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Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 region segment item | Dec. 31, 2013 | Dec. 31, 2012
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of regions | 8 cmg_NumberOfRegionsInWhichEntityOperates |  |
Number of reportable segments | 1 us-gaap_NumberOfReportableSegments |  |
Unredeemed gift card sales percentage | 4.00%cmg_UnredeemedGiftCardSalesPercentage | 4.00%cmg_UnredeemedGiftCardSalesPercentage | 5.00%cmg_UnredeemedGiftCardSalesPercentage
Gift card breakage revenue recognition period | 6 months |  |
Gift card breakage recognized | $ 3,146 us-gaap_RevenueRecognitionGiftCardsBreakage | $ 1,976 us-gaap_RevenueRecognitionGiftCardsBreakage | $ 2,070 us-gaap_RevenueRecognitionGiftCardsBreakage
Investment impairment charges | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities
Investment maturity term | 2 years |  |
Acquisition, development and construction of restaurant capitalized costs | 7,756 cmg_CapitalizedDevelopment | 9,024 cmg_CapitalizedDevelopment | 10,038 cmg_CapitalizedDevelopment
Goodwill impairment charges | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Restricted cash asset | 19,889 us-gaap_RestrictedCashAndCashEquivalents | 23,810 us-gaap_RestrictedCashAndCashEquivalents |
Aggregate impairment loss recognized on disposition of assets | 0 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | 1,220 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | 0 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Advertising and marketing costs | 57,290 us-gaap_MarketingAndAdvertisingExpense | 44,389 us-gaap_MarketingAndAdvertisingExpense | 34,999 us-gaap_MarketingAndAdvertisingExpense
Maximum reasonably assured lease term | 20 years |  |
Percentage of cash and investments balances not federally backed or federally insured | 33.30%cmg_PercentageOfCashAndInvestmentsBalancesNotFederallyBackedOrFederallyInsured |  |
Number of financial institutions | 6 cmg_NumberOfFinancialInstitutions |  |
Number of service providers for credit card transactions | 4 cmg_NumberOfServiceProvidersForCreditCardTransactions |  |
Accrued Payroll And Benefits [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated insurance liability | 25,596 us-gaap_SelfInsuranceReserve / us-gaap_BalanceSheetLocationAxis = cmg_AccruedPayrollAndBenefitsMember | 24,819 us-gaap_SelfInsuranceReserve / us-gaap_BalanceSheetLocationAxis = cmg_AccruedPayrollAndBenefitsMember |
Accrued Liabilities [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated insurance liability | $ 8,359 us-gaap_SelfInsuranceReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember | $ 6,749 us-gaap_SelfInsuranceReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember |
Canada [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 7 us-gaap_NumberOfRestaurants / us-gaap_StatementGeographicalAxis = country_CA |  |
Number of service providers for credit card transactions | 1 cmg_NumberOfServiceProvidersForCreditCardTransactions / us-gaap_StatementGeographicalAxis = country_CA |  |
England [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 6 us-gaap_NumberOfRestaurants / us-gaap_StatementGeographicalAxis = country_GB |  |
Number of service providers for credit card transactions | 1 cmg_NumberOfServiceProvidersForCreditCardTransactions / us-gaap_StatementGeographicalAxis = country_GB |  |
France [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 3 us-gaap_NumberOfRestaurants / us-gaap_StatementGeographicalAxis = country_FR |  |
Germany [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 1 us-gaap_NumberOfRestaurants / us-gaap_StatementGeographicalAxis = country_DE |  |
United States [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 1,755 us-gaap_NumberOfRestaurants / us-gaap_StatementGeographicalAxis = country_US |  |
Number of service providers for credit card transactions | 1 cmg_NumberOfServiceProvidersForCreditCardTransactions / us-gaap_StatementGeographicalAxis = country_US |  |
France and Germany [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of service providers for credit card transactions | 1 cmg_NumberOfServiceProvidersForCreditCardTransactions / us-gaap_StatementGeographicalAxis = cmg_CountryFranceAndGermanyMember |  |
ShopHouse Southeast Asian Kitchen [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 9 us-gaap_NumberOfRestaurants / us-gaap_ProductOrServiceAxis = cmg_ShophouseSoutheastAsianKitchenMember |  |
Pizzeria Locale [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 2 us-gaap_NumberOfRestaurants / us-gaap_ProductOrServiceAxis = cmg_PizzeriaLocaleMember |  |

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- Definition Percentage of cash and investments balances not federally backed or federally insured + References No definition available. + Details
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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The amount of breakage recognized related to unredeemed gift cards. Breakage occurs when a customer pays in advance of vendor performance and does not demand full performance for various reasons. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Breakage -URI http://asc.fasb.org/extlink&oid=6506468 + Details
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