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v3.20.1

Subsequent Event (Details) - Subsequent Event [Member] - USD ($) $ in Thousands | Apr. 13, 2020 | Apr. 09, 2020
--- | --- | ---
Subsequent Event [Line Items] |  |
Refund liability, percentage |  | 15.00%
Refund liability |  | $ 70,000
Term of refund liability | 120 days |

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- Definition COVID-19 Response, Contract with Customer, Liability + References No definition available. + Details
Name: | mcy_COVID19ResponseContractwithCustomerLiability
Namespace Prefix: | mcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition COVID-19 Response, Contract with Customer, Refund Liability, Percentage + References No definition available. + Details
Name: | mcy_COVID19ResponseContractwithCustomerRefundLiabilityPercentage
Namespace Prefix: | mcy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition COVID-19 Response, Contract with Customer, Refund Liability, Term + References No definition available. + Details
Name: | mcy_COVID19ResponseContractwithCustomerRefundLiabilityTerm
Namespace Prefix: | mcy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |