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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Maximum period from approval during which number of conditions must be met	6 months
Land improvements | Minimum
Property and Equipment
Estimated useful lives	15 years
Land improvements | Maximum
Property and Equipment
Estimated useful lives	40 years
Buildings | Minimum
Property and Equipment
Estimated useful lives	30 years
Buildings | Maximum
Property and Equipment
Estimated useful lives	40 years
Building improvements | Minimum
Property and Equipment
Estimated useful lives	15 years
Building improvements | Maximum
Property and Equipment
Estimated useful lives	40 years
Furniture | Minimum
Property and Equipment
Estimated useful lives	5 years
Furniture | Maximum
Property and Equipment
Estimated useful lives	10 years
Equipment | Minimum
Property and Equipment
Estimated useful lives	3 years
Equipment | Maximum
Property and Equipment
Estimated useful lives	20 years

X

- Definition

Represents the maximum period from approval during which a number of conditions must be met before the license can be issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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