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Derivative Activities - Effects of Cash Flow Hedges and Other Hedges on Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Change in Hedge Derivative Fair Value | $ (6,890) |  | $ 119,182 |  | $ 275,817 |
Change in unrealized deferred hedging gains, tax effect | 2,687 |  | (47,466) |  | (104,464) |
Change in Hedge Derivative Fair value, effects of Cash flow hedges on accumulated other comprehensive income (loss) total | (4,203) | [1] | 71,716 | [1] | 171,353 | [1]
Realized Gain Reclassified from AOCI into Revenue, Income taxes | (46,973) | [2] | (91,871) | [2] | 50,005 |
Realized gain on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes | 73,470 | [2] | 144,434 | [2] |  |
Swaps |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Change in Hedge Derivative Fair Value | 125 |  | 46,371 |  |  |
Realized Gain Reclassified from OCI into Revenue | 15,171 | [2] | 78,779 | [2] |  |
Put options |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Change in Hedge Derivative Fair Value |  |  | (1,955) |  |  |
Realized Gain Reclassified from OCI into Revenue |  |  | (1,955) | [2] |  |
Collars |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |
Change in Hedge Derivative Fair Value | (7,015) |  | 74,766 |  |  |
Realized Gain Reclassified from OCI into Revenue | $ 105,272 | [2] | $ 159,481 | [2] |  |
[1] | Amounts are net of income tax benefit of $2,687 for the year ended December 31, 2013 compared to income tax expense of $47,466 for the year ended December 31, 2012 and income tax expense of $104,464 for the twelve months ended December 31, 2011.
[2] | For realized gains upon contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.

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- Definition The amount of gains on a cash flow hedge reclassified in the period to revenues from accumulated other comprehensive income. + References No definition available. + Details
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- Definition Tax effect from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges, ineffective portion on designated derivatives reclassified, and the amortization of frozen OCI associated with the de-designated derivatives. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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