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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
 1 Months Ended 12 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dividends [Line Items]                              
Preferred Stockholders                         $ 12,402 $ 12,375 $ 12,375
Common Stockholders                         46,306 44,576 39,472
Limited Partnership Unitholders                         $ 15,981 $ 15,268 $ 13,533
Common Stock Shares Issued (in shares)                         572,928 266,011 186,797
Limited Partnership Units Issued (in shares)                         107,433 111,351 124,758
October 31                              
Dividends [Line Items]                              
Preferred Stockholders $ 2,953       $ 3,094     $ 3,094              
Common Stockholders 11,706       11,221     10,168              
Limited Partnership Unitholders $ 4,062       $ 3,838     $ 3,478              
Common Stock Shares Issued (in shares) 216,476       82,991     44,176              
Discounted Share Price (in usd per share) $ 49.34       $ 59.33     $ 57.18              
Limited Partnership Units Issued (in shares) 13,867       15,596     30,891              
Average Unit Price (in usd per share) $ 50.20       $ 60.08     $ 57.18              
July 31                              
Dividends [Line Items]                              
Preferred Stockholders   $ 2,953       $ 3,094     $ 3,094            
Common Stockholders   11,590       11,160     10,133            
Limited Partnership Unitholders   $ 4,055       $ 3,830     $ 3,465            
Common Stock Shares Issued (in shares)   201,500       85,731     39,487            
Discounted Share Price (in usd per share)   $ 51.68       $ 57.40     $ 65.64            
Limited Partnership Units Issued (in shares)   13,107       16,021     26,897            
Average Unit Price (in usd per share)   $ 52.60       $ 58.13     $ 65.64            
April 30                              
Dividends [Line Items]                              
Preferred Stockholders     $ 2,672       $ 3,094     $ 3,094          
Common Stockholders     11,545       11,119     10,029          
Limited Partnership Unitholders     $ 3,942       $ 3,810     $ 3,449          
Common Stock Shares Issued (in shares)     85,202       51,003     48,854          
Discounted Share Price (in usd per share)     $ 47.54       $ 59.64     $ 51.59          
Limited Partnership Units Issued (in shares)     42,422       40,623     34,201          
Average Unit Price (in usd per share)     $ 47.83       $ 59.96     $ 51.59          
January 31                              
Dividends [Line Items]                              
Preferred Stockholders       $ 3,824             $ 3,093 $ 3,093      
Common Stockholders       11,465             9,142 11,076      
Limited Partnership Unitholders       $ 3,922             $ 3,141 $ 3,790      
Common Stock Shares Issued (in shares)       69,750             54,280 46,286      
Discounted Share Price (in usd per share)       $ 52.71             $ 49.24 $ 61.85      
Limited Partnership Units Issued (in shares)       38,037             32,769 39,111      
Average Unit Price (in usd per share)       $ 53.03             $ 49.24 $ 62.15