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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Amortized cost on fixed maturities trading investments $ 2,772,702mcy_AmortizedCostOnFixedMaturityTradingInvestments $ 2,503,494mcy_AmortizedCostOnFixedMaturityTradingInvestments
Cost - equity security trading investments 362,124mcy_CostEquitySecurityTradingInvestments 387,851mcy_CostEquitySecurityTradingInvestments
Cost - short-term investments $ 174,040mcy_CostShortTermInvestments $ 373,180mcy_CostShortTermInvestments
Common Stock    
Common stock, no par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized 70,000,000us-gaap_CommonStockSharesAuthorized 70,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 55,147,000us-gaap_CommonStockSharesIssued 55,121,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 55,147,000us-gaap_CommonStockSharesOutstanding 55,121,000us-gaap_CommonStockSharesOutstanding