v3.8.0.1

Derivative Instruments and Fair Value Measurements - Commodity Derivatives Volumes and Prices (Detail)	12 Months Ended
	Dec. 31, 2017 MMBTU $ / bbl $ / MMBTU bbl
Crude Oil January 2018 – December 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	300
Contract Price	50.00
Crude Oil January 2018 – March 2018 Contract [Member] | Collar [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	1,000
Crude Oil January 2018 – March 2018 Contract [Member] | Collar [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Contract Price	50.00
Crude Oil January 2018 – March 2018 Contract [Member] | Collar [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Contract Price	55.05
Crude Oil January 2018 – June 2018 Contract [Member] | Collar [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	500
Crude Oil January 2018 – June 2018 Contract [Member] | Collar [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Contract Price	55.00
Crude Oil January 2018 – June 2018 Contract [Member] | Collar [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Contract Price	60.00
Natural Gas January 2018 - December 2018 Contract One [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | MMBTU	200,000
Contract Price | $ / MMBTU	3.085
Natural Gas January 2018 - December 2018 Contract Two [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | MMBTU	250,000
Contract Price | $ / MMBTU	3.084
NGLs (C3 - Propane) January 2018 - March 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	450
Contract Price	30.24
NGLs (IC4 - Isobutane) January 2018 - March 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	50
Contract Price	36.12
NGLs (NC4 - Butane) January 2018 - March 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	150
Contract Price	35.70
Crude Oil January 2018 – September 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	700
Contract Price	60.50
Crude Oil April 2018 – September 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	800
Contract Price	60.50
NGLs (C2 - Ethane) February 2018 - December 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	1,000
Contract Price	11.424
NGLs (C3 - Propane) February 2018 - December 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	600
Contract Price	32.991
NGLs (IC4 - Isobutane) February 2018 - December 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	50
Contract Price	38.262
NGLs (NC4 - Butane) February 2018 - December 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	200
Contract Price	38.22
NGLs (C5 - Pentane) January 2018 - December 2018 Contract [Member] | Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted | bbl	200
Contract Price	56.364

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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Balance Type:	na
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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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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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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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