Commitments and Contingencies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Store	Dec. 31, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Environmental liabilities	$ 3,400,000	$ 3,600,000
Other Assets [Member]
Commitments And Contingencies Disclosure [Abstract]
Indemnification assets related to third party escrow funds, state funds or insurance	3,000,000	$ 3,200,000
Assets Held-for-sale [Member]
Recorded Third Party Environmental Recoveries [Line Items]
Maximum possible civil penalties per day if violates FTC divestiture orders	$ 41,000
Assets Held-for-sale [Member] | Circle K Stores Inc. [Member]
Recorded Third Party Environmental Recoveries [Line Items]
Number of stores divested | Store	9