DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Instruments (Detail) bbl in Thousands, £ in Millions	6 Months Ended
Jun. 30, 2019 GBP (£) MMBTU $ / MMBTU Counterparty bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties \| Counterparty	7
Put Options \| July—September 2019 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| bbl	2,484
Weighted Average Price Differential	(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	1,380
Weighted Average Price Differential	(3.72)
Collars \| January—December 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, weighted average floor price (USD per bbl)	1.20
Derivative, weighted average ceiling price (USD per bbl)	1.35
Derivative, notional amount \| £	£ 12.5
Basis Swap \| July—December 2019 \| Natural Gas \| NYMEX Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Price Differential \| MMBTU	(0.45)
Derivative, nonmonetary notional amount, energy \| MMBTU	7,360,000

Derivative, Number Of Counterparties

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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

No definition available.

+ Details

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- Definition

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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- Definition

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.

+ References

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- Definition

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

+ References

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+ Details

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

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