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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Jun. 30, 2017
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Project Unapproved Change Orders and Claims [Line Items] |  |
Unapproved change orders and claims | $ 10.5 | $ 11.0

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- Definition [Line Items] for Power Generation Project Unapproved Change Orders and Claims [Table] + References No definition available. + Details
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Namespace Prefix: | mtrx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49324-109356 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68053980&loc=d3e50000-109363 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant