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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
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  | $ (58,895) | $ 40,312 | $ 30,543
Gain (Loss) Recognized in Income (Ineffective Portion) |  |  |  |  |  |  |  |  | (2,930) | 1,125 | 9,544
Derivative fair value (loss) income | (59,355) | (40,355) | 137,760 | (99,875) | (5,571) | (40,728) | 148,569 | (60,833) | (61,825) | 41,437 | 40,087
Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  | (48,492) | 11,601 | 24,767
Gain (Loss) Recognized in Income (Ineffective Portion) |  |  |  |  |  |  |  |  | (2,034) | (657) | 767
Derivative fair value (loss) income |  |  |  |  |  |  |  |  | (50,526) | 10,944 | 25,534
Re-purchased swaps |  |  |  |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  | 1,323 | 9,313 |
Derivative fair value (loss) income |  |  |  |  |  |  |  |  | 1,323 | 9,313 |
Collars |  |  |  |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  | (15,166) | 5,126 | 5,266
Gain (Loss) Recognized in Income (Ineffective Portion) |  |  |  |  |  |  |  |  | (896) | 1,782 | 8,777
Derivative fair value (loss) income |  |  |  |  |  |  |  |  | (16,062) | 6,908 | 14,043
Call options |  |  |  |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  |  | 13,178 | 553
Derivative fair value (loss) income |  |  |  |  |  |  |  |  |  | 13,178 | 553
Put options |  |  |  |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  |  | (30) |
Derivative fair value (loss) income |  |  |  |  |  |  |  |  |  | (30) |
Basis swaps |  |  |  |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  |  |  |  |  |  |  |  | 3,440 | 1,124 | (43)
Derivative fair value (loss) income |  |  |  |  |  |  |  |  | $ 3,440 | $ 1,124 | $ (43)

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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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