XML 94 R79.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Profit Sharing Plan and Annual Cash Bonuses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred Compensation Arrangements [Abstract] |  |  |
Maximum percentage of compensation employee is allowed to contribute | 15.00% |  |
Matching contributions | $ 8.5 | $ 8.0 | $ 8.1
Bonus expense, cash | $ 20.7 | $ 19.1 | $ 0.0

X
- Definition Individual Employees, Bonus Expense, Cash + References No definition available. + Details
Name: | mcy_IndividualEmployeesBonusExpenseCash
Namespace Prefix: | mcy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of compensation employee is allowed to contribute to the Plan. + References No definition available. + Details
Name: | mcy_MaximumPercentageOfCompensationEmployeeIsAllowedToContribute
Namespace Prefix: | mcy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration