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Supplemental Oil and Gas Disclosures - Capitalized Costs Related to Oil and Natural Gas Producing Activities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Proved oil and gas property	$ 5,156,875us-gaap_CapitalizedCostsProvedProperties	$ 3,713,525us-gaap_CapitalizedCostsProvedProperties
Less: Accumulated depreciation, depletion, amortization and impairment	(1,043,121)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	(612,380)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Proved oil and gas properties, net	4,113,754oas_ProvedOilAndGasPropertiesNet	3,101,145oas_ProvedOilAndGasPropertiesNet
Unproved oil and gas properties	809,265us-gaap_CapitalizedCostsUnprovedProperties	815,433us-gaap_CapitalizedCostsUnprovedProperties
Total oil and gas properties, net	$ 4,923,019us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet	$ 3,916,578us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet

X

- Definition

Oil and Gas properties with proved reserves under the successful effort method, net of accumulated depreciation, depletion, amortization and impairment.

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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

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Net amount of capitalized costs relating to oil and gas producing activities.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

+ References

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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-Publisher FASB

-Name Accounting Standards Codification

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