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Long-Term Debt and Short-Term Borrowings - Capped Call Transactions (Details) | Sep. 17, 2020 $ / shares
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Debt Disclosure [Abstract] |
Cap price of capped call transactions (in dollars per share) | $ 17.98
Strike price of capped call transactions (in dollars per share) | $ 11.0128
Initial conversion premium | 100.00%
Share price (in dollars per share) | $ 8.99

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- Definition Represents the cap price of the capped call transactions. + References No definition available. + Details
Name: | mcs_CappedCallTransactionsCapPrice
Namespace Prefix: | mcs_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the strike price of the capped call transactions. + References No definition available. + Details
Name: | mcs_CappedCallTransactionsStrikePrice
Namespace Prefix: | mcs_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the initial conversion premium of as a percentage of last reported sale price of the Common Stock. + References No definition available. + Details
Name: | mcs_DebtInstrumentConvertibleConversionPremium
Namespace Prefix: | mcs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant