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v2.4.0.8

Concentrations - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 Customer | Sep. 30, 2012 Customer | Sep. 30, 2013 Customer | Sep. 30, 2012 Customer
Concentration Risk [Line Items] |  |  |  |
Percentage of revenue as criteria for major distribution partners | 15.00% | 10.00% | 15.00% | 10.00%
Number of distribution partners that were paid consolidated revenue | 1 | 0 | 1 | 0

X
- Definition Number of distribution partners. + References No definition available. + Details
Name: | mchx_NumberOfMajorDistributionPartners
Namespace Prefix: | mchx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of revenue as criteria for major distribution partners. + References No definition available. + Details
Name: | mchx_PercentageOfRevenueAsCriteriaForMajorDistributionPartners
Namespace Prefix: | mchx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration