DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Instruments (Detail) MBbls in Thousands, £ in Millions	3 Months Ended
Mar. 31, 2020 GBP (£) $ / bbl Counterparty $ / MMBTU MBbls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties \| Counterparty	12
Fixed Price Swaps \| April—June 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	7,917
Derivative, weighted average fixed price	25.84
Fixed Price Swaps \| April—June 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	5,597
Derivative, weighted average fixed price	27.45
Fixed Price Swaps \| July—September 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	2,208
Derivative, weighted average fixed price	26.65
Fixed Price Swaps \| July—September 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	2,300
Derivative, weighted average fixed price	29.75
Collars \| July—September 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	2,208
Derivative, average floor sold price	20.00
Derivative average floor purchased price	25.00
Derivative, weighted average ceiling price (USD per bbl)	38.83
Collars \| July—September 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	874
Derivative, average floor sold price	20.00
Derivative average floor purchased price	25.00
Derivative, weighted average ceiling price (USD per bbl)	43.66
Collars \| October—December 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	1,748
Derivative, average floor sold price	15.00
Derivative average floor purchased price	20.00
Derivative, weighted average ceiling price (USD per bbl)	45.55
Collars \| October—December 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	1,518
Derivative, average floor sold price	15.00
Derivative average floor purchased price	20.00
Derivative, weighted average ceiling price (USD per bbl)	51.63
Collars \| January—December 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, weighted average ceiling price (USD per bbl) \| $ / MMBTU	1.38
Derivative, notional amount \| £	£ 13.5
Derivative, weighted average floor price (USD per bbl) \| $ / MMBTU	1.26
Put Options \| April—December 2020 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	19,835
Weighted average price differential	(2.10)

Derivative Average Floor Purchased Price

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Derivative Average Floor Sold Price

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- Definition

Derivative, Number Of Counterparties

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- Definition

Derivative, Weighted Average Price Differential

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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.

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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

No definition available.

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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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Nominal volume used to calculate payments on a derivative instrument.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

Average fixed price related to the group of price risk swap derivatives.

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