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Commitments and Contingencies Additional Information (Detail) | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2016 USD ($) claim
Long-term Purchase Commitment [Line Items] |  |
Multiplier for earnout payment before EBITDA |  | 4
Minimum EBITDA benchmark |  | $ 3,500,000.0
Maximum earnout payment amount |  | 4,500,000.0
Site contingency reimbursement |  | 4,700,000
Site contingencies capital expenditures |  | $ 7,100,000
Number of remaining claim to be resolved | claim |  | 2
Bankruptcy claims amount of claims to be settled |  | $ 22,400,000
Estimated value of claims remaining to be settled |  | 600,000
Maximum bankruptcy claims remaining |  | $ 22,400,000
Predecessor working ownership percentage |  | 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
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
Wyoming Refinery One |  |
Long-term Purchase Commitment [Line Items] |  |
Environmental remediation expense |  | $ 20,000,000
Environmental costs recognized, period for recognition of one third costs |  | 5 years
Environmental costs recognized, period for recognition |  | 30 years
Wyoming Refinery Two [Member] | Wastewater Treatment Pond |  |
Long-term Purchase Commitment [Line Items] |  |
Environmental remediation expense |  | $ 2,100,000
Wyoming Refinery Two [Member] | Waste Water Treatment System |  |
Long-term Purchase Commitment [Line Items] |  |
Environmental remediation expense |  | 11,600,000
Wyoming Refinery [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Loss contingency, range of possible loss, maximum |  | $ 100,000

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