Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
Sep. 30, 2015 |
Dec. 31, 2014 |
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| Commitments And Contingencies [Line Items] | ||
| Accrued liabilities for remediation | $ 1.1 | $ 0.6 |
| Maximum potential undiscounted payments | 1.9 | |
| Contractual commitments to acquire property, plant and equipment | 49.6 | |
| Environmental Loss Contingency [Member] | MPC [Member] | ||
| Commitments And Contingencies [Line Items] | ||
| Receivables from MPC for indemnification of environmental costs | $ 0.1 | $ 0.0 |
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- Definition Commitments And Contingencies [Line Items] No definition available.
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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