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Equity Method Investment (Details) (USD $) |  | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Apr. 30, 2012 Amended and Restated Limited Liability Company Agreement | Dec. 31, 2012 Amended and Restated Limited Liability Company Agreement | Feb. 29, 2012 Precedent Agreement with constitution Pipeline Company, LLC mi
Constitution Pipeline Company, LLC |  |  |  |
Length of pipeline to be constructed (in miles) |  |  |  | 120
Capacity owned by entity on newly constructed pipeline (in Mcf per day) |  |  |  | 500,000
Entity's equity interest in construction agreement (as a percent) |  | 25.00% |  |
Amount entity agreed to invest |  | $ 187,000,000 |  |
Contribution cap |  | 250,000,000 |  |
Number of years investment is expected to occur |  | 3 years |  |
Contributions |  |  | 6,900,000 |
Net book value | $ 6,915,000 |  | $ 6,900,000 |

X
- Definition Represents the capacity owned by the entity on the newly constructed pipeline under its development and construction agreement with Constitution Pipeline Company, LLC. + References No definition available. + Details
Name: | cog_DevelopmentAndConstructionAgreementCapacityOwnedByEntityPerDay
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the length of pipeline to be constructed under the development and construction agreement. + References No definition available. + Details
Name: | cog_DevelopmentAndConstructionAgreementLengthOfPipelineToBeConstructed
Namespace Prefix: | cog_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cog_JointlyOwnedPipelineInterestsLineItems
Namespace Prefix: | cog_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total period end amount of plant in service and construction in progress. + References No definition available. + Details
Name: | cog_JointlyOwnedPipelineNetOwnershipAmount
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the contribution cap of investment. + References No definition available. + Details
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Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the initial contribution to fund the initial cost associated with the project. + References No definition available. + Details
Name: | cog_JointlyOwnedPipelineNetOwnershipInitialContribution
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The proportionate share of interest (percent) in a jointly owned pipeline. + References No definition available. + Details
Name: | cog_JointlyOwnedPipelineProportionateOwnershipShare
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the period for which the investment is expected to occur. + References No definition available. + Details
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Namespace Prefix: | cog_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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=16385135&loc=d3e33749-111570 + Details
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