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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 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 | $ 1.3
Contract term related to drilling services | through September 2019
Commitments for contracted drilling services | $ 19.3

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