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Segment Reporting and Geographic Information (Details Textual)	9 Months Ended
	Sep. 30, 2012
Segment reporting and geographic information (Textual) [Abstract]
Percentage of revenue in other countries	1.00%

X

- Definition

The percentage of total revenue derived from sales to customers in countries other than the ones listed herein.

+ References

No definition available.

+ Details

Name:	mchx_PercentageOfRevenuesInOtherCountriesMaximum
Namespace Prefix:	mchx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	mchx_SegmentReportingAndGeographicInformationTextualAbstract
Namespace Prefix:	mchx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration