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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 | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Derivative Financial Instruments [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | $ (24,109) | $ 137,760 | $ (170,959) | $ 40,776
Gain (Loss) Recognized in Income (Ineffective Portion) | 0 |  | 0 | (2,891)
Derivative Fair Value Income (Loss) | (24,109) | 137,760 | (170,959) | 37,885
Swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | (38,521) | 65,003 | (82,593) | 21,927
Gain (Loss) Recognized in Income (Ineffective Portion) |  |  |  | (1,995)
Derivative Fair Value Income (Loss) | (38,521) | 65,003 | (82,593) | 19,932
Re-purchased swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  | (1,663) |  | (478)
Derivative Fair Value Income (Loss) |  | (1,663) |  | (478)
Collars |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | 1,032 | 74,420 | (38,116) | 19,417
Gain (Loss) Recognized in Income (Ineffective Portion) |  |  |  | (896)
Derivative Fair Value Income (Loss) | 1,032 | 74,420 | (38,116) | 18,521
Basis swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | 13,380 |  | (50,250) | (90)
Derivative Fair Value Income (Loss) | $ 13,380 |  | $ (50,250) | $ (90)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + 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 (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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