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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes [Line Items] |  |  |  |
Federal statutory rate | 35.00% | 35.00% | 35.00% | 35.00%
Income tax expense (benefit) | $ (134,781) | $ 93,522 | $ (174,390) | $ 230,455
Deferred compensation plan |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | (2,600) |  | (3,500) |
Valuation Allowance, Operating Loss Carryforwards | Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | 28,500 |  | 28,500 |
Valuation Allowance, Operating Loss Carryforwards | State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | $ 8,500 |  | $ 19,800 |

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- Definition Income taxes. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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