XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Long-Term Debt - Additional Information 1 (Detail) - Revolving Credit Facility | 6 Months Ended
--- | ---
Jun. 30, 2018 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%
Current ratio | 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 Current ratio. + References No definition available. + Details
Name: | crk_CurrentRatio
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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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_LineOfCreditFacilityMaximumBorrowingCapacity
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: |