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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Significant Accounting Policies [Line Items]        
Depreciation and amortization of deferred leasing costs $ 45,487,000 $ 45,865,000 $ 40,490,000  
Repairs and maintenance expense 13,500,000 11,100,000 12,500,000  
Impairment of real estate 0      
Rental revenue, charge offs 800,000      
Deferred leasing costs, net 24,005,000 26,872,000    
Accumulated amortization deferred leasing cost (48,700,000) (44,500,000)    
Amortization of other deferred charges 4,700,000 5,200,000 5,800,000  
Accrued penalties and interest 0 0 $ 0  
Tax basis of the company's real estate investments 1,640,000,000 $ 1,550,000,000    
Right-of-use asset 100,000      
Operating lease liability $ 100,000      
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities      
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets      
Minimum        
Significant Accounting Policies [Line Items]        
Operating lease term of contract       1 year
Minimum | Building        
Significant Accounting Policies [Line Items]        
Estimated useful life 35 years      
Maximum        
Significant Accounting Policies [Line Items]        
Operating lease term of contract       15 years
Maximum | Building        
Significant Accounting Policies [Line Items]        
Estimated useful life 50 years      
Maximum | Building Improvements        
Significant Accounting Policies [Line Items]        
Estimated useful life 20 years