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Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Period of service before an employee is eligible for contribution | 1 year |  |
Common stock authorized for issuance but not yet issued for ESPP | 248 cmg_CommonStockAuthorizedForIssuanceButNotYetIssuedForEspp |  |
Common stock authorized and reserved for ESPP | 250 cmg_CommonStockAuthorizedAndReservedForIssuanceEspp |  |
ESPP employee contribution, percentage | 15.00%cmg_EsppPercentOfBaseEarnings |  |
Shares issued under ESPP | 1 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 1 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 1 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Fair value of investments in rabbi trust | $ 16,147 us-gaap_TradingSecurities | $ 13,397 us-gaap_TradingSecurities |
Unrealized gains (losses) on investments held in rabbi trust | 184 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss | 722 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss | 240 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Deferred Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage on first 3% | 100.00%cmg_DeferredCompensationArrangementWithIndividualEmployerContributionPercentageOnFirst3Percent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |  |
Employer matching contribution, percentage on next 2% | 50.00%cmg_DeferredCompensationArrangementWithIndividualEmployerContributionPercentageOnNext2Percent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 100% under the Deferred Plan | 3.00%cmg_DeferredCompensationArrangementWithIndividualEmployerMatchingContributionOf100Percent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 50% under the Deferred Plan | 2.00%cmg_DeferredCompensationArrangementWithIndividualEmployerMatchingContributionOf50Percent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |  |
Deferred compensation matching contributions | 536 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember | 201 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember | 213 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Total liabilities under Deferred Plan | 16,147 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember | 13,397 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |
401(k) Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage on first 3% | 100.00%cmg_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchOnFirst3 / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember |  |
Employer matching contribution, percentage on next 2% | 50.00%cmg_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchOnNext2Percent / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 100% | 3.00%cmg_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayAtWhichEmployerMatches100Percent / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 50% | 2.00%cmg_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayAtWhichEmployerMatches50Percent / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember |  |
Period of service before an employee is eligible for contribution | 1 year |  |
Company matching contributions | $ 3,881 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember | $ 2,644 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember | $ 2,431 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = cmg_Plan401kMember

X
- Definition Common stock reserved for issuance under the Company's ESPP. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Common stock authorized for issuance but not yet issued for ESPP + References No definition available. + Details
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Namespace Prefix: | cmg_
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Balance Type: | na
Period Type: | instant

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- Definition Deferred Compensation Arrangement With Individual Employer Contribution Percentage On First 3 Percent + References No definition available. + Details
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- Definition Deferred Compensation Arrangement With Individual Employer Contribution Percentage On Next 2 Percent + References No definition available. + Details
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- Definition Deferred compensation arrangement with individual, employer matching contribution of 100 percent + References No definition available. + Details
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- Definition Deferred compensation arrangement with individual, employer matching contribution of 50 percent + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, at Which Employer Matches 100 Percent + References No definition available. + Details
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Balance Type: | na
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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, at Which Employer Matches 50 Percent + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Match On First 3% + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Match On Next 2 Percent + References No definition available. + Details
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Balance Type: | na
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- Definition The maximum percent an employee may contribute after one year of service with the Company. + References No definition available. + Details
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Namespace Prefix: | cmg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Eligibility period to contribute to the ESPP. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Eligibility period to receive matching contributions + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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