Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of amortization of intangible assets from acquisitions:
Service costs	$ 4,515	$ 2,729	$ 5,448
Sales and marketing	897
General and administrative	43		45
Total	$ 5,455	$ 2,729	$ 5,493

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

No definition available.

Name:	mchx_AmortizationOfIntangibleAssetsFromAcquisitionsGeneralAndAdministrative
Namespace Prefix:	mchx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration