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Property Acquisitions - Additional Information (Detail) |  |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2020 USD ($) Property Option | Feb. 04, 2020 USD ($) Property Option | Nov. 22, 2019 USD ($) Property Option | Jun. 17, 2019 USD ($) Property Option | Jun. 30, 2020 USD ($) Property | Jun. 30, 2019 USD ($) Property | Dec. 31, 2019 USD ($) Property
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of gasoline stations and convenience stores acquired during the period | Property | 10 | 10 |  | 6 | 15 | 9 | 27
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period | $ 50,303,000 | $ 50,303,000 |  | $ 24,724,000 | $ 68,671,000 | $ 29,700,000 | $ 87,157,000
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 during the initial and renewal terms of the lease. |  |
Unitary lease initial term | 15 years | 15 years |  | 15 years |  |  |
Number of unitary lease renewal options | Option | 5 | 5 |  | 2 |  |  |
Unitary lease renewal term | 5 years | 5 years |  | 10 years |  |  |
Purchase price allocation, land acquired | $ 4,775,000 | $ 4,775,000 |  | $ 18,086,000 |  |  |
Purchase price allocation, buildings and improvements acquired | 41,093,000 | 41,093,000 |  | 4,789,000 |  |  |
Purchase price allocated to in-place leases | 3,727,000 | 3,727,000 |  | $ 1,849,000 |  |  |
Purchase price allocated to above market leases | 1,955,000 | 1,955,000 |  |  |  |  |
Purchase price allocated to below market leases | $ 1,247,000 | $ 1,247,000 |  |  |  |  |
Convenience Store, Gasoline Station And Other Automotive Related Properties [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  |  |  |  | $ 18,368,000 | $ 4,976,000 |
Number of convenience store, gasoline station and other automotive related acquired during the period | Property |  |  |  |  | 5 | 3 |
Other Acquisition [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price allocation, land acquired |  |  |  |  | $ 7,886,000 | $ 3,075,000 | 18,820,000
Purchase price allocation, buildings and improvements acquired |  |  |  |  | 9,508,000 | 1,813,000 | 26,790,000
Purchase price allocated to in-place leases |  |  |  |  | $ 974,000 | $ 88,000 | 2,744,000
Purchase price allocated to above market leases |  |  |  |  |  |  | 277,000
Purchase price allocated to below market leases |  |  |  |  |  |  | $ 341,000
Gasoline Stations and Convenience Store Properties [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of gasoline stations and convenience stores acquired during the period | Property |  |  |  |  |  |  | 17
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  |  |  |  |  |  | $ 48,290,000
Unitary lease description |  |  |  |  | The unitary lease provides for an initial term of 15 years, with two ten-year renewal options. 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. |  |
QNC OpCo Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of gasoline stations and convenience stores acquired during the period | Property |  |  | 4 |  |  |  |
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  |  | $ 14,144,000 |  |  |  |
Unitary lease description |  |  |  |  | The unitary lease requires QNC 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 allocation, land acquired |  |  | $ 2,663,000 |  |  |  |
Purchase price allocation, buildings and improvements acquired |  |  | 10,469,000 |  |  |  |
Purchase price allocated to in-place leases |  |  | $ 1,012,000 |  |  |  |

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- Definition Number of convenience stores, gasoline stations and other automotive related acquired. + References No definition available. + Details
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- Definition The number of gasoline stations and convenience stores acquired during the period. + References No definition available. + Details
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- Definition Number of renewal options under unitary lease agreements. + 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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