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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Unrealized hedging gains, income tax benefit		$ 161crk_OtherComprehensiveIncomeUnrealizedHedgingGainsLossesNetOfTaxTaxAmount
Net change in fair value of marketable securities, income tax benefit	$ 2,380crk_OtherComprehensiveIncomeNetUnrealizedGainsLossesOnMarketableSecuritiesNetOfTaxTaxAmount	$ 8,487crk_OtherComprehensiveIncomeNetUnrealizedGainsLossesOnMarketableSecuritiesNetOfTaxTaxAmount

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- Definition

Other comprehensive income net unrealized gains losses on marketable securities net of tax, tax amount.

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- Definition

Other comprehensive income unrealized hedging gains losses net of tax tax amount.

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No definition available.

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