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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
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dividends [Line Items]                              
Preferred Stockholders                         $ 11,193 $ 11,194 $ 12,390
Common Stockholders                         50,963 49,383 48,568
Limited Partnership Unitholders                         $ 17,821 $ 16,751 $ 16,642
Common stock shares issued                         293,615,000 228,498,000 430,462,000
Limited Partnership Units Issued (in shares)                         61,009,000 51,579,000 60,936,000
4th Quarter                              
Dividends [Line Items]                              
Preferred Stockholders $ 2,798       $ 2,798       $ 3,531            
Common Stockholders 13,037       12,371       12,251            
Limited Partnership Unitholders $ 4,702       $ 4,195       $ 4,173            
Common stock shares issued 63,970,000       117,368,000       104,558,000            
Discounted Share Price (in usd per share) $ 45.46       $ 24.08       $ 52.84       $ 45.46 $ 24.08 $ 52.84
Limited Partnership Units Issued (in shares) 13,697,000       23,370,000       13,747,000            
Average Unit Price (in usd per share) $ 45.95       $ 24.35       $ 53.73       $ 45.95 $ 24.35 $ 53.73
3rd Quarter                              
Dividends [Line Items]                              
Preferred Stockholders   $ 2,798       $ 2,798       $ 2,953          
Common Stockholders   12,999       12,373       12,195          
Limited Partnership Unitholders   $ 4,694       $ 4,188       $ 4,166          
Common stock shares issued   65,171,000       14,525,000       105,753,000          
Discounted Share Price (in usd per share)   $ 44.44       $ 28.98       $ 53.66          
Limited Partnership Units Issued (in shares)   13,841,000       13,108,000       13,406,000          
Average Unit Price (in usd per share)   $ 44.92       $ 29.47       $ 54.56          
2nd Quarter                              
Dividends [Line Items]                              
Preferred Stockholders     $ 2,798       $ 2,799       $ 2,953        
Common Stockholders     12,488       12,364       12,116        
Limited Partnership Unitholders     $ 4,218       $ 4,188       $ 4,155        
Common stock shares issued     68,206,000       12,627,000       99,804,000        
Discounted Share Price (in usd per share)     $ 41.87       $ 32.22       $ 51.38        
Limited Partnership Units Issued (in shares)     13,978,000       0       20,041,000        
Average Unit Price (in usd per share)     $ 42.33       $ 0       $ 51.99        
1st Quarter                              
Dividends [Line Items]                              
Preferred Stockholders       $ 2,799       $ 2,799       $ 2,953      
Common Stockholders       12,439       12,275       12,006      
Limited Partnership Unitholders       $ 4,207       $ 4,180       $ 4,148      
Common stock shares issued       96,268,000       83,978,000       120,347,000      
Discounted Share Price (in usd per share)       $ 29.50       $ 48.59       $ 51.28      
Limited Partnership Units Issued (in shares)       19,493,000       15,101,000       13,742,000      
Average Unit Price (in usd per share)       $ 29.83       $ 49.40       $ 52.16