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Summary of Significant Accounting Policies - Summary of Unaudited Pro Forma Financial Information (Parenthetical) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Pro Forma
Transaction-related costs	$ 2.6

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- Definition

Transaction related costs contribution transaction.

+ References

No definition available.

+ Details

Name:	crk_TransactionRelatedCostsContributionTransaction
Namespace Prefix:	crk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ProFormaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: