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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
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Mar. 31, 2014 | Mar. 31, 2013
Derivative Financial Instruments [Line Items] |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | $ (146,850) | $ (96,984)
Gain (Loss) Recognized in Income (Ineffective Portion) | 0 | (2,891)
Derivative fair value loss | (146,850) | (99,875)
Swaps |  |
Derivative Financial Instruments [Line Items] |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | (44,073) | (43,076)
Gain (Loss) Recognized in Income (Ineffective Portion) |  | (1,995)
Derivative fair value loss | (44,073) | (45,071)
Re-purchased swaps |  |
Derivative Financial Instruments [Line Items] |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) |  | 1,185
Derivative fair value loss |  | 1,185
Collars |  |
Derivative Financial Instruments [Line Items] |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | (39,148) | (55,003)
Gain (Loss) Recognized in Income (Ineffective Portion) |  | (896)
Derivative fair value loss | (39,148) | (55,899)
Call options |  |
Derivative Financial Instruments [Line Items] |  |
Gain (Loss) Recognized in Income (Non-hedge Derivatives) | (63,629) | (90)
Derivative fair value loss | $ (63,629) | $ (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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