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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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration