v3.10.0.1

Derivative Instruments and Fair Value Measurements - Outstanding Commodity Derivatives Volumes and Prices (Detail) - Swap [Member]	6 Months Ended
	Jun. 30, 2018 MMBTU $ / bbl $ / MMBTU bbl
Crude Oil July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	300
Contract Price | $ / bbl	50.00
Crude Oil July 2018 – September 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	1,500
Contract Price | $ / bbl	60.50
CMA Roll July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	2,000	[1]
Contract Price | $ / bbl	0.66	[1]
Natural Gas July 2018 – December 2018 Contract One [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | MMBTU	200,000
Contract Price | $ / MMBTU	3.085
Natural Gas July 2018 – December 2018 Contract Two [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | MMBTU	250,000
Contract Price | $ / MMBTU	3.084
NGLs (C2 - Ethane) July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	1,000
Contract Price | $ / bbl	11.424
NGLs (C3 - Propane) July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	600
Contract Price | $ / bbl	32.991
NGLs (IC4 - Isobutane) July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	50
Contract Price | $ / bbl	38.262
NGLs (NC4 - Butane) July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	200
Contract Price | $ / bbl	38.22
NGLs (C5 - Pentane) July 2018 – December 2018 Contract [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	200
Contract Price | $ / bbl	56.364
[1] Designated as a cash flow hedge

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in energy volume but not the derivative contract itself.

+ References

No definition available.

+ Details

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

X

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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