Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Significant Accounting Policies [Line Items]
Depreciation and amortization of deferred leasing costs	$ 46,386,000	$ 44,163,000	$ 44,636,000
Repairs & maintenance	18,800,000	15,500,000	15,200,000
Deferred leasing costs, net	25,907,000	23,728,000
Accumulated amortization deferred leasing cost	54,600,000	53,700,000
Amortization of other deferred charges	4,100,000	4,200,000	4,300,000
Accrued penalties and interest	0	0	$ 0
Real estate investments for federal income tax	$ 1,850,000,000	$ 1,590,000,000
Minimum
Significant Accounting Policies [Line Items]
Operating lease term of contract	1 year
Minimum | Building
Significant Accounting Policies [Line Items]
Buildings and improvements depreciable lives in years	35 years
Maximum
Significant Accounting Policies [Line Items]
Operating lease term of contract	15 years
Maximum | Building
Significant Accounting Policies [Line Items]
Buildings and improvements depreciable lives in years	50 years
Maximum | Building Improvements
Significant Accounting Policies [Line Items]
Buildings and improvements depreciable lives in years	20 years