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Intangible and Other Assets Net - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Intangible Assets by Major Class [Line Items] |  |  |  |
Cost incurred to renew or extend term for domain names | $ 583,000 |  | $ 1,800,000 |
Weighted average renewal period for registration fees |  |  | 1 year |
Amortization expense for internet domains | 80,000 | 76,000 | 224,000 | 443,000
Estimated amortization expense based on current amount of domains, 2013 | 135,000 |  | 135,000 |
Estimated amortization expense based on current amount of domains, 2014 | 85,000 |  | 85,000 |
Estimated amortization expense based on current amount of domains, thereafter | $ 0 |  | $ 0 |

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 after the third rolling twelve months following the latest fiscal year ended for internet domain names. + References No definition available. + Details
Name: | mchx_DomainNamesAmortizationExpenseAfterYearThree
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 next fiscal year following the latest fiscal year for internet domain names. + References No definition available. + Details
Name: | mchx_DomainNamesAmortizationExpenseNextTwelveMonths
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
- Details
Name: | mchx_IntangibleAssetsByMajorClassLineItems
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