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Income Taxes (Details) | 6 Months Ended
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Jun. 30, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |
Recognition of tax benefits threshold, likeliness of realization | 50.00%

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- Definition Percentage of Largest Amount of Tax Benefit Realized + References No definition available. + Details
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Namespace Prefix: | mcy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration