Summary of Significant Policies (Details 6) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Weighted average shares of unvested restricted stock
Unvested restricted stock	1,644	1,698	1,680	1,698

Name:

crk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedWeightedAverageNumber

Namespace Prefix:

crk

Data Type:

xbrli:sharesItemType

Balance Type:

na

Period Type:

duration