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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized and reserved for issuances	3,360us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Shares authorized but not issued	1,288cmg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedButNotIssued
Expiration period of SOSARs	7 years
Compensation expense related to employees eligible to retire and retain full rights to the awards, recognition period	6 months
Stock-based compensation expense	$ 97,618us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	$ 64,781us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	$ 66,274us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
Stock-based compensation expense, net of tax	60,084us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	39,465us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	40,361us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Stock only stock appreciation rights (SOSARs) granted	764us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	672us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	617us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
SOSARs outstanding	2,087us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,690us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,449us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,486us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Total intrinsic value of options and SOSARs exercised	88,245us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	91,178us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	183,097us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Outstanding, end of year, shares	70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	120us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	207us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Cumulative cash flow from operations measurement period	3 years
Shares vested, fair value	783us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	58,941us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	31,309us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Stock Options And SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation	43,757us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = cmg_StockOptionsAndStockAppreciationRightsSRSMember
Weighted average period	1 year 6 months
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, end of year, shares	66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Performance SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock only stock appreciation rights (SOSARs) granted	220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = cmg_PerformanceSosarsMember	191us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = cmg_PerformanceSosarsMember	191us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = cmg_PerformanceSosarsMember
SOSARs outstanding	656us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = cmg_PerformanceSosarsMember
Performance SOSARs that have met Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SOSARs outstanding	341us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = cmg_PerformanceSosarsThatHaveMetPerformanceConditionsMember
Non-Vested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation	22,396us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = cmg_NonVestedStockAwardsMember
Weighted average period	1 year 9 months 18 days
Leasehold Improvements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized as capitalized development	$ 1,178us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_LeaseholdImprovementsMember	$ 1,124us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_LeaseholdImprovementsMember	$ 1,998us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_LeaseholdImprovementsMember
Alternative 2 [Member] | Stock Options And SOSARs [Member] | First Half Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for SOSARs	2 years
Alternative 2 [Member] | Stock Options And SOSARs [Member] | Second Half Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for SOSARs	3 years

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Unrecognized cost of unvested share-based compensation awards.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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