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Summary of Significant Accounting Policies - Summary of Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Other Current Assets [Line Items]
Other Current Assets	$ 10,105us-gaap_OtherAssetsCurrent	$ 2,905us-gaap_OtherAssetsCurrent
Derivative settlements receivable
Schedule Of Other Current Assets [Line Items]
Other Current Assets	7,890us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_DerivativeSettlementsReceivableMember	139us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_DerivativeSettlementsReceivableMember
Pipe and oil field equipment inventory
Schedule Of Other Current Assets [Line Items]
Other Current Assets	1,379us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_PipeInventoryMember	1,388us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_PipeInventoryMember
Derivative financial instruments
Schedule Of Other Current Assets [Line Items]
Other Current Assets		970us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Drilling advances
Schedule Of Other Current Assets [Line Items]
Other Current Assets	311us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_DrillingAdvancesMember
Prepaid expenses
Schedule Of Other Current Assets [Line Items]
Other Current Assets	487us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_PrepaidExpensesMember	350us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_PrepaidExpensesMember
Other
Schedule Of Other Current Assets [Line Items]
Other Current Assets	$ 38us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_OtherOtherCurrentAssetsMember	$ 58us-gaap_OtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = crk_OtherOtherCurrentAssetsMember

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- Definition

Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

+ 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 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

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