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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Rent expense under noncancelable operating leases	$ 1.5us-gaap_OperatingLeasesRentExpenseNet	$ 1.4us-gaap_OperatingLeasesRentExpenseNet	$ 1.4us-gaap_OperatingLeasesRentExpenseNet
Commitments for contracted drilling services	15.3crk_CommitmentsForContractedDrillingServices
Contract term related to drilling rigs	Through November 2015
Natural gas transportation and treating agreements	Through July 2019
Maximum commitments under natural gas transportation and treating agreements	$ 11.5crk_MaximumCommitmentsUnderNaturalGasTransportationAgreements

X

- Definition

Commitments for contracted drilling services.

+ References

No definition available.

+ Details

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Namespace Prefix:	crk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract term related to drilling services.

+ References

No definition available.

+ Details

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Namespace Prefix:	crk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum commitments under natural gas transportation agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	crk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Natural gas transportation agreement term.

+ References

No definition available.

+ Details

Name:	crk_NaturalGasTransportationAgreementTerm
Namespace Prefix:	crk_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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Balance Type:	debit
Period Type:	duration