Summary of Significant Accounting Policies - Summary of Income from Discontinued Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
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