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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 01, 2014 | Jan. 01, 2014 | Jul. 31, 2014 | Apr. 26, 2012
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of goodwill recorded | $ 25,111,000 us-gaap_Goodwill |  |  |  | $ 25,111,000 us-gaap_Goodwill |  |  |  | $ 25,111,000 us-gaap_Goodwill | $ 25,111,000 us-gaap_Goodwill |  |  |  |  |
Net book value | 180,271,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 175,637,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 180,271,000 us-gaap_PropertyPlantAndEquipmentNet | 175,637,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic | 3,811,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 4,074,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,024,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,276,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 2,059,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 5,520,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 6,120,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 4,262,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 14,185,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 17,961,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 8,911,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |
Monarch Black Hawk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of goodwill recorded | 25,100,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  | 25,100,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  | 25,110,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember
Monarch Black Hawk Parking Structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  | 4,800,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  |  | 4,800,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  | 2,900,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |
Estimated depreciable life |  |  |  |  |  |  |  |  |  | P37Y |  | P18M | P15M |  |
Depreciation, Per Month |  |  |  |  |  |  |  |  |  | 300,000 mcri_DepreciationPerMonth / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  | 200,000 mcri_DepreciationPerMonth / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |
Depreciation, Net of Tax, Per Month |  |  |  |  |  |  |  |  |  | 200,000 mcri_DepreciationNetOfTaxPerMonth / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  | 100,000 mcri_DepreciationNetOfTaxPerMonth / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |
Depreciation |  |  |  |  |  |  |  |  | 2,900,000 us-gaap_Depreciation / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  | $ 1,900,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  |  |  |
Basic and diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.11 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_BusinessAcquisitionAxis = mcri_MonarchBlackHawkParkingStructureMember |  |  |  |  |  |

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