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Debt - Additional Information (Detail) (USD $)
 6 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Acquired Indefinite-lived Intangible Assets [Line Items]    
Credit Agreement Term 5 years  
Senior secured revolving credit facility $ 200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
mtrx_LineOfCreditFacilityExpirationDate Mar. 13, 2019  
Senior Leverage Ratio, Maximum 2.50mtrx_SeniorLeverageRatioMax  
Senior Leverage Ratio, Minimum 1.00mtrx_SeniorLeverageRatioMin  
Fixed Charge Coverage Ratio, Maximum 1.25mtrx_FixedChargeCoverageRatioMaximum  
Fixed Charge Coverage Ratio, Minimum 1.00mtrx_FixedChargeCoverageRatioMinimum  
Limit on asset dispositions 20,000,000mtrx_MtrxAmountOfLimitOnAssetDispositions  
Additional Margin on alternate base rate loans, Minimum 0.25%mtrx_LineOfCreditBasisSpreadOnAlternateBaseRateMinimum  
Additional Margin on alternate base rate loans, Maximum 1.00%mtrx_LineOfCreditBasisSpreadOnAlternateBaseRateMaximum  
Additional Margin on LIBOR loans, Minimum 1.25%mtrx_LineOfCreditBasisSpreadOnLondonInterbankOfferedRateMinimum  
Additional Margin on LIBOR loans, Maximum 2.00%mtrx_LineOfCreditBasisSpreadOnLondonInterbankOfferedRateMaximum  
Sublimit on Canadian dollar borrowings 40,000,000mtrx_AmountOfLimitOnCanadianDollarBorrowings  
Additional Margin on CDOR loans, Minimum 1.25%mtrx_LineOfCreditBasisSpreadOnCanadianDepositOfferedRateMinimum  
Additional Margin on CDOR loans, Maximum 2.00%mtrx_LineOfCreditBasisSpreadOnCanadianDepositOfferedRateMaximum  
Additional Margin on Canadian prime rate loans, Minimum 1.75%mtrx_LineOfCreditBasisSpreadOnCanadianPrimeRateMinimum  
Additional Margin on Canadian prime rate loans, Maximum 2.50%mtrx_LineOfCreditBasisSpreadOnCanadianPrimeRateMaximum  
CDOR Rate description sum of the annual rate of interest, which is the rate determined as being the arithmetic average of the quotations of all institutions listed in respect of the relevant CDOR interest period for Canadian Dollar denominated bankers’ acceptances, plus 0.1%  
Canadian prime rate description greater of (i) the rate of interest per annum most recently announced or established by JPMorgan Chase Bank, N.A., Toronto Branch as its reference rate in effect on such day for determining interest rates for Canadian Dollar denominated commercial loans in Canada and (ii) the CDOR Rate plus 1.0%.  
Maximum limit of consolidated funded indebtedness 2.5mtrx_MaximumLimitOfConsolidatedFundedIndebtedness  
Consolidated EBITDA as defined in the Credit Agreement 75,300,000mtrx_ConsolidatedEarningsBeforeInterestTaxesDepreciationAndAmortizationPerCreditAgreement  
Consolidated funded indebtedness $ 34,200,000mtrx_ConsolidatedFundedIndebtedness  
Minimum [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Unused Credit Facility Fee 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Unused Credit Facility Fee 0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
CDOR Rate [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Basis spread on variable rate basis 0.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= mtrx_CdorRateMember		  
Canadian Prime Rate [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Variable rate basis CDOR  
Basis spread on variable rate basis 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= mtrx_CanadianPrimeRateMember