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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income, Net of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Beginning Balance, Oil Price Swap Agreements	$ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	$ 298us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Reclassification to earnings, Oil Price Swap Agreements	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	(298)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Changes in value, Oil Price Swap Agreements	0crk_OtherComprehensiveIncomeChangesInValueOfDerivative	0crk_OtherComprehensiveIncomeChangesInValueOfDerivative
Ending Balance, Oil Price Swap Agreements	0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Beginning Balance, Marketable Securities	4,418us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	20,178us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Reclassification to earnings, Marketable Securities	(5,120)crk_OtherComprehensiveIncomeReclassificationForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	(17,303)crk_OtherComprehensiveIncomeReclassificationForSaleOfSecuritiesIncludedInNetIncomeNetOfTax
Changes in value, Marketable Securities	702crk_OtherComprehensiveIncomeChangesInValueOfAvailableForSaleSecurities	1,543crk_OtherComprehensiveIncomeChangesInValueOfAvailableForSaleSecurities
Ending Balance, Marketable Securities	0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	4,418us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Beginning Balance, Total Accumulated Comprehensive Income	4,418us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	20,476us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Reclassification to earnings, Total Accumulated Comprehensive Income	(5,120)crk_OtherComprehensiveIncomeReclassificationAdjustmentIncludedInNetIncomeNetOfTax	(17,601)crk_OtherComprehensiveIncomeReclassificationAdjustmentIncludedInNetIncomeNetOfTax
Changes in value, Total Accumulated Comprehensive Income	702crk_OtherComprehensiveIncomeChangesInValue	1,543crk_OtherComprehensiveIncomeChangesInValue
Ending Balance, Total Accumulated Comprehensive Income	$ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 4,418us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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