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Summary of Significant Accounting Policies - Additional Information 1 (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net book value of unproved properties | $ 943,200,000 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod |  |  |  | $ 807,000,000 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod |  |  |  | $ 943,200,000 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod | $ 807,000,000 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod |
Abandonment and impairment of unproved properties | 14,308,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 13,444,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 9,332,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 9,995,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 5,852,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 11,692,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 19,156,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 15,218,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 47,079,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 51,918,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense | 125,278,000 us-gaap_ExplorationAbandonmentAndImpairmentExpense
Useful life of assets |  |  |  |  |  |  |  |  | 10 years |  |
Depreciation expense |  |  |  |  |  |  |  |  | 12,900,000 us-gaap_Depreciation | 13,200,000 us-gaap_Depreciation | 13,200,000 us-gaap_Depreciation
Unamortized debt issuance costs | 42,200,000 us-gaap_UnamortizedDebtIssuanceExpense |  |  |  | 44,500,000 us-gaap_UnamortizedDebtIssuanceExpense |  |  |  | 42,200,000 us-gaap_UnamortizedDebtIssuanceExpense | 44,500,000 us-gaap_UnamortizedDebtIssuanceExpense |
Marketable securities | 68,500,000 us-gaap_MarketableSecurities |  |  |  | 67,800,000 us-gaap_MarketableSecurities |  |  |  | 68,500,000 us-gaap_MarketableSecurities | 67,800,000 us-gaap_MarketableSecurities |
Other investments | $ 10,300,000 us-gaap_OtherInvestments |  |  |  | $ 9,000,000 us-gaap_OtherInvestments |  |  |  | $ 10,300,000 us-gaap_OtherInvestments | $ 9,000,000 us-gaap_OtherInvestments |
Minimum | Associated assets |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  |  |  |  | 5 years |  |
Minimum | Other property and equipment |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  |  |  |  | 3 years |  |
Maximum | Associated assets |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  |  |  |  | 10 years |  |
Maximum | Other property and equipment |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  |  |  |  | 10 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 40 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6475089&loc=d3e66625-109467 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6475089&loc=d3e66584-109467 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475089&loc=d3e66610-109467 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Oil and Gas properties with unproved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 + Details
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