XML 38 R27.htm IDEA: XBRL DOCUMENT
v3.20.2

Summary of Significant Accounting Policies - Schedule of Gains and Losses from Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (121,579) | $ 24,858 | $ (71,978) | $ 31,945
Natural gas price derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | (120,706) | 22,664 | (82,872) | 37,722
Oil price derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | (989) | 2,194 | 13,529 | (5,777)
Interest rate derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ 116 | $ 0 | $ (2,635) | $ 0

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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=crk_NaturalGasPriceDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=crk_OilPriceDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=crk_InterestRateDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |