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Summary of Significant Accounting Policies - Net Changes in Capitalized Exploratory Well Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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]
Beginning of period	$ 123,215us-gaap_CapitalizedExploratoryWellCosts	$ 40,424us-gaap_CapitalizedExploratoryWellCosts	$ 20,207us-gaap_CapitalizedExploratoryWellCosts
Exploratory well cost additions (pending determination of proved reserves)	336,344us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	346,814us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	160,813us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves
Exploratory well cost reclassifications (successful determination of proved reserves)	(425,037)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	(264,023)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	(140,091)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves
Exploratory well dry hole costs (unsuccessful in adding proved reserves)	0us-gaap_ResultsOfOperationsDryHoleCosts	0us-gaap_ResultsOfOperationsDryHoleCosts	(505)us-gaap_ResultsOfOperationsDryHoleCosts
End of period	$ 34,522us-gaap_CapitalizedExploratoryWellCosts	$ 123,215us-gaap_CapitalizedExploratoryWellCosts	$ 40,424us-gaap_CapitalizedExploratoryWellCosts

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Dry hole costs from oil and gas producing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Section 25

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 23

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration