XML 69 R51.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Long-Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 06, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 05, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal |  | $ 1,165,433,000 |  |  |  |  |  |  |  |  | $ 1,165,433,000 |
Gain on extinguishment of debt |  | (1,064,000) | $ 100,540,000 | $ 56,196,000 | $ 33,380,000 | $ 23,155,000 | $ 51,054,000 | $ 7,267,000 | $ (2,735,000) |  | 189,052,000 | $ 78,741,000
Unamortized debt issuance costs |  | $ 16,183,000 |  |  |  | $ 19,670,000 |  |  |  |  | $ 16,183,000 | 19,670,000
Loss from write-off of deferred loan costs |  |  |  |  |  |  |  |  |  |  |  | $ 3,700,000
10 % Senior Secured Toggle Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 10.00% |  |  |  | 10.00% |  |  |  |  | 10.00% | 10.00%
Principal |  | $ 697,195,000 |  |  |  |  |  |  |  |  | $ 697,195,000 |
Interest payment terms |  |  |  |  |  |  |  |  |  |  | payable on March 15 and September 15, and the notes mature on March 15, 2020 |
Maturity of senior notes |  |  |  |  |  |  |  |  |  |  | Mar. 15, 2020 |
Accrued interest by issuing additional notes |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
Interest rate on senior notes, payment in kind |  |  |  |  |  |  |  |  |  |  | 12.25% |
Additional notes outstanding |  | $ 91,900,000 |  |  |  |  |  |  |  |  | $ 91,900,000 |
10 % Senior Secured Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 10.00% |  |  |  | 10.00% |  |  |  |  | 10.00% | 10.00%
Principal | $ 2,800,000 | $ 2,805,000 |  |  |  | $ 700,000,000 |  |  |  |  | $ 2,805,000 | $ 700,000,000
7 3/4% Convertible Second Lien PIK Notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 7.75% |  |  |  | 7.75% |  |  |  |  | 7.75% | 7.75%
Principal |  | $ 268,432,000 |  |  |  |  |  |  |  |  | $ 268,432,000 |
Interest payment terms |  |  |  |  |  |  |  |  |  |  | payable on April 1 and October 1, |
Maturity of senior notes |  |  |  |  |  |  |  |  |  |  | Apr. 01, 2019 |
7 3/4% Senior Notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 7.75% |  |  |  | 7.75% |  |  |  |  | 7.75% | 7.75%
Principal amount of notes repurchased |  |  |  |  |  | $ 23,900,000 |  |  |  | $ 87,500,000 |  | $ 23,900,000
Principal | 18,000,000 | $ 17,959,000 |  |  |  | $ 376,090,000 |  |  |  |  | $ 17,959,000 | $ 376,090,000
9½ % Convertible Second Lien PIK Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 9.50% |  |  |  | 9.50% |  |  |  |  | 9.50% | 9.50%
Principal |  | $ 174,182,000 |  |  |  |  |  |  |  |  | $ 174,182,000 |
Interest payment terms |  |  |  |  |  |  |  |  |  |  | payable on June 15 and December 15, |
Maturity of senior notes |  |  |  |  |  |  |  |  |  |  | Jun. 15, 2020 |
Interest payment commencing date |  |  |  |  |  |  |  |  |  |  | Dec. 15, 2016 |
9 1/2% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  | 9.50% |  |  |  | 9.50% |  |  |  |  | 9.50% | 9.50%
Principal amount of notes repurchased |  |  |  |  |  | $ 105,600,000 |  |  |  | $ 19,800,000 |  | $ 105,600,000
Principal | $ 4,900,000 | $ 4,860,000 |  |  |  | $ 194,367,000 |  |  |  |  | $ 4,860,000 | 194,367,000
Aggregate purchase price of debt |  |  |  |  |  |  |  |  |  |  |  | 42,700,000
7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 89,600,000 |
Common stock shares exchanged for repayment of principal amount |  |  |  |  |  |  |  |  |  | 2,748,403 |  |
Gain on repurchased amount of notes |  |  |  |  |  |  |  |  |  |  |  | $ 82,400,000
Convertible Second Lien PIK Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument convertible conversion ratio |  |  |  |  |  |  |  |  |  |  | 0.0812 |
Debt instrument convertible threshold consecutive trading days period |  |  |  |  |  |  |  |  |  |  | 15 days |
Convertible Second Lien PIK Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Daily volume weighted average price |  |  |  |  |  |  |  |  |  |  | $ 12.32 |
Exchange Offer |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding senior notes | 98.00% |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable | 1,917,342 |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | 10 % Senior Secured Toggle Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued | $ 697,200,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes | 10.00% |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  | $ 4,500,000 |
Exchange Offer | 10 % Senior Secured Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes | 10.00% |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes repurchased | $ 697,200,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on exchange of debt | 0 |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | 7 3/4% Convertible Second Lien PIK Notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued | $ 270,600,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes | 7.75% |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | 7 3/4% Senior Notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes | 7.75% |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes repurchased | $ 270,600,000 |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | 9½ % Convertible Second Lien PIK Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued | $ 169,700,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes | 9.50% |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | 9 1/2% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes | 9.50% |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes repurchased | $ 169,700,000 |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | 7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt | 106,200,000 |  |  |  |  |  |  |  |  |  |  |
Exchange Offer | Convertible Second Lien PIK Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs | $ 6,500,000 |  |  |  |  |  |  |  |  |  |  |
Payment In Cash | 7 3/4% Senior Notes due 2019 and 9 1/2% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes exchanged in cash |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |

X
- Definition Daily volume weighted average price. + References No definition available. + Details
Name: | crk_DailyVolumeWeightedAveragePrice
Namespace Prefix: | crk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument, convertible, percentage of debt converted. + References No definition available. + Details
Name: | crk_DebtInstrumentConvertiblePercentageOfDebtConverted
Namespace Prefix: | crk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument, interest rate, payment in kind. + References No definition available. + Details
Name: | crk_DebtInstrumentInterestRatePaymentInKind
Namespace Prefix: | crk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt restructuring costs. + References No definition available. + Details
Name: | crk_DebtRestructuringCosts
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain (losses) on conversion of debt. + References No definition available. + Details
Name: | crk_GainLossesOnConversionOfDebt
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Long term debt principal amount. + References No definition available. + Details
Name: | crk_LongTermDebtPrincipalAmount
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum accrued interest payable in kind. + References No definition available. + Details
Name: | crk_MaximumAccruedInterestPayableInKind
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum notes issuable for toggle interest paid in kind. + References No definition available. + Details
Name: | crk_MaximumNotesIssuableForToggleInterestPaidInKind
Namespace Prefix: | crk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
Name: | us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Conversion Rate -URI http://asc.fasb.org/extlink&oid=6509012 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentDateOfFirstRequiredPayment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 when the debt instrument is scheduled to be fully repaid, 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment. + 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 210.5-02.22(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentPaymentTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase. + References No definition available. + Details
Name: | us-gaap_GainLossOnRepurchaseOfDebtInstrument
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_SeniorSecuredToggleNotesTenPercentDueTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_SeniorSecuredNotesTenPercentDueTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_ConvertibleSecondLienPaymentInKindNotesSevenPointSevenFivePercentDueTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_SeniorNotesSevenPointSevenFivePercentDueTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_ConvertibleSecondLienPaymentInKindNotesNinePointFivePercentDueTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_SeniorNotesNinePointFivePercentDueTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_SeniorNotesSevenPointSevenFivePercentDueTwoThousandNineteenAndSeniorNotesNinePointFivePercentDueTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=crk_ConvertibleSecondLienPaymentInKindNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtConversionByUniqueDescriptionAxis=crk_ExchangeOfferMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtConversionByUniqueDescriptionAxis=crk_PaymentInCashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |