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Property Acquisitions - Additional Information (Detail) | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2021 USD ($) Center Option | Feb. 29, 2020 USD ($) Property Option | Jun. 30, 2021 USD ($) Property Option | Jun. 30, 2020 USD ($) Property
Business Acquisition [Line Items] |  |  |  |
Number of real estate properties, fee simple | Property |  |  | 55 |
Aggregate purchase price of properties acquired during the period |  |  | $ 63,304,000 | $ 68,671,000
Number of car wash properties acquired during the period | Property |  |  |  | 15
Properties Acquired in Separate Transactions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price of properties acquired during the period |  |  | 7,905,000 | $ 18,368,000
Purchase price allocated to land |  |  | 1,865,000 | 7,886,000
Purchase price allocated to buildings and improvements |  |  | 5,396,000 | 9,508,000
Purchase price allocated to in-place leases |  |  | $ 644,000 | $ 974,000
Number of car wash properties acquired during the period | Property |  |  | 2 |
Number of convenience store, gasoline station and other automotive related properties acquired during the period | Property |  |  |  | 5
Properties Acquired on May 2021 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price of properties acquired during the period | $ 31,018,000 |  |  |
Number of oil change centers acquired during the period | Center | 46 |  |  |
Initial term of lease | 11 years 6 months |  |  |
Number of lease renewal options | Option | 3 |  |  |
Lease, renewal term | 5 years |  |  |
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. |
Intervals of rent increase | 5 years |  |  |
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 |  |  |
Properties Acquired on March, April, May 2021 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price of properties acquired during the period |  |  | $ 24,381,000 |
Purchase price allocated to land |  |  | 4,081,000 |
Purchase price allocated to buildings and improvements |  |  | 18,262,000 |
Purchase price allocated to in-place leases |  |  | $ 2,038,000 |
Number of car wash properties acquired during the period | Property |  |  | 7 |
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 |
Properties Acquired on February 2020 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price of properties acquired during the period |  | $ 50,303,000 |  |
Purchase price allocated to land |  | 4,775,000 |  |
Purchase price allocated to buildings and improvements |  | 41,093,000 |  |
Purchase price allocated to in-place leases |  | 3,727,000 |  |
Purchase price allocated to above market leases |  | 1,955,000,000 |  |
Purchase price allocated to below market leases |  | $ 1,247,000,000 |  |
Number of car wash properties acquired during the period | Property |  | 10 |  |
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 |  |

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- Definition Amount of acquired leases acquired as part of a real property acquisition at above market lease rate with a finite life. + References No definition available. + Details
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- Definition Description of unitary lease agreements. + References No definition available. + Details
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- Definition Intervals of rent increase. + References No definition available. + Details
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- Definition Amount of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
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- Definition The cash outflow from the acquisition of property as primarily intended to generate income for its owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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