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Property Acquisitions - Additional Information (Detail) |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 17, 2018 USD ($) Property Option | Oct. 03, 2017 USD ($) Property Option Restaurant | Sep. 06, 2017 USD ($) Property Option | Jun. 30, 2018 USD ($) Property | Jun. 30, 2017 USD ($) Property
Business Acquisition [Line Items] |  |  |  |  |
Number of gasoline stations and convenience stores acquired during the period | Property |  |  |  |  | 10
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  |  |  | $ 55,308,000 | $ 17,800,000
Number of stand-alone Burger King quick service restaurants acquired during the period | Restaurant |  | 5 |  |  |
GPM Investments, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of gasoline stations and convenience stores acquired during the period | Property | 30 |  |  | 2 |
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period | $ 52,592,000 |  |  | $ 2,716,000 |
Unitary lease description |  |  |  | The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires GPM to pay a fixed annual rent plus all amounts pertaining to the GPM 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 | 4 |  |  |  |
Unitary lease renewal term | 5 years |  |  |  |
Purchase price allocation, land acquired | $ 31,633,000 |  |  |  |
Purchase price allocation, buildings and improvements acquired | 17,489,000 |  |  |  |
Purchase price allocated to in-place leases | 4,047,000 |  |  |  |
Purchase price allocated to below market leases | $ 577,000 |  |  |  |
GPM Investments, LLC [Member] | Land [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price allocation, land acquired |  |  |  | $ 1,207,000 |
GPM Investments, LLC [Member] | Building and Building Improvements [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price allocation, buildings and improvements acquired |  |  |  | 1,326,000 |
GPM Investments, LLC [Member] | In-Place Leases [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price allocated to in-place leases |  |  |  | $ 183,000 |
Gasoline Stations and Convenience Store Properties [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  |  |  |  | 17,800,000
Gasoline Stations and Convenience Store Properties [Member] | Land [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price allocation, land acquired |  |  |  |  | 3,825,000
Gasoline Stations and Convenience Store Properties [Member] | Building and Building Improvements [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price allocation, buildings and improvements acquired |  |  |  |  | 12,000,000
Gasoline Stations and Convenience Store Properties [Member] | In-Place Leases [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price allocated to in-place leases |  |  |  |  | $ 1,975,000
Empire Petroleum Partners, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of gasoline stations and convenience stores acquired during the period | Property |  |  | 49 |  |
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  |  | $ 123,126,000 |  |
Unitary lease description |  |  |  | The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires Empire to pay a fixed annual rent plus all amounts pertaining to the Empire 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 |  |  | 4 |  |
Unitary lease renewal term |  |  | 5 years |  |
Purchase price allocation, land acquired |  |  | $ 75,674,000 |  |
Purchase price allocation, buildings and improvements acquired |  |  | 38,205,000 |  |
Purchase price allocated to in-place leases |  |  | 9,058,000 |  |
Purchase price allocated to above market leases |  |  | $ 189,000 |  |
Applegreen PLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period |  | $ 68,710,000 |  |  |
Unitary lease initial term |  | 15 years |  |  |
Number of unitary lease renewal options | Option |  | 4 |  |  |
Unitary lease renewal term |  | 5 years |  |  |
Purchase price allocation, land acquired |  | $ 36,874,000 |  |  |
Purchase price allocation, buildings and improvements acquired |  | 27,431,000 |  |  |
Purchase price allocated to in-place leases |  | 4,548,000 |  |  |
Purchase price allocated to below market leases |  | 1,104,000 |  |  |
Purchase price allocated to above market leases |  | $ 961,000 |  |  |
Number of convenience stores and gasoline stations | Property |  | 33 |  |  |

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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 Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + 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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