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Revenues by Geographic Region (Detail)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information
Revenue by geographic region	100.00%		100.00%		100.00%		100.00%
United States
Segment Reporting Information
Revenue by geographic region	95.00%		93.00%		94.00%		94.00%
Canada
Segment Reporting Information
Revenue by geographic region	5.00%		7.00%		6.00%		6.00%
Other Countries
Segment Reporting Information
Revenue by geographic region		[1]		[1]		[1]		[1]
[1] Less than 1% of revenue.

X

- Definition

Revenue by geographic region.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration