XML 27 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Income Taxes (Details) | 9 Months Ended
--- | ---
Sep. 30, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |
Recognition of tax benefits threshold, likeliness of realization | 50.00%

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

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