Name:	mtz_InterestCoverageRatio
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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.

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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.

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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.

No definition available.

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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.

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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.

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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.

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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.

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

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Data Type:	num:percentItemType
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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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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

No definition available.

Name:	us-gaap_DebtIssuanceCosts
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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Data Type:	xbrli:monetaryItemType
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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

Date the first payment under the line of credit must be paid, 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Data Type:	xbrli:dateItemType
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Period Type:	duration

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

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Period Type:	duration

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

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Data Type:	xbrli:stringItemType
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Period Type:	duration

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

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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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.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of the required periodic payment applied to principal.

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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).

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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.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	duration

Indebtedness divided by net capital.

No definition available.

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

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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_DomesticLineOfCreditMember
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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_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
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Data Type:	na
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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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Name:	us-gaap_StatementScenarioAxis=mtz_BaseRateOption2Member
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Data Type:	na
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Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialStandbyLetterOfCreditMember
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