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Commitments and Contingencies (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended
	Dec. 08, 2014	Apr. 30, 2010 instance_of_noncompliance	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Deferred rent			$ 3,000,000us-gaap_DeferredRentCredit	$ 3,400,000us-gaap_DeferredRentCredit
Total rent expense			14,600,000us-gaap_OperatingLeasesRentExpenseNet	19,300,000us-gaap_OperatingLeasesRentExpenseNet	17,700,000us-gaap_OperatingLeasesRentExpenseNet
Exposure to earthquake loss			62,500,000us-gaap_LossFromCatastrophes
Number of instances of non-compliance issued from regulatory body		35mcy_NumberOfInstancesOfNonComplianceIssuedFromRegulatoryBody
Settlement of fine and penalty levied by California DOI	$ 27,593,550us-gaap_LitigationSettlementAmount

X

- Definition

Number of Instances of Non-Compliance Issued from Regulatory Body

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

+ Details

Name:	us-gaap_DeferredRentCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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