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Interest and Other - Additional Information (Detail) $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($)
Other Income And Expenses [Abstract]
Contractual settlement of upside payment received	$ 2.5

X

- Definition

Contractual settlement of an upside payment received.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration