Debt Instrument, Holders Percentage

No definition available.

Name:	mtz_DebtInstrumentHoldersPercentage
Namespace Prefix:	mtz_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

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+ Details

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=mtz_FivePointNinePercentSeniorNotesMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_DomesticLineOfCreditMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Debt - 2024 Debt Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Jul. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 10, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Financing costs		$ 15,900			$ 15,900			$ 13,500
Pre-tax debt extinguishment loss		$ 0		$ 0	$ 11,344	$ 0
5.900% Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 550,000
Debt instrument, interest rate (percentage)							5.90%
Financing costs							$ 5,900
Debt instrument, redemption price (percentage)					101.00%
Debt instrument, holders percentage							0.25
6.625% Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)		6.625%			6.625%
Debt instrument, redemption price (percentage)	95.00%				100.00%
Debt instrument, repurchase amount	$ 21,400	$ 203,700			$ 203,700
New Term Loan Facility, Three-Year Tranche \| Line of Credit \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400,000			400,000
Pre-tax debt extinguishment loss			$ 11,300		$ 11,300
New Term Loan Facility, Three-Year Tranche \| Credit Facility \| Term Loan
Debt Instrument [Line Items]
Debt instrument, term					3 years