SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted Average Shares of Unvested Restricted Stock (Detail) - shares shares in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Accounting Policies [Abstract]
Unvested restricted stock (in shares)	1,846	1,968	2,049	2,208

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

No definition available.

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