XML 27 R16.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Significant Accounting Policies - Additional Information 1 (Detail) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 27, 2018 USD ($) | Jun. 30, 2018 USD ($) a | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) a $ / bbl $ / Mcf | Jun. 30, 2017 USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Loss on sale of oil and gas properties |  | $ 6,838,000 |  | $ 35,438,000 |
Loss resulting from final settlement for property sale |  | 2,700,000 |  | 2,700,000 |
Impairment of oil and gas properties |  | 0 | $ 0 | 0 | $ 0
Cash flow hedges derivative instruments |  | $ 0 |  | $ 0 |
South Texas Sold Properties |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gross proceeds from sale of oil and gas properties | $ 125,000,000 |  |  |  |
Effective date of sale | Nov. 01, 2017 |  |  |  |
South Texas Asset Held for Sale |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Undeveloped Acres | a |  | 8,400 |  | 8,400 |
Assets held for sale, fair value |  | $ 55,000,000 |  | $ 55,000,000 |
Loss on sale of oil and gas properties |  | $ 4,100,000 |  | $ 32,700,000 |
Management's oil price outlook | $ / bbl |  |  |  | 72.03 |
Management's gas price outlook | $ / Mcf |  |  |  | 4.31 |
Annual minimum discount rate |  |  |  | 20.00% |
Annual maximum discount rate |  |  |  | 25.00% |

X
- Definition Effective date of sale. + References No definition available. + Details
Name: | crk_EffectiveDateOfSale
Namespace Prefix: | crk_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross proceeds from sale of oil and gas properties. + References No definition available. + Details
Name: | crk_GrossProceedsFromSaleOfOilAndGasProperties
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Management gas price outlook. + References No definition available. + Details
Name: | crk_ManagementGasPriceOutlook
Namespace Prefix: | crk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Management oil price outlook. + References No definition available. + Details
Name: | crk_ManagementOilPriceOutlook
Namespace Prefix: | crk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum discount factor to future net cash flows percentage. + References No definition available. + Details
Name: | crk_MaximumDiscountFactorToFutureNetCashFlowsPercentage
Namespace Prefix: | crk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum discount factor to future net cash flows percentage. + References No definition available. + Details
Name: | crk_MinimumDiscountFactorToFutureNetCashFlowsPercentage
Namespace Prefix: | crk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operations and summary of significant accounting policies. + References No definition available. + Details
Name: | crk_OperationsAndSummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | crk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Prior year final settlement for property sale. + References No definition available. + Details
Name: | crk_PriorYearFinalSettlementForPropertySale
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Undeveloped acres. + References No definition available. + Details
Name: | crk_UndevelopedAcres
Namespace Prefix: | crk_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
Name: | us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfOilAndGasProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
Name: | us-gaap_ImpairmentOfOilAndGasProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=crk_SouthTexasSoldPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=crk_SouthTexasAssetsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |