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Commitments and Contingencies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Natural gas transportation and treating agreements	through July 2019
Maximum commitments under natural gas transportation and treating agreements	$ 1.0
Contract term related to drilling services	through September 2019
Commitments for contracted drilling services	$ 16.5

X

- Definition

Commitments for contracted drilling services.

+ References

No definition available.

+ Details

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

X

- Definition

Contract terms related to drilling services.

+ References

No definition available.

+ Details

Name:	crk_ContractTermsRelatedToDrillingServices
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

Name:	crk_MaximumCommitmentsUnderNaturalGasTransportationAgreements
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:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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