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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 30, 2023
USD ($)
$ / shares
Apr. 27, 2023
USD ($)
$ / shares
Jan. 30, 2023
USD ($)
$ / shares
Jan. 26, 2023
USD ($)
$ / shares
Oct. 30, 2022
USD ($)
$ / shares
Oct. 27, 2022
USD ($)
$ / shares
Jul. 30, 2022
USD ($)
$ / shares
Jul. 28, 2022
USD ($)
$ / shares
Apr. 30, 2022
USD ($)
$ / shares
Apr. 28, 2022
USD ($)
$ / shares
Jan. 30, 2022
USD ($)
$ / shares
Nov. 20, 2019
USD ($)
$ / shares
shares
Mar. 13, 2018
$ / shares
shares
Jun. 28, 2017
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
shares
Mar. 31, 2022
USD ($)
shares
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
shares
Sep. 07, 2021
shares
Dec. 02, 2019
shares
Stockholders Equity [Line Items]                                        
Distribution Expense, Preferred Shareholders                             $ 6,045 $ 6,045        
Accrued Distribution Preferred Shareholders                             $ 2,869 2,869        
Trust shares, authorized (shares) | shares                             500,000,000     500,000,000    
Trust shares, issued (shares) | shares                             71,993,000     72,203,000    
Proceeds from Issuance of Common Stock                             $ (48) 20,161        
Preferred Stock, Shares Authorized | shares                             50,000,000     50,000,000    
Preferred Stock, Shares Issued | shares                             12,600,000     12,600,000    
Stock Issued During Period, Value, New Issues                             $ 48 20,161        
Preferred Stock, Redemption Price Per Share | $ / shares                       $ 25.00                
Trust shares, voting rights                             One vote per share          
Distribution declared per share | $ / shares       $ 0.25   $ 0.25   $ 0.25   $ 0.25                    
Distributions paid       $ 18,051   $ 18,051   $ 17,931   $ 17,510         $ 18,051 17,352        
Net Income Loss Available To Trust Stock Net of Distributions                             $ (892) 4,526        
Document Period End Date                             Mar. 31, 2023          
At the market offering costs                             $ 100          
Commissions Payable to Broker-Dealers and Clearing Organizations                               $ 400        
Stock Repurchase Program, Authorized Amount                                 $ 50,000      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares                             46,000,000          
Stock Repurchased During Period, Shares | shares                             210,000          
Stock Repurchased During Period, Value                             $ 3,954          
At the market equity offering                                        
Stockholders Equity [Line Items]                                        
Trust shares, authorized (shares) | shares                                     500,000,000  
Stock Issued During Period, Shares, New Issues | shares                               712,433        
Proceeds from Issuance or Sale of Equity                               $ 20,200        
Trust Common Shares                                        
Stockholders Equity [Line Items]                                        
Distribution To Shareholders                             18,051 17,352        
Series B                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Shares Authorized | shares                         4,000,000              
Stock Issued During Period, Shares, New Issues | shares                         96,500,000              
Preferred Stock, Redemption Price Per Share | $ / shares                         $ 25.00              
Distribution To Shareholders     $ 1,969   $ 1,969   $ 1,969   $ 1,969   $ 1,969                  
Series B Preferred Stock [Member]                                        
Stockholders Equity [Line Items]                                        
Accrued Distribution Preferred Shareholders                             $ 1,300          
Preferred Stock, Dividend Rate, Percentage                         7.875%              
Preferred Stock, Shares Issued | shares                             4,000,000     4,000,000    
Issuance of Trust preferred shares, net of offering costs                             $ 96,504     $ 96,504    
Preferred Stock, Dividend Rate, Spread                         0.04985              
Series A Preferred Stock                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Dividend Rate, Percentage                           7.25%            
Preferred Stock, Shares Issued | shares                             4,000,000     4,000,000    
Preferred Stock, Liquidation Preference Per Share | $ / shares                           $ 25.00            
Proceeds from Issuance of Preferred Stock and Preference Stock                           $ 100,000            
Issuance of Trust preferred shares, net of offering costs                             $ 96,417     $ 96,417    
Preferred Stock, Cash Distributions Paid, Per Share | $ / shares     $ 453.125000   $ 453.125000   $ 453.125000   $ 453.125000   $ 453.125000                  
Series A                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Shares Authorized | shares                           4,000,000            
Distribution To Shareholders     $ 1,813   $ 1,813   $ 1,813   $ 1,813   $ 1,813                  
Series B [Member]                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Cash Distributions Paid, Per Share | $ / shares     $ 492.1875000   $ 492.1875000   $ 492.1875000   $ 492.1875000   $ 492.1875000                  
Series C Preferred Stock [Member]                                        
Stockholders Equity [Line Items]                                        
Accrued Distribution Preferred Shareholders                             $ 1,500          
Preferred Stock, Dividend Rate, Percentage                       7.875%                
Preferred Stock, Shares Issued | shares                       4,000,000     4,600,000     4,600,000   600,000
Proceeds from Issuance of Preferred Stock and Preference Stock                       $ 115,000                
Stock Issued During Period, Value, New Issues                       $ 111,000                
Issuance of Trust preferred shares, net of offering costs                             $ 110,997     $ 110,997    
Preferred Stock, Cash Distributions Paid, Per Share | $ / shares     $ 492.1875000   $ 492.1875000   $ 492.1875000   $ 492.1875000   $ 492.1875000                  
Distribution To Shareholders     $ 2,264   $ 2,264   $ 2,264   $ 2,264   $ 2,264                  
Subsequent Event                                        
Stockholders Equity [Line Items]                                        
Distribution declared per share | $ / shares   $ 0.25                                    
Distributions paid   $ 17,987                                    
Distributions For Contribution Based Profit Allocation Payments $ 2,100                                      
Subsequent Event | Series B                                        
Stockholders Equity [Line Items]                                        
Distribution To Shareholders $ 1,969                                      
Subsequent Event | Series A Preferred Stock                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Cash Distributions Paid, Per Share | $ / shares $ 453.125000                                      
Subsequent Event | Series A                                        
Stockholders Equity [Line Items]                                        
Distribution To Shareholders $ 1,813                                      
Subsequent Event | Series B [Member]                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Cash Distributions Paid, Per Share | $ / shares $ 492.1875000                                      
Subsequent Event | Series C Preferred Stock [Member]                                        
Stockholders Equity [Line Items]                                        
Preferred Stock, Cash Distributions Paid, Per Share | $ / shares $ 492.1875000                                      
Distribution To Shareholders $ 2,264                                      
Accumulated Deficit | Trust Common Shares                                        
Stockholders Equity [Line Items]                                        
Distribution To Shareholders                             18,051 17,352        
Trust Common Shares                                        
Stockholders Equity [Line Items]                                        
Stock Issued During Period, Value, New Issues                             $ 48 $ 20,161        
Stock Issued During Period, Shares, New Issues | shares                           96,400,000            
Aci [Member] | Subsequent Event                                        
Stockholders Equity [Line Items]                                        
Distributions For Contribution Based Profit Allocation Payments $ 24,400