XML 31 R87.htm IDEA: XBRL DOCUMENT v2.4.0.6

Subsequent Events (Details) (Subsequent Event [Member], Employee Severance [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jan. 31, 2013 employee	Mar. 31, 2013 Minimum [Member] Scenario, Forecast [Member]	Mar. 31, 2013 Maximum [Member] Scenario, Forecast [Member]
Subsequent Event [Line Items]
Workforce reduction, number of employees	135
Workforce reduction, number of employees eliminated as a percentage of total workforce (less than 3% as of January, 2013)	3.00%
Workforce reduction, expected office closure costs and severance related expense		$ 8	$ 13

X

- Definition

Restructuring and Related Costs, Number of Positions Eliminated, Percentage of Total Workforce

+ References

No definition available.

+ Details

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Namespace Prefix:	mcy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB Topic 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 146

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 95-3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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