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Long-Term Debt - Additional Information 1 (Detail) - Revolving Credit Facility	12 Months Ended
	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Bank credit facility	$ 50,000,000
Maturity of credit facility	Mar. 04, 2019
Credit facility amount outstanding	$ 0
Spread rate over LIBOR for interest rate on credit facility	2.50%
Stated percentage over federal funds rate to calculate base rate	0.50%
Stated percentage over 30 day LIBOR to calculate base rate	1.00%
Spread rate over base rate for interest rate on credit facility	1.50%
Commitment fee on unused borrowing base	0.50%
Ratio of current assets to current liabilities	100.00%
Asset coverage ratio	250.00%

X

- Definition

Asset coverage ratio.

+ References

No definition available.

+ Details

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

X

- Definition

Line of credit facility amount outstanding.

+ References

No definition available.

+ Details

Name:	crk_LineOfCreditFacilityAmountOutstanding1
Namespace Prefix:	crk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Ratio of current assets to current liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Spread rate over base rate for interest rate on credit facility.

+ References

No definition available.

+ Details

Name:	crk_SpreadRateOverBaseRateForInterestRateOnCreditFacility
Namespace Prefix:	crk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stated percentage over federal funds rate to calculate base rate.

+ References

No definition available.

+ Details

Name:	crk_StatedPercentageOverFederalFundsRateToCalculateBaseRate
Namespace Prefix:	crk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stated percentage over thirty days Libor to calculate base rate.

+ References

No definition available.

+ Details

Name:	crk_StatedPercentageOverThirtyDaysLiborToCalculateBaseRate
Namespace Prefix:	crk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: