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Commitments, Contingencies, and Taxes - Additional Information (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Nov. 30, 2018
Commitments Contingencies And Taxes [Line Items]
Long term commitment amount	$ 12,670,000
Percentage of valuation allowance	100.00%	100.00%
Strategic Technology
Commitments Contingencies And Taxes [Line Items]
Long term commitment amount	$ 2,500,000
Telmetrics Acquisition
Commitments Contingencies And Taxes [Line Items]
Maximum contingent consideration cash payable on acquisition			$ 3,000,000
Fair value of contingent consideration	$ 1,600,000		$ 1,600,000

X

- Definition

Commitments, contingencies and taxes.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
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- Definition

Deferred tax assets, valuation allowance, percentage.

+ References

No definition available.

+ Details

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X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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X

- Definition

Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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- Details

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