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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
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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