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Intangible and Other Assets Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Intangible Assets Disclosure [Line Items]
Internet domain names	$ 14,598	$ 14,514
Less accumulated amortization	(14,414)	(14,376)
Internet domain names, net	184	138
Registration fees, net	4	12
Other	1,252	334
Total intangibles and other assets, net	$ 1,440	$ 484

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- Definition

Domain names assets accumulated amortization.

+ References

No definition available.

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- Definition

Amount before amortization of domain assets with a finite life.

+ References

No definition available.

+ Details

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

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- Definition

Amount after amortization of domain assets with a finite life.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Registration fees net.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
Data Type:	xbrli:monetaryItemType
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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ 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 210.5-02.17)

-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 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 7

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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ 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 210.5-02.17)

-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 17

-Article 5

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