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Document And Entity Information (USD $)
 12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Mar. 07, 2012
Class A Common Stock [Member]
Mar. 07, 2012
Class B Common Stock [Member]
Document Type 10-K      
Amendment Flag false      
Document Period End Date Dec. 31, 2011      
Document Fiscal Year Focus 2011      
Document Fiscal Period Focus FY      
Entity Registrant Name MARCHEX INC      
Entity Central Index Key 0001224133      
Current Fiscal Year End Date --12-31      
Entity Filer Category Accelerated Filer      
Entity Common Stock, Shares Outstanding     9,570,382 27,594,701
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Well-known Seasoned Issuer No      
Entity Public Float   $ 183,870,541