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v2.4.1.9

Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 Segment Institution | Dec. 31, 2013 Institution | Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of operating segments | 1 cog_ReportingSegmentsNumber |  |
Cash and Cash Equivalents |  |  |
Number of financial institutions | 1 cog_CashAndCashEquivalentsNumberOfFinancialInstitutions | 2 cog_CashAndCashEquivalentsNumberOfFinancialInstitutions |
Properties and Equipment |  |  |
Amortization of unproved properties included in depreciation, depletion, and amortization | $ 17,400,000 cog_AmortizationOfUnprovedProperties | $ 53,600,000 cog_AmortizationOfUnprovedProperties | $ 18,100,000 cog_AmortizationOfUnprovedProperties
Assets legally restricted for purposes of settling asset retirement obligations | $ 0 us-gaap_AssetRetirementObligationLegallyRestrictedAssetsFairValue |  |
Gathering and pipeline systems and equipment | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 10 years |  |
Gathering and pipeline systems and equipment | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 25 years |  |
Pipeline and transmission systems | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 12 years |  |
Pipeline and transmission systems | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 25 years |  |
Gathering and compression equipment | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 10 years |  |
Storage equipment and facilities | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 10 years |  |
Storage equipment and facilities | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 16 years |  |
Buildings | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 25 years |  |
Buildings | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 40 years |  |
Other assets | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 3 years |  |
Other assets | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 10 years |  |

X
- Definition Represents the noncash expense charged against earnings to recognize amortization of unproved properties based on past drilling and development experience and average property lives, included in depreciation, depletion, and amortization in the consolidated statement of operations. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the number of financial institutions wherein cash and cash equivalents are primarily concentrated. + References No definition available. + Details
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- Definition The number of reportable segments of the entity. + References No definition available. + Details
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- Definition Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- 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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- Details
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