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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net deferred tax assets (liabilities) | $ (720,566,000) |  |  |  | $ (736,226,000) |  |  |  | $ (720,566,000) | $ (736,226,000) |
Valuation allowance on the deferred compensation plan | 3,000,000 |  |  |  |  |  |  |  | 3,000,000 |  |
Deductible limit | 1,000,000 |  |  |  |  |  |  |  | 1,000,000 |  |
Regular net operating loss carryforwards | 354,200,000 |  |  |  |  |  |  |  | 354,200,000 |  |
Alternative minimum tax carryforwards | 304,700,000 |  |  |  |  |  |  |  | 304,700,000 |  |
Deferred tax asset related to regular NOL | 39,000,000 |  |  |  |  |  |  |  | 39,000,000 |  |
Accrued interest or penalties related to tax amounts | 0 |  |  |  |  |  |  |  | 0 |  |
Total income tax | (28,323,000) | 11,866,000 | 97,494,000 | (47,180,000) | 29,964,000 | (29,074,000) | 39,007,000 | (27,843,000) | 33,857,000 | 12,054,000 | 35,557,000
Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  | Dec. 31, 2033 |  |
Deferred compensation plan |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowance on the deferred compensation plan | 11,400,000 |  |  |  |  |  |  |  | 11,400,000 |  |
Capital loss carryforwards |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Valuation allowance on the deferred compensation plan | 363,000 |  |  |  |  |  |  |  | 363,000 |  |
2014 |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expect to utilize federal net operating loss carryforwards |  |  |  |  |  |  |  |  | 250,000,000 |  |
Expect to utilize alternative minimum tax net operating loss carryforwards |  |  |  |  |  |  |  |  | 245,000,000 |  |
Alternative Minimum Tax |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
AMT credit carryforwards that are not subject to limitation or expiration | 665,000 |  |  |  |  |  |  |  | 665,000 |  |
Current |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability related to net deferred hedging gains included in AOCI | $ 3,987,000 |  |  |  | $ 49,124,000 |  |  |  | $ 3,987,000 | $ 49,124,000 |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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