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Leases (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013
Operating Leased Assets [Line Items] |  |
Option terms of lease | 5 years |
Minimum sublease rentals | $ 6,610 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals |
Number of sale leaseback transactions | 6 cmg_NumberOfSaleLeasebackTransactions |
Total deemed landlord financing | $ 3,233 us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions | $ 3,386 us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions
Shopping Center Or Building Leases [Member] | Minimum [Member] |  |
Operating Leased Assets [Line Items] |  |
Combined initial and option terms lease | 20 years |
Shopping Center Or Building Leases [Member] | Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Combined initial and option terms lease | 25 years |
Ground Leases [Member] | Minimum [Member] |  |
Operating Leased Assets [Line Items] |  |
Combined initial and option terms lease | 30 years |
Ground Leases [Member] | Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Combined initial and option terms lease | 40 years |

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- Definition Number of sale leaseback transactions + References No definition available. + Details
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Namespace Prefix: | cmg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Option terms of lease + References No definition available. + Details
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Namespace Prefix: | cmg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Combined initial and option terms of lease + References No definition available. + Details
Name: | cmg_TermOfLease
Namespace Prefix: | cmg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Present value of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |