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Subsequent Event (Details) (Workmen's Auto Insurance Company [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jan. 12, 2015
Jan. 02, 2015
Subsequent Event [Line Items]        
Statutory surplus amount $ 7.8mcy_StatutoryAccountingPracticesStatutoryCapitalSurplusAmount      
Net premiums earned 22.4mcy_StatutoryAccountingPracticesNetPremiumsEarned 34.3mcy_StatutoryAccountingPracticesNetPremiumsEarned    
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Consideration paid in cash       8us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mcy_WorkmensAutoInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Amount held in escrow       2mcy_BusinessCombinationConsiderationTransferredAmountHeldInEscrow
/ us-gaap_BusinessAcquisitionAxis
= mcy_WorkmensAutoInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Term for escrow security payment       2 years
Capital contribution amount     $ 15us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mcy_WorkmensAutoInsuranceCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember