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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

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