issued     48,854       54,921       60,212        
Discounted Share Price     $ 51.59       $ 50.21       $ 44.14        
Limited Partnership Units Issued     34,201       25,264       104,831        
Average Unit Price     $ 51.59       $ 50.21       $ 44.77        
January 31                              
Dividends [Line Items]                              
Preferred Stockholders       $ 3,093       $ 3,093       $ 3,206      
Common Stockholders       9,142       8,403       7,415      
Limited Partnership Unitholders       $ 3,141       $ 2,880       $ 2,521      
Common Stock Shares Issued       54,280       42,975       39,588      
Discounted Share Price       $ 49.24       $ 56.74       $ 45.15      
Limited Partnership Units Issued       32,769       20,796       91,352      
Average Unit Price       $ 49.24       $ 56.74       $ 45.80