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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.

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