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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Amortized cost on fixed maturities trading investments $ 2,523,042mcy_AmortizedCostOnFixedMaturityTradingInvestments $ 2,270,903mcy_AmortizedCostOnFixedMaturityTradingInvestments
Cost - equity security trading investments 223,933mcy_CostEquitySecurityTradingInvestments 475,959mcy_CostEquitySecurityTradingInvestments
Cost - short-term investments $ 315,886mcy_CostShortTermInvestments $ 294,607mcy_CostShortTermInvestments
Common Stock    
Common stock, no par value (in dollars per share) $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized (in shares) 70,000,000us-gaap_CommonStockSharesAuthorized 70,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 55,121,000us-gaap_CommonStockSharesIssued 54,975,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 55,121,000us-gaap_CommonStockSharesOutstanding 54,975,000us-gaap_CommonStockSharesOutstanding