Description of Leasing Arrangements - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Jul. 31, 2020 USD ($)	Mar. 31, 2022 USD ($) Billboard_Face LandLease Location	Mar. 31, 2021 USD ($) LandLease	Sep. 30, 2021 USD ($)
Operating Leased Assets [Line Items]
Number of long-term land leases | LandLease		8	8
Leasing revenue		$ 1,163,000	$ 1,048,000
Estimated real property taxes attributable to the company land		$ 292,000	263,000
Number of long-term land leases with contingent rent receivable | LandLease		2
Contingent revenue from leasing of parcel of land		$ 21,000	21,000
Excess of straight-line rentals over contractual payments		$ 86,911,000
Triple Net Lease [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Term of leases		99 years
Termination of Parcel 20 Lease [Member]
Operating Leased Assets [Line Items]
Leasing revenue				$ 283,000
Real property taxes and operating expense associated with its operation				$ 134,000
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	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		$ 857,000
Cash collections under rent		$ 2,000	$ 45,000