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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 50

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Derivative Activities - Effects of Non-Hedge Derivatives on Consolidated Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)									$ 383,520	$ (58,895)	$ 40,312
Gain (Loss) Recognized in Income (Ineffective Portion)									0	(2,930)	1,125
Derivative Fair Value Income (Loss)	412,422	142,057	(24,109)	(146,850)	(59,355)	(40,355)	137,760	(99,875)	383,520	(61,825)	41,437
Swaps
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)									367,484	(48,492)	11,601
Gain (Loss) Recognized in Income (Ineffective Portion)										(2,034)	(657)
Derivative Fair Value Income (Loss)									367,484	(50,526)	10,944
Re-purchased swaps
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)										1,323	9,313
Derivative Fair Value Income (Loss)										1,323	9,313
Collars
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)									42,836	(15,166)	5,126
Gain (Loss) Recognized in Income (Ineffective Portion)										(896)	1,782
Derivative Fair Value Income (Loss)									42,836	(16,062)	6,908
Basis Swaps
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)									(26,800)	3,440	1,124
Derivative Fair Value Income (Loss)									(26,800)	3,440	1,124
Call options
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)											13,178
Derivative Fair Value Income (Loss)											13,178
Put options
Derivative Financial Instruments [Line Items]
Gain (Loss) Recognized in Income (Non-hedge Derivatives)											(30)
Derivative Fair Value Income (Loss)											$ (30)