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Restaurant Closure Costs and Impairment of Long-Lived Assets (Schedule of Impairment Charges) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restaurant Closure Costs and Impairment of Long-Lived Assets [Abstract] |  |  |
Lease termination and other restaurant closure costs | $ 40,522 | $ 3,284 | $ 17,394

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- Definition Asset Impairment Charges Disclosure [Abstract] + References No definition available. + Details
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Namespace Prefix: | cmg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Termination of Lease, Charges and Related Costs + References No definition available. + Details
Name: | cmg_TerminationOfLeaseChargesAndRelatedCosts
Namespace Prefix: | cmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration