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Acquisition - Narrative (Details) (Workmen's Auto Insurance Company [Member], USD $)	0 Months Ended
	Jan. 12, 2015	Jan. 02, 2015	Jan. 01, 2015
Workmen's Auto Insurance Company [Member]
Business Acquisition [Line Items]
Fair value of total consideration transferred		$ 8,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember	$ 6,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember
Less: Amount held in escrow		2,000,000mcy_BusinessCombinationConsiderationTransferredAmountHeldInEscrow / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember	2,000,000mcy_BusinessCombinationConsiderationTransferredAmountHeldInEscrow / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember
Maximum duration for escrow security		3 years
Capital contribution to WAIC	$ 15,000,000mcy_RegulatoryCapitalContributionToAcquiree / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember

X

- Definition

Business Combination, Consideration Transferred, Amount Held In Escrow

+ References

No definition available.

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- Definition

Business Combination, Consideration Transferred, Amount Held In Escrow, Term

+ References

No definition available.

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- Definition

Regulatory Capital Contribution To Acquiree

+ References

No definition available.

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- Details

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

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