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Summary of Significant Accounting Policies - Summary of Income from Discontinued Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations And Disposal Groups [Abstract]
Capitalized interest related to Discontinued Operations	$ 2,010crk_DisposalGroupIncludingDiscontinuedOperationsInterestCostsCapitalized	$ 9,582crk_DisposalGroupIncludingDiscontinuedOperationsInterestCostsCapitalized

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- Definition

Disposal group including discontinued operations interest costs capitalized

+ References

No definition available.

+ Details

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

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- Details

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