Income Taxes (Details)	3 Months Ended
Mar. 31, 2013
Income Taxes [Abstract]
Period for which no expected change in unrecognized tax benefit	12 months

Period for which entity expects that unrecognized tax benefits will remain unchanged.

No definition available.

Name:	mrge_PeriodForWhichNoExpectedChangeInUnrecognizedTaxBenefitIsAnticipated
Namespace Prefix:	mrge_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration