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Derivatives - Open Commodity Derivative Contracts (Detail)
Jun. 30, 2013
MBbls
Oil Price Swaps | July 2013 - December 2013
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 6,211
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 99.19
Oil Price Swaps | January 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 7,511
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 92.42
Oil Price Swaps | January 2015 - December 2015
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 5,076
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 83.69
Natural Gas Price Swaps | July 2013 - December 2013
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 28,520
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 4.11
Oil Collars - Two Way | July 2013 - December 2013
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 84
Collar Range, minimum 80.00
Collar Range, maximum 102.50
Oil Collars - Three Way | January 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 8,213
Oil Collars - Three Way | January 2014 - December 2014 | Sold Put
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 70.00
Oil Collars - Three Way | January 2014 - December 2014 | Purchased Put
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 90.20
Oil Collars - Three Way | January 2014 - December 2014 | Sold Call
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, maximum 100.00
Oil Collars - Three Way | January 2015 - December 2015
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 2,920
Oil Collars - Three Way | January 2015 - December 2015 | Sold Put
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 73.13
Oil Collars - Three Way | January 2015 - December 2015 | Purchased Put
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, minimum 90.82
Oil Collars - Three Way | January 2015 - December 2015 | Sold Call
 
Derivative Instruments and Hedging Activities Disclosure  
Collar Range, maximum 103.13
Natural Gas Collars | July 2013 - December 2013
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 3,432
Collar Range, minimum 3.78
Collar Range, maximum 6.71
Natural Gas Collars | January 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 937
Collar Range, minimum 4.00
Collar Range, maximum 7.78
Natural Gas Collars | January 2015 - December 2015
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,010
Collar Range, minimum 4.00
Collar Range, maximum 8.55