Derivative Instruments and Fair Value Measurements - Outstanding Commodity Derivatives Volumes and Prices (Detail)	3 Months Ended
Mar. 31, 2018 MMBTU $ / bbl $ / MMBTU bbl
Crude Oil April 2018 – December 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	300
Contract Price	50.00
Crude Oil April 2018 – June 2018 Contract [Member] \| Collar [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	500
Crude Oil April 2018 – June 2018 Contract [Member] \| Collar [Member] \| Minimum [Member]
Derivatives Fair Value [Line Items]
Contract Price	55.00
Crude Oil April 2018 – June 2018 Contract [Member] \| Collar [Member] \| Maximum [Member]
Derivatives Fair Value [Line Items]
Contract Price	60.00
Crude Oil April 2018 – September 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	1,500
Contract Price	60.50
Natural Gas April 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 April 2018 - December 2018 Contract Two [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| MMBTU	250,000
Contract Price \| $ / MMBTU	3.084
NGLs (C2 - Ethane) April 2018 - December 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	1,000
Contract Price	11.424
NGLs (C3 - Propane) April 2018 - December 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	600
Contract Price	32.991
NGLs (IC4 - Isobutane) April 2018 - December 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	50
Contract Price	38.262
NGLs (NC4 - Butane) April 2018 - December 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	200
Contract Price	38.22
NGLs (C5 - Pentane) April 2018 - December 2018 Contract [Member] \| Swap [Member]
Derivatives Fair Value [Line Items]
Volume Transacted \| bbl	200
Contract Price	56.364

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

No definition available.

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Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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- 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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- 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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