Description of Leasing Arrangements - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($)	Sep. 30, 2023 USD ($) Billboard_Face LandLease	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Billboard_Face LandLease Location	Sep. 30, 2022 USD ($)
Operating Leased Assets [Line Items]
Number of long-term land leases | LandLease		8		8
Estimated real property taxes attributable to the company land		$ 236,000	$ 174,000	$ 708,000	$ 522,000
Number of long-term land leases with contingent rent receivable | LandLease		2		2
Contingent revenue from leasing of parcel of land		$ 24,000	21,000	$ 84,000	63,000
Excess of straight-line rentals over contractual payments				$ 91,900,000
Triple Net Lease [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Term of leases		99 years		99 years
Lamar Lease [Member]
Operating Leased Assets [Line Items]
Leasing revenue				$ 189,000	235,000
Number of advertising locations | Location				23
Number of billboard faces along interstate and primary highways leased | Billboard_Face		44		44
Lease expiration year				2049
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%
Metropark Ltd [Member]
Operating Leased Assets [Line Items]
Term of leases		10 years		10 years
Contingent revenue from leasing of parcel of land		$ 0	0	$ 0	0
Notice period of lease				30 days
Threshold parking revenue per month for scheduled rental payments by lessee	$ 70,000
Percentage of revenue in excess of threshold parking revenue	50.00%
Payments receivable		1,115,000		$ 1,115,000
Cash collections under rent		$ 111,000	$ 71,000	$ 324,000	$ 187,000