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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Commitments And Contingencies [Line Items] |
Natural gas transportation contracts, 2021 | $ 21.5
Natural gas transportation contracts, 2022 | 31.2
Natural gas transportation contracts, 2023 through 2030 | $ 24.8
Contract cancellable term related to drilling services | 45 days
Commitments for contracted drilling services | $ 6.0
Maximum |
Commitments And Contingencies [Line Items] |
Contract term related to drilling services | 1 year

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- Definition Commitments and contingencies. + References No definition available. + Details
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Namespace Prefix: | crk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | crk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract terms related to drilling services cancellable. + References No definition available. + Details
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Namespace Prefix: | crk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractual Obligation, to be Paid, after Year Two + References No definition available. + Details
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Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |