XML 68 R36.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Notes Payable (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Notes Payable [Abstract] |
Fair Value Of Notes Payable |
|  | December 31, |
|  | 2011 |  |  | 2010 |
|  | (Amounts in thousands) |
Unsecured notes |  | $ | 0 |  |  | $ | 129,210 |
Secured notes |  |  | 140,000 |  |  |  | 138,000 |
Total |  | $ | 140,000 |  |  | $ | 267,210 |

X
- Definition Notes Payable [Table Text Block] + References No definition available. + Details
Name: | mcy_NotesPayableTableTextBlock
Namespace Prefix: | mcy_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_NotesPayableAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration