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Employee Benefit Plans (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Plan |  |  |
Liabilities, including the Company's common stock | $ 28,932,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent | $ 33,211,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent |
Savings Investment Plan |  |  |
Defined Contribution plans |  |  |
Contribution match on portion of employee salary (as a percent) | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / cog_DefinedContributionPlansAxis = cog_SavingsInvestmentPlanMember |  |
Discretionary profit sharing contribution Plan |  |  |
Discretionary profit sharing contribution match on portion of employee salary and bonus (as a percent) | 9.00%cog_DefinedContributionPlanMaximumAnnualContributionsPerEmployerPercent / cog_DefinedContributionPlansAxis = cog_SavingsInvestmentPlanMember |  |
Plan contributions charged to expense | 7,200,000 cog_DefinedContributionPlanCostRecognizedDiscretionary / cog_DefinedContributionPlansAxis = cog_SavingsInvestmentPlanMember | 6,900,000 cog_DefinedContributionPlanCostRecognizedDiscretionary / cog_DefinedContributionPlansAxis = cog_SavingsInvestmentPlanMember | 6,300,000 cog_DefinedContributionPlanCostRecognizedDiscretionary / cog_DefinedContributionPlansAxis = cog_SavingsInvestmentPlanMember
Deferred compensation plan |  |  |
Deferred Compensation Plan |  |  |
Market value of the trust assets, excluding the Company's common stock | 13,100,000 cog_DeferredCompensationMarketValueOfAssetsExcludingCommonStock / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember | 12,500,000 cog_DeferredCompensationMarketValueOfAssetsExcludingCommonStock / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember |
Liabilities, including the Company's common stock | 28,900,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember | 33,200,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember |
Number of common stock deferred into the rabbi trust (in shares) | 534,174 cog_CommonStockSharesVestedPerformanceShareAwardsHeldInEmployeeTrustShares / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember |  |
Company's common stock held in the rabbi trust | 5,700,000 us-gaap_CommonStockIssuedEmployeeTrustDeferred / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember | 5,700,000 us-gaap_CommonStockIssuedEmployeeTrustDeferred / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember |
Plan contributions charged to expense | 4,900,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember |  |
Company contributions to deferred compensation plan | $ 800,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember | $ 700,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember | $ 700,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / cog_DefinedContributionPlansAxis = cog_DeferredCompensationPlanMember

X
- Definition Represents the number of common stock representing vested performance share awards that were deferred into the rabbi trust. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the market value of the trust assets, excluding the entity's common stock. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | cog_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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- Definition Represents the plan contributions that are charged to expense. + References No definition available. + Details
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Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | cog_
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- Details
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- Definition Aggregate value 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 but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19850-108362 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19833-108362 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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Balance Type: | credit
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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