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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure Summary Of Significant Accounting Policies Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Beginning Balance, Gross |  | $ 0 | $ 10,222 | $ 137,555
Contract settlements reclassified to income, Gross |  |  | (10,222) | (120,443)
Change in unrealized deferred hedging gains (losses), Gross |  |  |  | (6,890)
Ending Balance, Gross |  |  | 0 | 10,222
Beginning Balance, Tax Effect |  | 0 | (3,986) | (53,646)
Contract settlements reclassified to income, Tax Effect |  |  | 3,986 | 46,973
Change in unrealized deferred hedging (losses) gains, tax effect |  |  |  | 2,687
Ending Balance, Tax Effect |  |  | 0 | (3,986)
Beginning Balance, Net of Tax |  | 0 | 6,236 | 83,909
Contract settlements reclassified to income, Net of Tax |  |  | (6,236) | (73,470)
Change in unrealized deferred hedging (losses) gains, net of taxes | [1] | $ 0 | 0 | (4,203)
Ending Balance, Net of Tax |  |  | $ 0 | $ 6,236
[1] | Amounts are net of income tax benefit of $2,687 for the year ended December 31, 2013.

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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 Disclosure summary of significant accounting policies accumulated other comprehensive income. + 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 Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes 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 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 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: 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=36458714&loc=d3e681-108580 Reference 3: 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=36458714&loc=SL7669686-108580 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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- Definition Amount of tax expense (benefit) 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 and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 + Details
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