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Segment Reporting and Geographic Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue by geographic region
Revenue by geographic region	100.00%	100.00%	100.00%	100.00%
United States [Member]
Revenue by geographic region
Revenue by geographic region	93.00%	95.00%	94.00%	94.00%
Canada [Member]
Revenue by geographic region
Revenue by geographic region	7.00%	5.00%	6.00%	5.00%
Other countries [Member] | Maximum [Member]
Revenue by geographic region
Revenue by geographic region	1.00%	1.00%	1.00%	1.00%

X

- Definition

Revenue by geographic region.

+ References

No definition available.

+ Details

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

X

- Details

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