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Intangible Assets from Acquisitions (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Original cost and accumulated amortization of fully amortized intangible assets	$ 84.7	$ 82.1

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- Definition

Original cost and accumulated amortization of fully amortized intangible assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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