GUARANTEES AND COLLATERAL (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Liabilities Indemnification Agreements Payables	$ 1.5

The sum of payables that could be required to be made under the terms of an indemnification agreement for the specified period.

No definition available.

Name:	mmab_LiabilitiesIndemnificationAgreementsPayables
Namespace Prefix:	mmab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration