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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Aug. 23, 2012	Mar. 31, 2015	Mar. 31, 2014	Oct. 22, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Multiplier of period for which approval is extended	3mcri_ApprovalExtensionPeriodMultiplier
Additional period for which the approval was extended	6 months
Net Revenues		$ 47,171us-gaap_RevenueFromLeasedAndOwnedHotels	$ 45,508us-gaap_RevenueFromLeasedAndOwnedHotels
Operating Expenses		$ 40,700us-gaap_CostsAndExpenses	$ 40,177us-gaap_CostsAndExpenses
Authorized repurchase of Company's common stock				3,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Treasury Stock, Number of Shares Held		0us-gaap_TreasuryStockNumberOfSharesHeld

X

- Definition

Represents the additional period for which the approval was extended.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcri_
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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the multiplier of period for which approval is extended.

+ References

No definition available.

+ Details

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Namespace Prefix:	mcri_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total costs of sales and operating expenses for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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X

- Definition

Amount, net of promotional allowances, of revenue from managing and operating hotels, including, but not limited to, revenue from occupancy, casino, food and beverage, and retail. Excludes operating lease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Number of shares held for each class of treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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