Commitments and Contingencies Additional Information (Detail)	3 Months Ended	8 Months Ended
	Mar. 31, 2017 USD ($) claim	Mar. 31, 2017 USD ($) claim
Long-term Purchase Commitment [Line Items]
Multiplier for earnout payment before EBITDA	4	4
Minimum EBITDA benchmark	$ 3,500,000.0	$ 3,500,000.0
Maximum earnout payment amount	4,500,000.0	4,500,000.0
Site contingency, recovery from third party of Environmental remediation cost	3,500,000	9,700,000
Environmental costs recognized, capitalized in period	$ 1,500,000	$ 11,100,000
Number of remaining claim to be resolved | claim	2	2
Bankruptcy claims amount of claims to be settled	$ 22,400,000	$ 22,400,000
Estimated value of claims remaining to be settled	500,000	500,000
Maximum bankruptcy claims remaining	$ 22,400,000	$ 22,400,000
Predecessor working ownership percentage	3.40%	3.40%
Allowed claims, settlement ratio	0.0544
Tesoros
Long-term Purchase Commitment [Line Items]
Deductible for indemnification obligation	$ 1,000,000
Indemnification obligation cap	15,000,000	$ 15,000,000
Clear Air Act Violation
Long-term Purchase Commitment [Line Items]
Final decree high estimate	30,000,000
Pending Litigation
Long-term Purchase Commitment [Line Items]
Claim amount for environmental losses (more than)	1,000,000	1,000,000
Wyoming Refinery One
Long-term Purchase Commitment [Line Items]
Environmental remediation expense	$ 18,000,000	18,000,000
Environmental costs recognized, period for recognition of one third costs	5 years
Environmental costs recognized, period for recognition	30 years
Wyoming Refinery Two | Wastewater Treatment Pond
Long-term Purchase Commitment [Line Items]
Environmental remediation expense	$ 500,000	500,000
Wyoming Refinery Two | Waste Water Treatment System
Long-term Purchase Commitment [Line Items]
Environmental remediation expense	11,600,000	11,600,000
Wyoming Refinery
Long-term Purchase Commitment [Line Items]
Loss contingency, range of possible loss	$ 100,000	$ 100,000