Weighted Average Shares of Unvested Restricted Stock (Detail) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Unvested restricted stock	1,717	1,635	1,728	1,665

Share based compensation arrangement by share based payment award equity instruments other than option nonvested weighted average number.

No definition available.

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Namespace Prefix:	crk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration