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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basis of Presentation (Details)	Aug. 23, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of times that approval of interactive gaming license has been extended	3
Additional period for which the license was extended	6 months

X

- Definition

Represents the additional period for which the approval was extended.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the multiplier of period for which approval is extended.

+ References

No definition available.

+ Details

Name:	mcri_ApprovalExtensionPeriodMultiplier
Namespace Prefix:	mcri_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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