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Derivative Instruments - Oil and Natural-Gas Production/Processing Derivative Activities Table (Detail) - Not Designated as Hedging Instrument [Member] - Price Risk Derivative [Member]
9 Months Ended
Sep. 30, 2015
MMBTU / d
MBbls / d
$ / bbl
$ / MMBTU
Three-Way Collars Natural Gas 2015 [Member]  
Derivative [Line Items]  
Natural-gas derivative nonmonetary notional amount per day | MMBTU / d 635,000
Three-Way Collars Natural Gas 2015 [Member] | Call Option [Member] | Short [Member]  
Average price per MMBtu or barrel  
Average ceiling price | $ / MMBTU 4.76
Three-Way Collars Natural Gas 2015 [Member] | Put Option [Member] | Short [Member]  
Average price per MMBtu or barrel  
Average floor price | $ / MMBTU 2.75
Three-Way Collars Natural Gas 2015 [Member] | Put Option [Member] | Long [Member]  
Average price per MMBtu or barrel  
Average floor price | $ / MMBTU 3.75
Forward Contracts Natural Gas 2016 [Member]  
Derivative [Line Items]  
Natural-gas derivative nonmonetary notional amount per day | MMBTU / d 34,000
Average price per MMBtu or barrel  
Average price per MMBtu or barrel | $ / MMBTU 3.18
Extendable Fixed Price Contracts Natural Gas 2015 [Member]  
Derivative [Line Items]  
Natural-gas derivative nonmonetary notional amount per day | MMBTU / d 170,000 [1]
Average price per MMBtu or barrel  
Average price per MMBtu or barrel | $ / MMBTU 4.17
Three Way Collars Oil 2016 [Member]  
Derivative [Line Items]  
Oil or NGL derivative nonmonetary notional amount per day | MBbls / d 28
Three Way Collars Oil 2016 [Member] | Call Option [Member] | Short [Member]  
Average price per MMBtu or barrel  
Average ceiling price 69.29
Three Way Collars Oil 2016 [Member] | Put Option [Member] | Short [Member]  
Average price per MMBtu or barrel  
Average floor price 46.43
Three Way Collars Oil 2016 [Member] | Put Option [Member] | Long [Member]  
Average price per MMBtu or barrel  
Average floor price 61.43
Forward Contracts NGLs 2015 [Member]  
Derivative [Line Items]  
Oil or NGL derivative nonmonetary notional amount per day | MBbls / d 7
Average price per MMBtu or barrel  
Average price per MMBtu or barrel 14.09
Forward Contracts NGLs 2016 [Member]  
Derivative [Line Items]  
Oil or NGL derivative nonmonetary notional amount per day | MBbls / d 3
Average price per MMBtu or barrel  
Average price per MMBtu or barrel 14.87
[1] The extendable fixed-price contracts have a contract term of January 2015 to December 2015 with an option for the counterparty to extend the contract term to December 2016 at the same price.