101 - Document - Document and Entity Information
link:calculationLink
link:presentationLink
link:definitionLink
103 - Statement - Consolidated Balance Sheets
link:calculationLink
link:presentationLink
link:definitionLink
104 - Statement - Consolidated Balance Sheets (Parenthetical)
link:calculationLink
link:presentationLink
link:definitionLink
105 - Statement - Consolidated Statements of Income (Unaudited)
link:calculationLink
link:presentationLink
link:definitionLink
106 - Statement - Consolidated Statements of Income (Unaudited) (Parenthetical)
link:calculationLink
link:presentationLink
link:definitionLink
107 - Statement - Consolidated Statements of Cash Flows (Unaudited)
link:calculationLink
link:presentationLink
link:definitionLink
108 - Disclosure - Description of business
link:calculationLink
link:presentationLink
link:definitionLink
109 - Disclosure - Principles of consolidation and basis of presentation
link:calculationLink
link:presentationLink
link:definitionLink
110 - Disclosure - Use of estimates
link:calculationLink
link:presentationLink
link:definitionLink
111 - Disclosure - Properties and equipment
link:calculationLink
link:presentationLink
link:definitionLink
112 - Disclosure - Notes payable
link:calculationLink
link:presentationLink
link:definitionLink
113 - Disclosure - Description of leasing arrangements
link:calculationLink
link:presentationLink
link:definitionLink
114 - Disclosure - Petroleum storage facility and environmental incidents
link:calculationLink
link:presentationLink
link:definitionLink
115 - Disclosure - Income taxes
link:calculationLink
link:presentationLink
link:definitionLink
116 - Disclosure - Operating segment disclosures
link:calculationLink
link:presentationLink
link:definitionLink
117 - Disclosure - Fair value of financial instruments
link:calculationLink
link:presentationLink
link:definitionLink
118 - Disclosure - Principles of consolidation and basis of presentation (Policies)
link:calculationLink
link:presentationLink
link:definitionLink
119 - Disclosure - Properties and equipment (Tables)
link:calculationLink
link:presentationLink
link:definitionLink
120 - Disclosure - Income taxes (Tables)
link:calculationLink
link:presentationLink
link:definitionLink
121 - Disclosure - Operating segment disclosures (Tables)
link:calculationLink
link:presentationLink
link:definitionLink
122 - Disclosure - Description of Business - Additional Information (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
123 - Disclosure - Properties and Equipment - Properties and Equipment (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
124 - Disclosure - Notes Payable - Additional Information (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
125 - Disclosure - Description of Leasing Arrangements - Additional Information (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
126 - Disclosure - Petroleum Storage Facility and Environmental Incidents - Additional Information (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
127 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
128 - Disclosure - Operating Segment Disclosures - Additional Information (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
129 - Disclosure - Operating Segment Disclosures - Financial Information Used for Making Operating Decisions and Assessing Performance (Detail)
link:calculationLink
link:presentationLink
link:definitionLink
130 - Disclosure - Operating Segment Disclosures - Reconciliation of Segment Information (Detail)
link:calculationLink
link:presentationLink
link:definitionLink