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The carrying value as of the balance sheet date of the portion of the revolving credit facility obligation which is denominated in foreign currencies.

No definition available.

Name:	mtz_LineOfCreditFacilityAmountDenominatedInForeignCurrencies
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of borrowing capacity currently available in either Canadian dollars or Mexican pesos that is included in the total amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

No definition available.

Name:	mtz_LineOfCreditFacilityRemainingBorrowingCapacityInForeignCurrency
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The portion of the maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for letters of credit that is available in Canadian dollars or Mexican pesos.

No definition available.

Name:	mtz_LineOfCreditLetterOfCreditSublimitCanadianDollarsOrMexicanPesos
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Sublimit or portion of maximum borrowing capacity available on an existing line of credit in Canadian dollars or Mexican pesos.

No definition available.

Name:	mtz_LineOfCreditRevolvingLoanSublimitCanadianDollarsOrMexicanPesos
Namespace Prefix:	mtz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Sublimit or portion of maximum borrowing capacity available on an existing line of credit.

No definition available.

Name:	mtz_LineofCreditRevolvingLoanSublimit
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Number of times during the term of the Credit Facility that the right to permit the consolidated leverage ratio to exceed a specified threshold may be or has been exercised.

No definition available.

Name:	mtz_NumberOfTimesRightMayBeExercised
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Ratio of Loan Party EBITDA as of the most recent four quarters to Adjusted Consolidated EBITDA as of the most recent four quarters.

No definition available.

Name:	mtz_PercentageOfConsolidatedEBITDAThresholdCombinedSubsidiaryGuarantors1
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Ratio of Loan Party EBITDA as of the most recent four quarters to Adjusted EBITDA as of the most recent four quarters for any domestic subsidiary.

No definition available.

Name:	mtz_PercentageOfConsolidatedEBITDAThresholdIndividualSubsidiaryGuarantors1
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Minimum threshold amount of consideration for permitted acquisition or series of permitted acquisitions during a fiscal quarter in order to permit a higher consolidated leverage ratio range for such a fiscal quarter and the subsequent two fiscal quarters.

No definition available.

Name:	mtz_PermittedAcquisitionsAmountAdjustedRatioofIndebtednesstoNetCapital
Namespace Prefix:	mtz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

No definition available.

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Date the credit facility terminates, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Description of the frequency of periodic payments, which may be presented in a variety of ways (for example, monthly, quarterly, annually).

Name:	us-gaap_LineOfCreditFacilityFrequencyOfPayments
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The effective interest rate at the end of the reporting period.

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

Amount of the required periodic payment applied to principal.

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

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

No definition available.

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Indebtedness divided by net capital.

No definition available.

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_DomesticLineOfCreditMember
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Data Type:	na
Balance Type:
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Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioPlanMember
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Data Type:	na
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Name:	us-gaap_StatementScenarioAxis=mtz_BaseRateOption1Member
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsPurchasedMember
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Data Type:	na
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Name:	us-gaap_StatementScenarioAxis=mtz_BaseRateOption3Member
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Data Type:	na
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Name:	us-gaap_VariableRateAxis=mtz_EurocurrencyRateMember
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Name:	us-gaap_StatementScenarioAxis=mtz_BaseRateOption2Member
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Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
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Data Type:	na
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Name:	us-gaap_BusinessAcquisitionAxis=mtz_PermittedAcquisitionMember
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Data Type:	na
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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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Data Type:	na
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Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_CreditFacilityAxis=us-gaap_LoansPayableMember
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Data Type:	na
Balance Type:
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Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialStandbyLetterOfCreditMember
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Data Type:	na
Balance Type:
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Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_CreditFacilityAxis=us-gaap_BridgeLoanMember
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