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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Current tax, U.S. Federal	$ 248,219us-gaap_CurrentFederalTaxExpenseBenefit	$ 165,731us-gaap_CurrentFederalTaxExpenseBenefit	$ 166,386us-gaap_CurrentFederalTaxExpenseBenefit
Current tax, U.S. State	41,225us-gaap_CurrentStateAndLocalTaxExpenseBenefit	39,136us-gaap_CurrentStateAndLocalTaxExpenseBenefit	31,231us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current tax, Foreign	156us-gaap_CurrentForeignTaxExpenseBenefit	63us-gaap_CurrentForeignTaxExpenseBenefit	125us-gaap_CurrentForeignTaxExpenseBenefit
Current tax, Total	289,600us-gaap_CurrentIncomeTaxExpenseBenefit	204,930us-gaap_CurrentIncomeTaxExpenseBenefit	197,742us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax, U.S. Federal	(13,890)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	5,238us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(16,024)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred tax, U.S. State	(6,740)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(3,105)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(2,013)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax, Foreign	(3,075)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(1,330)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(1,578)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred tax, Total	(23,705)cmg_DeferredIncomeTaxesTotal	803cmg_DeferredIncomeTaxesTotal	(19,615)cmg_DeferredIncomeTaxesTotal
Valuation allowance	3,034us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	1,300us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	1,558us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Provision for income taxes	$ 268,929us-gaap_IncomeTaxExpenseBenefit	$ 207,033us-gaap_IncomeTaxExpenseBenefit	$ 179,685us-gaap_IncomeTaxExpenseBenefit

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations, excluding valuation allowance adjustments.

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