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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Apr. 26, 2012
Intangible assets |  |  |
Amount of goodwill recorded | $ 25,111,000 us-gaap_Goodwill | $ 25,111,000 us-gaap_Goodwill |
Monarch Black Hawk |  |  |
Intangible assets |  |  |
Amount of goodwill recorded | 25,100,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  | 25,110,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember
Total Intangible assets | 12,080,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 12,080,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Total accumulated amortization | (4,714,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | (3,549,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Total | 7,366,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 8,531,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Weighted-average life | 6 years 3 months 18 days | 7 years 3 months 18 days |
Amortization expense | 1,200,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 1,700,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Fair value inputs |  |  |
Decrease in goodwill upon completion of the purchase price allocation related primarily to modification to the value of certain deferred tax assets | 1,400,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |
Changes to carrying amount of goodwill | 0 us-gaap_GoodwillOtherChanges / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 0 us-gaap_GoodwillOtherChanges / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Customer list | Monarch Black Hawk |  |  |
Intangible assets |  |  |
Total Intangible assets | 10,490,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 10,490,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |
Total accumulated amortization | (3,124,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | (1,959,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |
Useful life of finite-lived intangible assets |  |  | 9 years
Fair value inputs |  |  |
Attrition rate (as a percent) | 24.00%mcri_FairValueInputsAttritionRate / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |
Risk-adjusted discount rate (as a percent) | 12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |
Trade Name | Monarch Black Hawk |  |  |
Intangible assets |  |  |
Total Intangible assets | 1,590,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 1,590,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Total accumulated amortization | $ (1,590,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | $ (1,590,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Fair value inputs |  |  |
Royalty rate (as a percent) | 1.00%mcri_FairValueInputsRoyaltyRate / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |
Risk-adjusted discount rate (as a percent) | 11.00%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |

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