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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 6) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Promotional Allowances |  |  |
Estimated departmental costs of providing promotional allowances | $ 41,808,000 us-gaap_PromotionalAllowances | $ 43,168,000 us-gaap_PromotionalAllowances | $ 40,689,000 us-gaap_PromotionalAllowances
Advertising Costs |  |  |
Advertising expense | 5,200,000 us-gaap_AdvertisingExpense | 5,200,000 us-gaap_AdvertisingExpense | 4,700,000 us-gaap_AdvertisingExpense
Gaming Taxes |  |  |
Total gaming taxes | 16,000,000 mcri_GamingTaxes | 16,100,000 mcri_GamingTaxes | 12,200,000 mcri_GamingTaxes
Food and beverage |  |  |
Promotional Allowances |  |  |
Estimated departmental costs of providing promotional allowances | 22,855,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_FoodAndBeverageExpensesMember | 21,713,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_FoodAndBeverageExpensesMember | 20,464,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_FoodAndBeverageExpensesMember
Hotel |  |  |
Promotional Allowances |  |  |
Estimated departmental costs of providing promotional allowances | 2,893,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_HotelExpensesMember | 2,622,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_HotelExpensesMember | 2,850,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_HotelExpensesMember
Other |  |  |
Promotional Allowances |  |  |
Estimated departmental costs of providing promotional allowances | 1,732,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | 1,777,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | 1,857,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember
Promotional allowances |  |  |
Promotional Allowances |  |  |
Estimated departmental costs of providing promotional allowances | $ 27,480,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_PromotionalAllowancesMember | $ 26,112,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_PromotionalAllowancesMember | $ 25,171,000 us-gaap_PromotionalAllowances / us-gaap_IncomeStatementLocationAxis = mcri_PromotionalAllowancesMember

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- Definition Represents the total amount of gaming taxes. + References No definition available. + Details
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Namespace Prefix: | mcri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | mcri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | mcri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6472957&loc=d3e51325-107943 + Details
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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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