Number of persons from management with an ownership interest in the related party entity

No definition available.

Name:	mtz_NumberOfManagementMembers
Namespace Prefix:	mtz_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount for accounts payable to related parties.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Balance Type:	debit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=mtz_SubcontractingArrangementsMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_BoardOfDirectorsChairmanMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=us-gaap_LeaseAgreementsMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=mtz_RelatedCustomerMember
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Data Type:	na
Balance Type:
Period Type:

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Balance Type:
Period Type:

Related Party Transactions - Executive Officers - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) employee	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Management \| Subcontracting Arrangements
Related Party Transaction [Line Items]
Number of management members, subcontracting arrangement \| employee	2
Expenses, related party		$ 29.0
Payables, related party			$ 0.5
Chairman, Board of Directors \| Lease Agreements
Related Party Transaction [Line Items]
Expenses, related party	$ 0.6	0.6
Executive Officers \| Related Customer
Related Party Transaction [Line Items]
Receivables, related party	0.8		$ 0.8
Charges, related party	0.3	0.3
Executive Officers \| Construction Services
Related Party Transaction [Line Items]
Expenses, related party	$ 0.1	$ 0.1