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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