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Stock-Based Compensation (Details 6) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Deferred Compensation Plan |
Decrease in rabbi trust deferred compensation liability | $ 4.3 us-gaap_DefinedContributionPlanCostRecognized
Deferred Performance Shares |
Deferred Compensation Plan |
Number of common stock deferred into the rabbi trust (in shares) | 534,174 cog_CommonStockSharesHeldInEmployeeTrustSharesEarnedButNotDistributed / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember
Number of shares sold | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember

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- Definition Number of shares of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees. Shares have been earned but not distributed. + References No definition available. + Details
Name: | cog_CommonStockSharesHeldInEmployeeTrustSharesEarnedButNotDistributed
Namespace Prefix: | cog_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |