DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Instruments (Detail) bbl in Thousands, MMBTU in Thousands, £ in Millions	12 Months Ended
Dec. 31, 2018 GBP (£) MMBTU Counterparty $ / MMBTU $ / bbl bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties \| Counterparty	12
Put Options \| January—September 2019 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume (bbl) \| bbl	7,371
Weighted Average Price Differential (USD per bbl) \| $ / bbl	(8.60)
Put Options \| October—December 2019 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume (bbl) \| bbl	1,380
Weighted Average Price Differential (USD per bbl) \| $ / bbl	(3.72)
Collars \| January—June 2019 \| Natural Gas \| NYMEX Henry Hub
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, energy measure \| MMBTU	18,100
Derivative, weighted average floor price (USD per MMBtu)	3.00
Derivative, weighted average ceiling price (USD per bbl)	3.92
Collars \| January—December 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, weighted average floor price (USD per MMBtu)	1.20
Derivative, weighted average ceiling price (USD per bbl)	1.35
Derivative, notional amount \| £	£ 150
Finanical Basis Swaps \| January—June 2019 \| Natural Gas \| NYMEX Henry Hub
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential (USD per bbl)	(0.53)
Derivative, nonmonetary notional amount, energy measure \| MMBTU	32,580
Finanical Basis Swaps \| January—March 2019 \| Natural Gas \| NYMEX Henry Hub
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential (USD per bbl)	(0.54)
Derivative, nonmonetary notional amount, energy measure \| MMBTU	1,350
Finanical Basis Swaps \| January—December 2019 \| Natural Gas \| NYMEX Henry Hub
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential (USD per bbl)	(0.45)
Derivative, nonmonetary notional amount, energy measure \| MMBTU	14,600

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- Definition

Derivative, Weighted Average Price Differential

+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

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The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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