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Intangible and other assets, net (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Internet Domain Names (Textual) [Abstract] |  |  |  |
Cost incurred to renew or extend term for domain names | $ 91,000 |  | $ 2,300,000 |
Amortization expense for internet domains | 76,000 | 274,000 | 443,000 | 886,000
Estimated amortization expense based on current amount of domains, remainder of 2012 | 102,000 |  | 102,000 |
Estimated amortization expense based on current amount of domains, 2013 | 221,000 |  | 221,000 |
Estimated amortization expense based on current amount of domains, 2014 | $ 40,000 |  | $ 40,000 |
Weighted average renewal period for registration fees |  |  | 1 year |

X
- Definition The aggregate expense charged against earnings to allocate the cost of internet domain names 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. + References No definition available. + Details
Name: | mchx_AmortizationOfDomainNames
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cost incurred to renew or extend term for domain names. + References No definition available. + Details
Name: | mchx_CostIncurredToRenewOrExtendTermForDomainNames
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year ended for internet domain names. + References No definition available. + Details
Name: | mchx_DomainNamesAmortizationExpenseReminderOfFiscalYear
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year ended for internet domain names. + References No definition available. + Details
Name: | mchx_DomainNamesAmortizationExpensesYearTwo
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year ended for internet domain names. + References No definition available. + Details
Name: | mchx_DomainNamesAmortizationExpenseYearThree
Namespace Prefix: | mchx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Weighted average renewal period for registration fees. + References No definition available. + Details
Name: | mchx_WeightedAverageRenewalPeriodForRegistrationFees
Namespace Prefix: | mchx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration