Financial Risk Management Activities - Additional Information (Detail)	6 Months Ended
Jun. 30, 2017 bbl / d $ / bbl
Midstream
Derivative [Line Items]
Percentage of average fixed rate	1.60%
Description of floating component	3-month LIBOR
Derivative maturity date	Jun. 30, 2020
Brent Crude Oil Price Collars
Derivative [Line Items]
Crude oil price collars to hedge from execution through December 31, 2017, barrels of oil per day \| bbl / d	20,000
Floor price	55
Ceiling price	75
West Texas Intermediate Crude Oil Price Collars
Derivative [Line Items]
Crude oil price collars to hedge from execution through December 31, 2017, barrels of oil per day \| bbl / d	60,000
Floor price	50
Ceiling price	70

Derivative nonmonetary notional amount volume of oil per day from execution through to year end.

No definition available.

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Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

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Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- 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

No definition available.

+ Details

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Period Type:	duration

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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Period Type:	duration

- Details

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- Details

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- Details

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