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RIVIERA BLACK HAWK ACQUISITION TRANSACTION (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |
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Apr. 26, 2012 | 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 | Sep. 29, 2011
RIVIERA BLACK HAWK ACQUISITION TRANSACTION |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed under acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 77,760,000 us-gaap_ProceedsFromLinesOfCredit |
Consideration |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | 75,885,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed by the Company | 3,505,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment. | 604,000 mcri_Businesscombinationprovisionalinformationinitialaccountingincompleteadjustmentworkingcapital |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | 79,994,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Acquisition cost |  |  |  |  |  |  |  |  |  |  |  | 2,156,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Net revenue and operating income included in the entity's consolidated income statement |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  | 45,859,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 48,597,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 47,803,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 45,508,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 44,504,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 48,989,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 49,651,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 45,605,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 187,767,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 188,749,000 us-gaap_RevenueFromLeasedAndOwnedHotels | 163,302,000 us-gaap_RevenueFromLeasedAndOwnedHotels |
Income from operations |  | 4,754,000 us-gaap_OperatingIncomeLoss | 6,666,000 us-gaap_OperatingIncomeLoss | 5,468,000 us-gaap_OperatingIncomeLoss | 5,331,000 us-gaap_OperatingIncomeLoss | 4,163,000 us-gaap_OperatingIncomeLoss | 8,939,000 us-gaap_OperatingIncomeLoss | 10,168,000 us-gaap_OperatingIncomeLoss | 7,185,000 us-gaap_OperatingIncomeLoss | 22,219,000 us-gaap_OperatingIncomeLoss | 30,455,000 us-gaap_OperatingIncomeLoss | 15,983,000 us-gaap_OperatingIncomeLoss |
Monarch Black Hawk |  |  |  |  |  |  |  |  |  |  |  |  |
RIVIERA BLACK HAWK ACQUISITION TRANSACTION |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition deposit |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 us-gaap_OtherPaymentsToAcquireBusinesses / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  | 76,000,000 mcri_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceExcludingDepositPayment / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember
Payment of purchase price, net of deposit | 72,200,000 mcri_PaymentOfPurchasePriceNetOfDeposit / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Net working capital available after payment of indebtedness | 2,100,000 mcri_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsNetWorkingCapital / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Amount of purchase price escrowed to secure Seller's indemnification obligations | 2,280,000 us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Period for which purchase price is escrowed | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 6,241,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Total tangible assets | 35,908,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of goodwill recorded | 25,110,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 25,100,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  | 25,100,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |
Total intangible assets | 37,190,000 mcri_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset | 6,896,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 79,994,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember | 2,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Net revenue and operating income included in the entity's consolidated income statement |  |  |  |  |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  |  |  |  | 29,678,000 us-gaap_RevenueFromLeasedAndOwnedHotels / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Income from operations |  |  |  |  |  |  |  |  |  |  |  | 6,350,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Pro forma (unaudited) consolidated results of operations |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  | 183,043,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Income from operations |  |  |  |  |  |  |  |  |  |  |  | 17,516,000 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Net income |  |  |  |  |  |  |  |  |  |  |  | 9,542,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.59 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.59 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember |
Monarch Black Hawk | Customer list |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total intangible assets | 10,490,000 mcri_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |  |  |  |  |  |  |  |  |  |
Monarch Black Hawk | Trade Name |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total intangible assets | 1,590,000 mcri_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |  |  |  |  |  |  |  |  |  |
Monarch Black Hawk | Land |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total tangible assets | 8,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |  |  |  |  |  |  |  |  |  |  |  |
Monarch Black Hawk | Land improvements |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total tangible assets | 30,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandImprovementsMember |  |  |  |  |  |  |  |  |  |  |  |
Monarch Black Hawk | Building improvement |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total tangible assets | 15,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingImprovementsMember |  |  |  |  |  |  |  |  |  |  |  |
Monarch Black Hawk | Furniture and equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total tangible assets | 5,737,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |  |  |  |  |  |  |  |  |  |  |  |
Monarch Black Hawk | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
RIVIERA BLACK HAWK ACQUISITION TRANSACTION |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed under acquisition | $ 72,300,000 us-gaap_ProceedsFromLinesOfCredit / us-gaap_BusinessAcquisitionAxis = mcri_RivieraBlackHawkIncMember / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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