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Summary of Significant Accounting Policies - Common Stock Stock Options Excluded as Anti-Dilutive from Determination of Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Unit	Dec. 31, 2013 Unit	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted average anti-dilutive stock options	115us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	130us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	168us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Weighted average exercise price	$ 32.90crk_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice	$ 32.90crk_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice	$ 37.81crk_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice
Weighted average performance share units	323,000crk_AntiDilutiveSecuritiesPerformanceShareUnitsExcludedFromComputationOfEarningsPerShareAmount	75,000crk_AntiDilutiveSecuritiesPerformanceShareUnitsExcludedFromComputationOfEarningsPerShareAmount
Weighted average grant date fair value per unit	19.88crk_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageExercisePrice	20.92crk_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageExercisePrice

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- Definition

Antidilutive securities excluded from computation of earnings per share weighted average exercise price.

+ References

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- Definition

Antidilutive securities performance share units excluded from computation of earnings per share amount.

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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