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Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Cash Flow) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net cash used in operating activities	$ 246,535us-gaap_NetCashProvidedByUsedInOperatingActivities	$ 209,804us-gaap_NetCashProvidedByUsedInOperatingActivities	$ 148,062us-gaap_NetCashProvidedByUsedInOperatingActivities
Equity securities:
Purchases	(542,494)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt	(831,796)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt	(590,562)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Sales	745,058us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	872,997us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	277,272us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
(Decrease) increase in payable for securities, net	9,294us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	1,702us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	1,919us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet
Other, net	3,472us-gaap_PaymentsForProceedsFromOtherInvestingActivities	1,741us-gaap_PaymentsForProceedsFromOtherInvestingActivities	2,255us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities	(194,035)us-gaap_NetCashProvidedByUsedInInvestingActivities	(18,351)us-gaap_NetCashProvidedByUsedInInvestingActivities	(69,745)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:
Dividends paid to shareholders	(135,496)us-gaap_PaymentsOfDividendsCommonStock	(134,776)us-gaap_PaymentsOfDividendsCommonStock	(134,105)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefit from exercise of stock options	148us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	202us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	86us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from stock options exercised	6,247us-gaap_ProceedsFromStockOptionsExercised	1,446us-gaap_ProceedsFromStockOptionsExercised	2,492us-gaap_ProceedsFromStockOptionsExercised
Proceeds from bank loan	100,000us-gaap_ProceedsFromBankDebt	50,000us-gaap_ProceedsFromBankDebt	0us-gaap_ProceedsFromBankDebt
Net cash used in financing activities	(29,101)us-gaap_NetCashProvidedByUsedInFinancingActivities	(83,128)us-gaap_NetCashProvidedByUsedInFinancingActivities	(131,527)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash	23,399us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	108,325us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(53,210)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash:
Beginning of year	266,508us-gaap_Cash	158,183us-gaap_Cash	211,393us-gaap_Cash
End of year	289,907us-gaap_Cash	266,508us-gaap_Cash	158,183us-gaap_Cash
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	2,543us-gaap_InterestPaid	998us-gaap_InterestPaid	1,690us-gaap_InterestPaid
Income taxes paid (received)	61,139us-gaap_IncomeTaxesPaid	16,503us-gaap_IncomeTaxesPaid	18,481us-gaap_IncomeTaxesPaid
Parent Company [Member]
Cash flows from operating activities:
Net cash used in operating activities	(3,434)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(843)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(5,590)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities:
Capital contribution to controlled entities	(30,125)mcy_PaymentsforContributionstoSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(40,125)mcy_PaymentsforContributionstoSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(125)mcy_PaymentsforContributionstoSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends from subsidiaries	231,756us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	120,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	145,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity securities:
Purchases	(254,572)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(25,038)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(14,102)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales	90,422us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	25,798us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	7,308us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Decrease) increase in payable for securities, net	(2,489)us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,489us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net decrease (increase) in short-term investments	(1,346)us-gaap_ProceedsFromSaleOfShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(36,085)us-gaap_ProceedsFromSaleOfShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(20,413)us-gaap_ProceedsFromSaleOfShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other, net	2,191us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	895us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	429us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in investing activities	38,529us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	120,104us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	118,097us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities:
Dividends paid to shareholders	(135,496)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(134,776)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(134,105)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefit from exercise of stock options	148us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	202us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	86us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from stock options exercised	6,247us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,446us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,492us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from bank loan	100,000us-gaap_ProceedsFromBankDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	50,000us-gaap_ProceedsFromBankDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_ProceedsFromBankDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in financing activities	(29,101)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(83,128)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(131,527)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash	5,994us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	36,133us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(19,020)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash:
Beginning of year	46,332us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	10,199us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	29,219us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
End of year	52,326us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	46,332us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	10,199us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	1,757us-gaap_InterestPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	318us-gaap_InterestPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_InterestPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes paid (received)	$ 2,112us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ (827)us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 4,667us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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