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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Aug. 22, 2014 | Dec. 21, 2013 | Jun. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 72,212 us-gaap_Goodwill |  |  |  | $ 69,837 us-gaap_Goodwill
Net purchase price | 5,551 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 51,398 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |
HDB, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  | HDB Ltd. Limited Partnership ("HDB"). |  |
Current assets |  |  | 1,658 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Property, plant and equipment |  |  | 1,001 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Other intangible assets |  |  | 900 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Total assets acquired |  |  | 6,613 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Current liabilities |  |  | 1,062 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Net assets acquired |  |  | 5,551 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 3,054 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Business Combination, Consideration Transferred |  |  | 5,551 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member |  |
Kvaerner NAC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc |
Current assets |  |  |  | 83,575 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Property, plant and equipment |  |  |  | 11,377 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Goodwill |  |  |  | 39,295 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Other intangible assets |  |  |  | 24,009 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Total assets acquired |  |  |  | 158,256 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Current liabilities |  |  |  | 68,115 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Deferred income taxes |  |  |  | 1,179 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Noncontrolling interest of consolidated joint venture | 7,600 us-gaap_MinorityInterestInJointVentures / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |  |  | 700 us-gaap_MinorityInterestInJointVentures / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Net assets acquired |  |  |  | 88,262 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Cash acquired |  |  |  | 36,655 mtrx_Mtrx_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsCash / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Net purchase price |  |  |  | 51,607 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  | 28,500 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |
Business Combination, Consideration Transferred |  |  |  | $ 88,300 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember |

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