Description of Leasing Arrangements - Additional Information (Detail)			3 Months Ended
	Aug. 29, 2020 USD ($)	Jul. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) Billboard_Face LandLease Parcel Location	Mar. 31, 2020 USD ($) Parcel
Operating Leased Assets [Line Items]
Number of long-term land leases | LandLease			9
Number of parcels upon which improvements have been completed | Parcel			8	8
Estimated real property taxes attributable to the company land			$ 263,000	$ 341,000
Number of long-term land leases with contingent rent receivable | LandLease			2
Contingent revenue from leasing of parcel of land			$ 21,000	25,000
Excess of straight-line rentals over contractual payments			$ 83,793,000
Triple Net Lease [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Term of leases			99 years
Parcel (6C) [Member]
Operating Leased Assets [Line Items]
Annual rent	$ 220,000
Real estate taxes paid by the tenant	$ 311,000
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			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
Contingent revenue from leasing of parcel of land			$ 0
Notice period of lease			30 days
Decrease in revenue				$ 34,000
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			$ 472,000