Property Acquisitions - Additional Information (Detail) $ in Thousands		6 Months Ended
	Jun. 03, 2015 USD ($) Lease Options SimpleInterests	Jun. 30, 2015 USD ($) Property
Business Acquisition [Line Items]
Number of gasoline stations and convenience stores acquired during the period | Property		78
Maximum [Member]
Business Acquisition [Line Items]
Unitary triple-net lease agreements initial terms		20 years
Unitary triple-net lease agreements successive terms		20 years
Apro, LLC (d/b/a United Oil) [Member]
Business Acquisition [Line Items]
Number of Triple-Net Unitary Leases | Lease	3
Lease agreements description		Initial terms of 20 years and options for up to three successive five year renewal options.
Unitary triple-net lease agreements initial terms	20 years
Unitary triple-net lease agreements successive terms	5 years
Number of lease renewal options | Options	3
Apro, LLC (d/b/a United Oil) [Member] | Maximum [Member]
Business Acquisition [Line Items]
Number of lease renewal options | Lease	3
Pacific Convenience and Fuels LLC [Member]
Business Acquisition [Line Items]
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period		$ 216,900
Pacific Convenience and Fuels LLC [Member] | Apro, LLC (d/b/a United Oil) [Member]
Business Acquisition [Line Items]
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period	$ 214,500
Number of fee simple interests acquired in convenience store and retail motor fuel stations from affiliates | SimpleInterests	77
Land [Member] | Gasoline Stations and Convenience Store Properties [Member]
Business Acquisition [Line Items]
Purchase price allocation, assets acquired	$ 142,357
Buildings and Equipment [Member] | Gasoline Stations and Convenience Store Properties [Member]
Business Acquisition [Line Items]
Purchase price allocation, assets acquired	75,664
Land Building and Equipment [Member] | Gasoline Stations and Convenience Store Properties [Member]
Business Acquisition [Line Items]
Purchase price allocated to above market leases	112
Purchase price allocated to below market leases	19,552
Purchase price allocated to in-place lease and other intangible assets	16,136
Transaction cost related to acquisition	$ 413