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Impact of COVID-19 Pandemic (Details) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 24, 2020 restaurant item | Jun. 30, 2020 restaurant item | Jun. 11, 2020 item | Apr. 30, 2020 restaurant | Mar. 24, 2020 restaurant
Impact of COVID-19 Pandemic |  |  |  |  |
Number of theatre opened | item |  | 6 |  |  |
Number of parking lot cinemas | item | 5 |  |  |  |
Number of hotels and resorts closed | restaurant | 4 |  |  | 5 | 80
Number of hotels and resorts owned | restaurant |  |  |  |  | 66
Number of hotels re-opened | restaurant |  | 8 |  |  |
Temporary reduction in salary of Company's chairman, president and chief executive officer (as a percent) | 50.00% |  |  |  |
Number of theatres proposed to re-open | item |  |  | 80 |  |

X
- Definition Number Of Hotels And Resorts Owned + References No definition available. + Details
Name: | mcs_NumberOfHotelsAndResortsOwned
Namespace Prefix: | mcs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of hotels and resorts re-opened by the company. + References No definition available. + Details
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Namespace Prefix: | mcs_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition Number of hotels and resorts temporarily closed by the company. + References No definition available. + Details
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Namespace Prefix: | mcs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of parking lot cinemas running by the company. + References No definition available. + Details
Name: | mcs_NumberOfParkingLotCinemas
Namespace Prefix: | mcs_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition Number of theatres bases opened on very limited bases by the company. + References No definition available. + Details
Name: | mcs_NumberOfTheatreOpened
Namespace Prefix: | mcs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of theatres proposed to re-open by the company. + References No definition available. + Details
Name: | mcs_NumberOfTheatresProposedToReOpen
Namespace Prefix: | mcs_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition Percentage of temporary reduction in the salary of the Company's chairman, president and chief executive officer. + References No definition available. + Details
Name: | mcs_TemporaryReductionInSalaryPercentage
Namespace Prefix: | mcs_
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Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LossContingencyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration