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Supplemental Information on Oil and Gas Producing Activities - Capitalized Costs Relating to Oil and Gas Producing Activities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Capitalized Costs Relating to Oil and Gas Producing Activities: |  |  |  |  |  |
Properties not being amortized | $ 47,290 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative |  | $ 88,194 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative |  | $ 66,794 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative |
Properties being amortized | 347,186 us-gaap_CapitalizedCostsAssetRetirementCosts | [1] | 222,032 us-gaap_CapitalizedCostsAssetRetirementCosts | [1] | 195,329 us-gaap_CapitalizedCostsAssetRetirementCosts | [1]
Total capitalized costs | 394,476 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross |  | 310,226 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross |  | 262,123 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross |
Less accumulated depreciation, depletion, and amortization | (289,272)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities |  | (171,854)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities |  | (155,681)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities |
Net capitalized costs | $ 105,204 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet |  | $ 138,372 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet |  | $ 106,442 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet |
[1] | Includes $5.2 million, $5.2 million, and $4.7 million asset retirement cost in 2014, 2013, and 2012, respectively.

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- Definition Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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- Definition The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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- Definition The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 + Details
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- Definition The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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- Definition Net amount of capitalized costs relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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