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Summary of Significant Accounting Policies - 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
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Beginning Balance, Gross | $ 137,555 |  | $ 254,678 |  | $ 111,062 |
Contract settlements reclassified to income, Gross | (120,443) |  | (236,305) |  | (132,201) |
Change in unrealized deferred hedging gains, Gross | (6,890) |  | 119,182 |  | 275,817 |
Ending Balance, Gross | 10,222 |  | 137,555 |  | 254,678 |
Beginning Balance, Tax Effect | (53,646) |  | (98,051) |  | (43,592) |
Contract settlements reclassified to income, Tax Effect | (46,973) | [1] | (91,871) | [1] | 50,005 |
Change in unrealized deferred hedging (losses) gains, tax effect | 2,687 |  | (47,466) |  | (104,464) |
Ending Balance, Tax Effect | (3,986) |  | (53,646) |  | (98,051) |
Beginning Balance, Net of Tax | 83,909 |  | 156,627 |  | 67,470 |
Contract settlements reclassified to income, Net of Tax | (73,470) |  | (144,434) |  | (82,196) |
Change in unrealized deferred hedging (losses) gains, net of taxes | (4,203) | [2] | 71,716 | [2] | 171,353 | [2]
Ending Balance, Net of Tax | $ 6,236 |  | $ 83,909 |  | $ 156,627 |
[1] | 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.
[2] | 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.

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- Definition Amount of tax related to increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes taxes related to net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Amount before tax of reclassification adjustment 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 after tax of reclassification adjustment 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 Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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