Description of leasing arrangements and subsequent event - Additional Information (Detail)			3 Months Ended	12 Months Ended
	Jan. 25, 2024 USD ($) ft²	Jan. 09, 2024 USD ($) Installment	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) Billboard_Face Parcel LandLease Location	May 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 31, 2022 USD ($)	Jun. 30, 2020 USD ($)
Operating Leased Assets [Line Items]
Number of long-term land leases | LandLease				8
Number of parcels upon which improvements have been completed | Parcel				8
Leasing revenue				$ 5,525,000		$ 5,075,000
Number of long-term land leases with contingent rent receivable | LandLease				2
Contingent revenue from leasing of parcel of land				$ 118,000		99,000
Annual rent				4,248,000
Payments receivable				753,182,000
Excess of straight-line rentals over contractual payments				$ 92,728,000
Subsequent Event [Member]
Operating Leased Assets [Line Items]
Contingent revenue from leasing of parcel of land	$ 0
Rentable area (in square feet) | ft²	100,000
Triple Net Lease [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Term of leases				99 years
Parcels [Member]
Operating Leased Assets [Line Items]
Increase (Decrease) in annual property tax			$ (165,000)
Property tax expense				$ 579,000		$ 579,000
City [Member]
Operating Leased Assets [Line Items]
Percentage of parcels available for lease						26.50%
Increase (Decrease) in annual property tax						$ 139,000
Parcel 2 [Member]
Operating Leased Assets [Line Items]
Estimated real property taxes attributable to the company land				$ 944,000		$ 944,000
Lamar Lease [Member]
Operating Leased Assets [Line Items]
Number of advertising locations | Location				23
Number of billboard faces along interstate and primary highways leased | Billboard_Face				44
Lease expiration year				2053
Annual increment in base rent of lease, percentage				2.75%
Period for advance receipt of percentage of gross revenue on leases				12 months
Period to recognize specified lease revenue				30 days
Percentage of revenue due in proportion of gross revenues from each standard billboard				30.00%
Percentage of revenue due in proportion of gross revenues from each electronic billboard				20.00%
Percentage rents					$ 188,000		$ 235,000
Metropark Ltd [Member]
Operating Leased Assets [Line Items]
Term of leases				10 years
Notice period of lease						30 days
Threshold parking revenue per month for scheduled rental payments by lessee								$ 70,000
Payments receivable				$ 150,000
Metropark Ltd [Member] | Subsequent Event [Member]
Operating Leased Assets [Line Items]
Cash collections under rent		$ 57,000
Payments receivable		1,127,000
Payment receivable in each quarterly installment		$ 150,000
Number of quarterly installments | Installment		20
Percentage of interest on unpaid balance		4.73%