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Credit Agreement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 | Apr. 30, 2008
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Debt And Credit Agreements [Line Items] |  |  |
Secured revolving credit facility |  |  | $ 30
Maturity period | Through April 1, 2014 |  |
Borrowings under the credit agreement | $ 0 | $ 0 |

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- Details
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Namespace Prefix: | mchx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility expiration date description. + References No definition available. + Details
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Namespace Prefix: | mchx_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant