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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Change in Hedge Derivative Fair Value |  |  |  |  |  |  | $ (4,203) |
Realized Gain (Loss) Reclassified from OCI into Revenue | 616,615 |  | 442,038 |  | 1,839,481 |  | 1,434,633 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue | 2,172 | [1] | 17,155 | [1] | 6,458 | [1] | 59,974 | [1]
Tax Effect |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Change in Hedge Derivative Fair Value |  |  |  |  |  |  | 2,687 |
Tax Effect | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue | (1,332) | [1] | (10,967) | [1] | (4,122) | [1] | (38,343) | [1]
Swaps | Before Tax |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Change in Hedge Derivative Fair Value |  |  |  |  |  |  | 125 |
Swaps | Before Tax | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue | 1,255 | [1] | 2,765 | [1] | 3,144 | [1] | 14,687 | [1]
Collars | Before Tax |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Change in Hedge Derivative Fair Value |  |  |  |  |  |  | (7,015) |
Collars | Before Tax | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue | $ 2,249 | [1] | $ 25,357 | [1] | $ 7,436 | [1] | $ 83,630 | [1]
[1] | For realized gains upon derivative contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in revenues. See additional discussion above regarding the discontinuance of hedge accounting.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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