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Summary of Significant Accounting Policies - Carrying Amounts and Estimated Fair Value of Other Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt, including current portion, Carrying Value	$ 1,070,445us-gaap_LongTermDebt	$ 798,700us-gaap_LongTermDebt
Fixed Rate Debt
Debt Instrument [Line Items]
Long-term debt, including current portion, Carrying Value	695,445us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crk_FixedRateDebtMember	588,700us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crk_FixedRateDebtMember
Long-term debt, including current portion, Fair Value	453,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = crk_FixedRateDebtMember	650,250us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = crk_FixedRateDebtMember
Floating Rate Debt
Debt Instrument [Line Items]
Long-term debt, including current portion, Carrying Value	375,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crk_VariableRateDebtMember	210,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crk_VariableRateDebtMember
Long-term debt, including current portion, Fair Value	$ 375,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = crk_VariableRateDebtMember	$ 210,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = crk_VariableRateDebtMember

X

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

X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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