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Derivatives - Open Commodity Derivative Contracts (Detail)	3 Months Ended
	Sep. 30, 2013 MBbls
Oil Price Swaps | October 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf)	3,494
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	99.48
Oil Price Swaps | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf)	8,813
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	92.98
Oil Price Swaps | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf)	6,614
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	85.25
Natural Gas Price Swaps | October 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf)	12,420
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	4.11
Oil Collars - Two Way | October 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf)	42
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 | October 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf)	1,716
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

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- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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Nominal volume used to calculate payments on a derivative instrument.

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Average fixed price related to the group of price risk swap derivatives.

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