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Acquisition - Summary of Acquisition (Details) (Workmen's Auto Insurance Company [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended		3 Months Ended
	Jan. 02, 2015	Jan. 01, 2015	Mar. 31, 2015	Jan. 02, 2015	Jan. 01, 2015
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash		$ 8,000us-gaap_PaymentsToAcquireBusinessesGross
Less: Amount held in escrow	2,000mcy_BusinessCombinationConsiderationTransferredAmountHeldInEscrow	2,000mcy_BusinessCombinationConsiderationTransferredAmountHeldInEscrow
Fair value of total consideration transferred	8,000us-gaap_BusinessCombinationConsiderationTransferred1	6,000us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Acquisition-related costs		231us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts			231us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Total assets	31,078us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets			31,078us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
Total liabilities	(26,478)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities			(26,478)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Total identifiable net assets	4,600mcy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillandLiabilitiesAssumedExcludingIntangibleAssetsArisingFromBusinessCombination			4,600mcy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillandLiabilitiesAssumedExcludingIntangibleAssetsArisingFromBusinessCombination
Total	6,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet			6,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Business Acquisition, Pro Forma Information [Abstract]
Revenue			6,863us-gaap_BusinessAcquisitionsProFormaRevenue
Net loss			(2,014)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Intangible asset - state insurance license	$ 1,400us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombination / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationMember			$ 1,400us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombination / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationMember

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- Definition

Business Combination, Consideration Transferred, Amount Held In Escrow

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Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Excluding Intangible Assets Arising From Business Combination

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The amount of financial assets (as defined) recognized as of the acquisition date.

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-Glossary Financial Asset

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Carrying amount as of the balance sheet date of the intangible assets from insurance contracts acquired in a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Glossary Investing Activities

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