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Losses And Loss Adjustment Expenses (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Insurance Loss Reserves [Abstract]        
Gross reserves at January 1 $ 1,038,984us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross $ 1,036,123us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross $ 985,279us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross  
Less reinsurance recoverable (14,484)mcy_ReissuanceRecoverable (13,927)mcy_ReissuanceRecoverable (12,155)mcy_ReissuanceRecoverable (7,921)mcy_ReissuanceRecoverable
Net reserves at January 1 1,025,057us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 1,023,968us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 977,358us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet  
Incurred losses and loss adjustment expense related to:        
Current year 1,989,315us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear 1,959,730us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear 1,919,116us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear  
Prior years (3,193)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears (2,960)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears (42,332)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears  
Total incurred losses and loss adjustment expenses 1,986,122us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims 1,962,690us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims 1,961,448us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims  
Loss and loss adjustment expense payments related to:        
Current year 1,347,967us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear 1,354,074us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear 1,314,748us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear  
Prior years 585,899us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears 607,527us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears 600,090us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears  
Total payments 1,933,866us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid 1,961,601us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid 1,914,838us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid  
Net reserves at year-end 1,077,313us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 1,025,057us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 1,023,968us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet  
Reinsurance recoverable 14,484mcy_ReissuanceRecoverable 13,927mcy_ReissuanceRecoverable 12,155mcy_ReissuanceRecoverable 7,921mcy_ReissuanceRecoverable
Gross reserves at year-end $ 1,091,797us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross $ 1,038,984us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross $ 1,036,123us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross