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Supplementary Information - Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Acquisition of Properties, Developed	$ 59us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	$ 7us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Acquisition of Properties, Undeveloped	0us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	0us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration Costs		8us-gaap_CostsIncurredExplorationCosts
Development Costs	$ 36,406us-gaap_CostsIncurredDevelopmentCosts	$ 25,912us-gaap_CostsIncurredDevelopmentCosts

X

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have 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 19

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447



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- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447



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- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

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-Subparagraph (c)

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- Definition

Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Exploration

-URI http://asc.fasb.org/extlink&oid=6512329



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-Name Accounting Standards Codification

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