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Concentrations (Details Textual)	9 Months Ended
	Sep. 30, 2012 Institution
Concentrations (Textual) [Abstract]
Concentration Risk, Percentage	10.00%
Number of financial institution	1
Percentage of revenue as criteria for major distribution partners	10.00%
Accounts receivable major customer percentage	10.00%

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- Details

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Namespace Prefix:	mchx_
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- Definition

Entity wide accounts receivable major customer percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
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- Definition

The number of financial institutions.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
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- Definition

Percentage of revenue as criteria for major advertisers.

+ References

No definition available.

+ Details

Name:	mchx_PercentageOfRevenueAsCriteriaForMajorAdvertisers
Namespace Prefix:	mchx_
Data Type:	num:percentItemType
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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
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