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

Disposal group including discontinued operations interest costs capitalized

No definition available.

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