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Acquisitions (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 3 Months Ended | 6 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2013 Matrix NAC | Dec. 31, 2013 Matrix NAC | Dec. 31, 2012 Matrix NAC | Dec. 31, 2013 Matrix NAC | Dec. 31, 2012 Matrix NAC | Dec. 31, 2013 Pelichem
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  | Dec. 21, 2013 |  | Dec. 31, 2012
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00% | 100.00% |  | 100.00% |  |
Business Acquisition, Name of Acquired Entity |  |  | Kvaerner North American Construction, Ltd. and substantially all of the assets of Kvaerner North American Construction, Inc |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | $ 88,100,000 |  |
Goodwill | 67,122,000 |  | 67,122,000 |  | 30,836,000 | 36,311,000 | 36,311,000 |  | 36,311,000 |  | 2,247,000
Tax deductible goodwill |  |  |  |  |  | 28,500,000 | 28,500,000 |  | 28,500,000 |  |
Noncontrolling Interest, Description |  |  |  |  |  |  |  |  | The Joint Venture was formed by Kvaerner North American Construction, Inc. and an engineering firm to engineer and construct a combined cycle power plant in Dover, Delaware. |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  | 65.00% | 65.00% |  | 65.00% |  |
mtrx_JointVentureValue |  |  |  |  |  | 2,000,000 | 2,000,000 |  | 2,000,000 |  |
mtrx_ControllingInterestOfJointVenture,Value |  |  |  |  |  | 1,300,000 | 1,300,000 |  | 1,300,000 |  |
Noncontrolling interest of consolidated joint venture |  |  |  |  | 0 | 700,000 | 700,000 |  | 700,000 |  |
mtrx_JointVentureAssetValue,Total |  |  |  |  |  | 27,700,000 | 27,700,000 |  | 27,700,000 |  |
mtrx_JointVentureAssetValue,Cash |  |  |  |  |  | 17,600,000 | 17,600,000 |  | 17,600,000 |  |
mtrx_JointVentureAssetValue,Receivables |  |  |  |  |  | 10,100,000 | 10,100,000 |  | 10,100,000 |  |
mtrx_JointVentureLiabilityValue,Total |  |  |  |  |  | 25,800,000 | 25,800,000 |  | 25,800,000 |  |
mtrx_JointVentureLiabilityValue,BillingsInExcessOfCostsAndEstimatedEarnings |  |  |  |  |  | 20,900,000 | 20,900,000 |  | 20,900,000 |  |
mtrx_JointVentureLiabilityValue,Payables |  |  |  |  |  | 4,900,000 | 4,900,000 |  | 4,900,000 |  |
Revenues | 310,998,000 | 221,436,000 | 537,215,000 | 431,044,000 |  | 5,400,000 |  |  |  |  |
Operating income | 14,817,000 | 8,772,000 | 25,579,000 | 16,696,000 |  | 0 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  | 2,000,000 |  |
Amortization Expense |  |  |  |  |  |  | 1,100,000 | 1,100,000 | 2,100,000 | 2,100,000 |
Depreciation Expense |  |  |  |  |  |  | 600,000 | 600,000 | 1,200,000 | 1,200,000 |
Acquisition related costs |  |  |  |  |  |  | (2,000,000) | 0 | (2,000,000) | 2,000,000 |
Interest Income |  |  |  |  |  |  | $ (600,000) |  | $ (600,000) |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 + Details
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