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Equity Method Investments (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Apr. 30, 2012 mi | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2014 mi
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net book value |  | $ 68,029,000 us-gaap_EquityMethodInvestments | $ 26,892,000 us-gaap_EquityMethodInvestments |  |
Constitution Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Length of pipeline to be constructed (in miles) | 124 cog_DevelopmentAndConstructionAgreementLengthOfPipelineToBeConstructed / us-gaap_CounterpartyNameAxis = cog_ConstitutionPipelineMember |  |  |  |
Contribution cap | 250,000,000 cog_JointlyOwnedPipelineNetOwnershipContributionCap / us-gaap_CounterpartyNameAxis = cog_ConstitutionPipelineMember |  |  |  |
Expected contribution in future years |  | 139,700,000 cog_JointlyOwnedPipelineNetOwnershipExpectedContribution / us-gaap_CounterpartyNameAxis = cog_ConstitutionPipelineMember |  |  |
Number of year's investment expected for contribution |  | 2 years |  |  |
Contributions |  | 34,200,000 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_CounterpartyNameAxis = cog_ConstitutionPipelineMember | 18,900,000 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_CounterpartyNameAxis = cog_ConstitutionPipelineMember | 6,900,000 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_CounterpartyNameAxis = cog_ConstitutionPipelineMember |
Central Penn Line |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Length of pipeline to be constructed (in miles) |  |  |  |  | 177 cog_DevelopmentAndConstructionAgreementLengthOfPipelineToBeConstructed / us-gaap_CounterpartyNameAxis = cog_CentralPipeLineMember
Expected contribution in future years |  | 135,300,000 cog_JointlyOwnedPipelineNetOwnershipExpectedContribution / us-gaap_CounterpartyNameAxis = cog_CentralPipeLineMember |  |  |
Number of years investment is expected to occur, new pipeline |  | 3 years |  |  |
Central Penn Line | Transcontinental Gas Pipe Line Company LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Entity's equity interest in construction agreement (as a percent) |  |  |  |  | 61.00%cog_JointlyOwnedPipelineProportionateOwnershipShare / us-gaap_CounterpartyNameAxis = cog_CentralPipeLineMember / dei_LegalEntityAxis = cog_TranscontinentalGasPipeLineCompanyLLCMember
Constitution Pipeline Company, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Entity's equity interest in construction agreement (as a percent) | 25.00%cog_JointlyOwnedPipelineProportionateOwnershipShare / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_ConstitutionPipelineCompanyLLCMember |  |  |  |
Net book value |  | 64,300,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_ConstitutionPipelineCompanyLLCMember | 26,900,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_ConstitutionPipelineCompanyLLCMember |  |
Meade Pipeline Co LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Contributions |  | 3,900,000 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_MeadePipelineCoLLCMember |  |  |
Net book value |  | $ 3,800,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_MeadePipelineCoLLCMember |  |  |
Ownership interest (as a percent) |  |  |  |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_MeadePipelineCoLLCMember
Meade Pipeline Co LLC | Central Penn Line |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Entity's equity interest in construction agreement (as a percent) |  |  |  |  | 39.00%cog_JointlyOwnedPipelineProportionateOwnershipShare / us-gaap_CounterpartyNameAxis = cog_CentralPipeLineMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_MeadePipelineCoLLCMember

X
- Definition Represents the length of pipeline to be constructed under the development and construction agreement. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Represents the contribution cap of investment. + References No definition available. + Details
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- Definition Represents the contributions to fund the cost associated with the project for the period. + References No definition available. + Details
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- Definition Represents the amount of expected contribution to be made by the entity for fund cost associated with the jointly owned pipeline in future years. + References No definition available. + Details
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Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
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- Definition The proportionate share of interest (percent) in a jointly owned pipeline. + References No definition available. + Details
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X
- Definition Represents the period for which the investment is expected for contribution. + References No definition available. + Details
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- Definition Represents the period for which the investment is expected to occur. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Details
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- Details
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- Details
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- Details
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