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Stock-based Compensation Plans - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 shares
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions	1

X

- Definition

Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: