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Oil and Gas Reserves Information (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Extractive Industries [Abstract]
Percentage of discount factor	10.00%	10.00%

X

- Definition

Percentage of discount factor.

+ References

No definition available.

+ Details

Name:	crk_PercentageOfDiscountFactor
Namespace Prefix:	crk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ExtractiveIndustriesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration