Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortization period of planned major maintenance activities, minimum	3 years
Amortization period of planned major maintenance activities, maximum	5 years
Deferred turnaround expenditures	$ 0	$ 0	$ 32,661,000
Depreciation expense excluded from cost of revenues	6,722,000	6,029,000	4,604,000
Depreciation expense excluded from operating expense	28,037,000	22,861,000	16,340,000
Depreciation expense excluded from general and administrative expense	$ 4,233,000	$ 2,929,000	2,108,000
Recognized Net gain (loss) due curtailments			3,100,000
Refining Equipment | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	8 years
Refining Equipment | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	47 years
Logistic | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	3 years
Logistic | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	30 years
Retail Site | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	3 years
Retail Site | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	30 years
Corporate | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	3 years
Corporate | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	7 years
Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
PP&E useful life	3 years
Accounting Standards Update 2017-07
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Recognized Net gain (loss) due curtailments			$ 3,100,000
Scenario, Forecast | Accounting Standards Update 2016-02
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset				$ 385,000,000
Operating lease, liability				$ 365,000,000