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Basis of Presentation (Narrative) (Details)	9 Months Ended
	Sep. 30, 2013 segment item region
Number of restaurants	1,539
Number of regions	7
Number of reportable segments	1
ShopHouse Southeast Asian Kitchen [Member]
Number of restaurants	3
Canada [Member]
Number of restaurants	6
England [Member]
Number of restaurants	6
France [Member]
Number of restaurants	1
Germany [Member]
Number of restaurants	1

X

- Definition

The number of regions by which the Company manages its operations.

+ References

No definition available.

+ Details

Name:	cmg_NumberOfRegionsInWhichEntityOperates
Namespace Prefix:	cmg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of restaurants.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRestaurants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant