XML 87 R69.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Income Taxes - Carryforwards Available to Reduce Future Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Carryforward Available To Reduce Future Income Taxes [Line Items] |  |
Alternative minimum tax credits carryforward | $ 20,435 | $ 20,435
U.S. Federal |  |
Carryforward Available To Reduce Future Income Taxes [Line Items] |  |
Net operating loss, Years of Expiration Carryforward | 2017 – 2036 |
Net operating loss, Tax Credit Carryforward, Amount | $ 745,190 |
State Taxes |  |
Carryforward Available To Reduce Future Income Taxes [Line Items] |  |
Net operating loss, Years of Expiration Carryforward | 2020 – 2036 |
Net operating loss, Tax Credit Carryforward, Amount | $ 1,521,847 |
Years of Expiration Carryforward Unlimited |  |
Carryforward Available To Reduce Future Income Taxes [Line Items] |  |
Alternative minimum tax credits carryforward | $ 20,435 |

X
- Definition Carryforward Available To Reduce Future Income Taxes + References No definition available. + Details
Name: | crk_CarryforwardAvailableToReduceFutureIncomeTaxesLineItems
Namespace Prefix: | crk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax credits carryforward expiration dates. + References No definition available. + Details
Name: | crk_TaxCreditsCarryforwardExpirationDates
Namespace Prefix: | crk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=crk_YearsOfExpirationCarryforwardUnlimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |