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Debt - Availability Under The Senior Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Debt Disclosure [Abstract]    
Senior credit facility $ 200,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 200,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Capacity Constraint Due To Senior Leverage Ratio 11,818mtrx_CapacityConstraintDueToSeniorLeverageRatio 0mtrx_CapacityConstraintDueToSeniorLeverageRatio
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 188,182mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint 200,000mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint
Line of Credit Facility, Amount Outstanding 11,789us-gaap_LineOfCredit 11,621us-gaap_LineOfCredit
Letters of credit subject to the credit facility 30,526mtrx_LettersOfCreditSubjectToCreditFacility 23,017mtrx_LettersOfCreditSubjectToCreditFacility
Availability under the senior credit facility $ 145,867us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity $ 165,362us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity