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Concentrations - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Concentration Risk [Line Items]
Percentage of revenue as criteria for major distribution partners	20.00%	20.00%

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