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v2.4.1.9

Suspended Well Costs (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward] |  |  |
Capitalized Exploratory Well Costs Beginning Balance | $ 34,527 us-gaap_CapitalizedExploratoryWellCosts | $ 9,100 us-gaap_CapitalizedExploratoryWellCosts | $ 18,600 us-gaap_CapitalizedExploratoryWellCosts
Capitalized Exploratory Well Cost, Additions Pending Determination of Proved Reserves | 43,589 us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves | 34,527 us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves | 9,100 us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves | (33,340)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves | (9,100)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves | (5,865)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves
Capitalized Exploratory Well Cost, Charged to Expense | (1,187)us-gaap_CapitalizedExploratoryWellCostChargedToExpense | 0 us-gaap_CapitalizedExploratoryWellCostChargedToExpense | (12,735)us-gaap_CapitalizedExploratoryWellCostChargedToExpense
Capitalized Exploratory Well Costs Ending Balance | 43,589 us-gaap_CapitalizedExploratoryWellCosts | 34,527 us-gaap_CapitalizedExploratoryWellCosts | 9,100 us-gaap_CapitalizedExploratoryWellCosts
Exploratory Well Costs Capitalized Greater than One Year | $ 0 sm_ExploratoryWellCostsCapitalizedGreaterthanOneYear |  |

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- Definition Exploratory Well Costs Capitalized Greater than One Year + References No definition available. + Details
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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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- Definition Capitalized exploratory well costs that were expensed during the year because proved reserves were not found at the exploratory well. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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- Details
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- Definition Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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