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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 $ 25,000,000us-gaap_GoodwillImpairmentLoss [1]      
Amortization expense   2,400,000us-gaap_AmortizationOfIntangibleAssets 500,000us-gaap_AmortizationOfIntangibleAssets  
2014 2,584,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear 2,584,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
2015 3,375,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo 3,375,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2016 3,291,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree 3,291,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2017 2,950,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour 2,950,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2018 2,583,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive 2,583,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 12,014,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive 12,014,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived Intangible Assets, Fair Value Disclosure 900,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 900,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		    
SM Electric Trade Name [Member]        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-Lived Trade Names $ 1,400,000us-gaap_FiniteLivedTradeNamesGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mtrx_SMElectricTradeNameMember		 $ 1,400,000us-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.