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Summary of Significant Accounting Policies - Additional Information 4 (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Customer Segment	Dec. 31, 2013 Customer	Dec. 31, 2012 Customer
Operations And Summary Of Significant Accounting Policies [Line Items]
Number of operating segments	1us-gaap_NumberOfOperatingSegments
Number of major customers of oil and gas sales	2crk_NumberOfMajorCustomerOfOilAndGasSales	2crk_NumberOfMajorCustomerOfOilAndGasSales	2crk_NumberOfMajorCustomerOfOilAndGasSales
General and administrative expenses reimbursements of overhead costs	$ 13.2crk_GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts	$ 11.9crk_GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts	$ 11.5crk_GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts
Performance multiplier, minimum	0.00%crk_PerformanceUnitsAdjustmentForPerformanceMultiplierRangeMinimum
Performance multiplier, maximum	300.00%crk_PerformanceUnitsAdjustmentForPerformanceMultiplierRangeMaximum
Interest costs, capitalized during period	$ 10.2us-gaap_InterestCostsCapitalized	$ 4.7us-gaap_InterestCostsCapitalized	$ 20.9us-gaap_InterestCostsCapitalized
Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding	1,207,527us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	1,515,889us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	1,960,835us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Major Purchaser One
Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage accounted of oil and gas sales	53.00%crk_PercentageAccountedOfOilAndGasSales / us-gaap_MajorCustomersAxis = crk_MajorPurchaserOneMember	51.00%crk_PercentageAccountedOfOilAndGasSales / us-gaap_MajorCustomersAxis = crk_MajorPurchaserOneMember	42.00%crk_PercentageAccountedOfOilAndGasSales / us-gaap_MajorCustomersAxis = crk_MajorPurchaserOneMember
Major Purchaser Two
Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage accounted of oil and gas sales	35.00%crk_PercentageAccountedOfOilAndGasSales / us-gaap_MajorCustomersAxis = crk_MajorPurchaserTwoMember	36.00%crk_PercentageAccountedOfOilAndGasSales / us-gaap_MajorCustomersAxis = crk_MajorPurchaserTwoMember	27.00%crk_PercentageAccountedOfOilAndGasSales / us-gaap_MajorCustomersAxis = crk_MajorPurchaserTwoMember

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General and administrative expense reimbursements of overhead costs.

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Number of major customer of oil and gas sales.

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Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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