COMMITMENTS AND CONTINGENCIES (Details) (Self Insurance, USD $)	12 Months Ended
Dec. 31, 2014
Self Insurance
COMMITMENTS AND CONTINGENCIES
Retains of liability for individual health	$ 250,000,000
Maximum annual liability per insured	250,000
Minimum Amount Of Claims For Computation Of Variable Portion Of Maximum Liability For Health Plan Per Insured Per Year	250,000
Variable portion of maximum annual liability per insured (as a percent)	10.00%
Maximum liability for workers' compensation under stop-loss agreement per claim	$ 500,000

Represents information related to the retained liability for health plan coverage per insured per year.

No definition available.

Name:	mcri_FixedPortionOfRetainsLiabilityForHealthPlanPerInsuredPerYear
Namespace Prefix:	mcri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents information related to the maximum liability for health plan coverage per insured per year.

No definition available.

Name:	mcri_MaximumLiabilityForHealthPlanPerInsuredPerYear
Namespace Prefix:	mcri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the maximum liability per claim for workers' compensation under the stop-loss agreement.

No definition available.

Name:	mcri_MaximumLiabilityForWorkersCompensationPerClaim
Namespace Prefix:	mcri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

minimum number for incremental calculation of liability for claims

No definition available.

Name:	mcri_MinimumAmountOfClaimsForComputationOfVariablePortionOfMaximumLiabilityForHealthPlanPerInsuredPerYear
Namespace Prefix:	mcri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents information related to the percentage of the variable portion of maximum liability for health plan coverage per insured per year.

No definition available.

Name:	mcri_PercentageOfVariablePortionOfMaximumLiabilityForHealthPlanPerInsuredPerYear
Namespace Prefix:	mcri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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