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Intangible Assets Including Goodwill - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Impairment charge | $ 25,000,000 us-gaap_GoodwillImpairmentLoss | [1] |  |  |
Amortization expense |  |  | 2,400,000 us-gaap_AmortizationOfIntangibleAssets | 500,000 us-gaap_AmortizationOfIntangibleAssets |
2014 | 2,584,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  | 2,584,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |
2015 | 3,375,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  | 3,375,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2016 | 3,291,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  | 3,291,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2017 | 2,950,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  | 2,950,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2018 | 2,583,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  | 2,583,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 12,014,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  | 12,014,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |
Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived Intangible Assets, Fair Value Disclosure | 900,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 900,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
SM Electric Trade Name [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-Lived Trade Names | $ 1,400,000 us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mtrx_SMElectricTradeNameMember |  | $ 1,400,000 us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mtrx_SMElectricTradeNameMember |  |
Minimum [Member] | Intellectual Property [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 6 years |  | 6 years
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 1 year 6 months |  | 1 year 6 months
Minimum [Member] | Noncompete Agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 years |  | 3 years
Maximum [Member] | Intellectual Property [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  | 15 years
Maximum [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  | 15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 10 years |  |
Maximum [Member] | Noncompete Agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 5 years |  | 5 years
Trade Names [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 years |  | 5 years
[1] | A $25.0 million impairment charge was recorded in February 2005 as a result of the Company’s operating performance in fiscal 2005.

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