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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%

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- 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

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