Property Acquisitions - Additional Information (Detail)	1 Months Ended			9 Months Ended
	Apr. 30, 2022 USD ($) Option Property	Sep. 30, 2021 USD ($) Option Property	May 31, 2021 USD ($) Option Property	Sep. 30, 2022 USD ($) Property Option	Sep. 30, 2021 USD ($) Property
Business Acquisition [Line Items]
Number of real estate properties, fee simple | Property		77			77
Aggregate purchase price of properties acquired during the period				$ 63,288,000	$ 126,645,000
Properties Acquired on May 2021 [Member]
Business Acquisition [Line Items]
Aggregate purchase price of properties acquired during the period			$ 31,018,000
Unitary lease description				The leases require our tenant to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase every five years during the initial and renewal terms of the lease.
Purchase price allocated to land			4,551,000
Purchase price allocated to buildings and improvements			22,539,000
Purchase price allocated to in-place leases			3,120,000
Purchase price allocated to above market leases			2,224,000
Purchase price allocated to below market leases			$ 1,416,000
Number of oil change centers acquired during the period | Property			46
Initial term of lease			11 years 6 months
Number of lease renewal options | Option			3
Lease, renewal term			5 years
Properties Acquired On September 2021 [Member]
Business Acquisition [Line Items]
Aggregate purchase price of properties acquired during the period		$ 35,125,000
Unitary lease description				The unitary lease requires our tenant to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually beginning in year three of the initial term and each year of the renewal terms of the lease.
Unitary lease initial term		15 years
Number of unitary lease renewal options | Option		4
Unitary lease renewal term		5 years
Purchase price allocated to land		$ 20,542,000			20,542,000
Purchase price allocated to buildings and improvements		12,785,000			12,785,000
Purchase price allocated to in-place leases		2,893,000			$ 2,893,000
Purchase price allocated to below market leases		$ 1,095,000
Number of convenience stores properties acquired during the period | Property		15			15
Properties Acquired On March April May July And September 2021 [Member]
Business Acquisition [Line Items]
Aggregate purchase price of properties acquired during the period				$ 31,427,000
Number of car wash properties acquired during the period | Property				9
Unitary lease description				The unitary lease requires our tenant to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease.
Unitary lease initial term				15 years
Number of unitary lease renewal options | Option				5
Unitary lease renewal term				5 years
Purchase price allocated to land				$ 5,704,000
Purchase price allocated to buildings and improvements				23,094,000
Purchase price allocated to in-place leases				$ 2,629,000
Properties Acquired On September 2022 [Member]
Business Acquisition [Line Items]
Number of real estate properties, fee simple | Property				16
Aggregate purchase price of properties acquired during the period				$ 63,288,000
Properties Acquired on April 2022 [Member]
Business Acquisition [Line Items]
Aggregate purchase price of properties acquired during the period	$ 36,387,000
Number of car wash properties acquired during the period | Property	8
Unitary lease description				The unitary lease requires our tenant to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease.
Unitary lease initial term	15 years
Number of unitary lease renewal options | Option	5
Unitary lease renewal term	5 years
Purchase price allocated to land	$ 6,219,000
Purchase price allocated to buildings and improvements	27,803,000
Purchase price allocated to in-place leases	2,980,000
Purchase price allocated to above market leases	403,000
Purchase price allocated to below market leases	$ 1,018,000
Properties Acquired In Separate Transactions [Member]
Business Acquisition [Line Items]
Aggregate purchase price of properties acquired during the period				$ 26,901,000	$ 29,074,000
Number of car wash properties acquired during the period | Property				5
Purchase price allocated to land		$ 7,862,000		$ 8,982,000	7,862,000
Purchase price allocated to buildings and improvements		18,379,000		15,737,000	18,379,000
Purchase price allocated to in-place leases		2,227,000		$ 2,182,000	2,227,000
Purchase price allocated to above market leases		$ 606,000			$ 606,000
Number of convenience stores properties acquired during the period | Property				3
Number of convenience store, gasoline station and other automotive related properties acquired during the period | Property					5
Number of convenience store and gasoline station property acquired | Property					1
Number of tire service center acquired | Property					1