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BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
BENEFIT PLANS
Maximum percentage of pre-tax compensation that participating employees may defer under the plan	100.00%
Company's matching contributions	$ 318	$ 283	$ 283

X

- Definition

Represents the maximum percentage of pre-tax compensation that participating employees may defer under the defined contribution plan.

+ References

No definition available.

+ Details

Name:	mcri_DefinedContributionPlanMaximumPercentageOfPreTaxCompensationThatParticipatingEmployeesMayDefer
Namespace Prefix:	mcri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration