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Derivative Activities - Schedule of Realized Gains from Cash Flow Hedges and Other Hedges Reclassified from Accumulated Other Comprehensive Income (Detail) - Reclassification out of Accumulated Other Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue | $ 247,510 | $ 765,524 | $ 710,142 | $ 1,222,866
Realized Gain (Loss) Reclassified from OCI into Revenue |  | 3,046 |  | 4,286
Tax Effect |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue |  | (1,866) |  | (2,790)
Swaps | Before Tax |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue |  | 1,052 |  | 1,888
Collars | Before Tax |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Realized Gain (Loss) Reclassified from OCI into Revenue |  | $ 3,860 |  | $ 5,188

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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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