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Share-Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2008
Dec. 31, 2007
May 31, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross          
Number of shares granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod      
Intrinsic value of stock options exercised $ 1,160us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 862us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 392us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Total fair value of stock options vested 142mcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue 146mcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue 407mcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue      
2005 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock authorized for issuance           4,920,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= mcy_TwoThousandFivePlanMember
Percentage of stock option exercisable per year       25.00%mcy_PercentageOfStockOptionExercisablePerYear
/ us-gaap_PlanNameAxis
= mcy_TwoThousandFivePlanMember
20.00%mcy_PercentageOfStockOptionExercisablePerYear
/ us-gaap_PlanNameAxis
= mcy_TwoThousandFivePlanMember
 
Stock option expiration period (in years)       10 years    
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost $ 344us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Weighted-average period of recognition, in years 2 years 4 months 24 days          
Restricted Stock And Restricted Stock Unit [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Based Compensation Arrangement By Share-Based Payment Award, Non-option Equity Instruments, Forfeitures Due To Employee Termination 7,000mcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonoptionEquityInstrumentsForfeituresDueToEmployeeTermination
/ us-gaap_AwardTypeAxis
= mcy_RestrictedStockAndRestrictedStockUnitMember
4,000mcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonoptionEquityInstrumentsForfeituresDueToEmployeeTermination
/ us-gaap_AwardTypeAxis
= mcy_RestrictedStockAndRestrictedStockUnitMember
11,500mcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonoptionEquityInstrumentsForfeituresDueToEmployeeTermination
/ us-gaap_AwardTypeAxis
= mcy_RestrictedStockAndRestrictedStockUnitMember