XML 53 R40.htm IDEA: XBRL DOCUMENT
v3.25.1

Revenue - Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 161,615 | $ 184,442
United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 118,264 | 129,839
Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 13,118 | 19,361
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28,202 | 30,121
Asia-Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,031 | 5,121
Oil & Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 96,564 | 113,165
Aerospace & Defense |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 20,404 | 22,118
Industrials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 18,570 | 15,199
Power generation & Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 4,653 | 5,852
Other Process Industries |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 10,253 | 11,900
Infrastructure, Research & Engineering |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 7,221 | 6,586
Petrochemical |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,633 | 4,344
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,317 | 5,278
Operating segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 165,207 | 186,606
Operating segments | North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 128,902 | 150,349
Operating segments | North America | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 114,333 | 129,458
Operating segments | North America | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 13,415 | 17,127
Operating segments | North America | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 666 | 1,153
Operating segments | North America | Asia-Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 488 | 2,611
Operating segments | North America | Oil & Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 85,731 | 103,027
Operating segments | North America | Aerospace & Defense |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 14,007 | 15,375
Operating segments | North America | Industrials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11,688 | 8,909
Operating segments | North America | Power generation & Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,224 | 3,592
Operating segments | North America | Other Process Industries |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,501 | 7,928
Operating segments | North America | Infrastructure, Research & Engineering |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,701 | 3,972
Operating segments | North America | Petrochemical |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,523 | 3,813
Operating segments | North America | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,527 | 3,733
Operating segments | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 33,214 | 33,047
Operating segments | International | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 542 | 296
Operating segments | International | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,831 | 2,295
Operating segments | International | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28,782 | 28,663
Operating segments | International | Asia-Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,059 | 1,793
Operating segments | International | Oil & Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 10,646 | 10,066
Operating segments | International | Aerospace & Defense |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,281 | 6,732
Operating segments | International | Industrials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,517 | 5,853
Operating segments | International | Power generation & Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 985 | 1,682
Operating segments | International | Other Process Industries |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,744 | 3,933
Operating segments | International | Infrastructure, Research & Engineering |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,562 | 2,205
Operating segments | International | Petrochemical |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 110 | 531
Operating segments | International | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,369 | 2,045
Operating segments | Products & Systems |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,091 | 3,210
Operating segments | Products & Systems | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,373 | 1,600
Operating segments | Products & Systems | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 16 | 177
Operating segments | Products & Systems | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 751 | 651
Operating segments | Products & Systems | Asia-Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 951 | 782
Operating segments | Products & Systems | Oil & Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 187 | 72
Operating segments | Products & Systems | Aerospace & Defense |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 116 | 11
Operating segments | Products & Systems | Industrials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 365 | 437
Operating segments | Products & Systems | Power generation & Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 444 | 578
Operating segments | Products & Systems | Other Process Industries |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8 | 39
Operating segments | Products & Systems | Infrastructure, Research & Engineering |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 958 | 409
Operating segments | Products & Systems | Petrochemical |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Operating segments | Products & Systems | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,013 | 1,664
Corp/Elim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (3,592) | (2,164)
Corp/Elim | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,016 | (1,515)
Corp/Elim | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (3,144) | (238)
Corp/Elim | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (1,997) | (346)
Corp/Elim | Asia-Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (467) | (65)
Corp/Elim | Oil & Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Aerospace & Defense |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Industrials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Power generation & Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Other Process Industries |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Infrastructure, Research & Engineering |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Petrochemical |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 | 0
Corp/Elim | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ (3,592) | $ (2,164)

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mg_OtherAmericasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_OilGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_AerospaceandDefenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_IndustrialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_PowerGenerationandTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_OtherProcessIndustriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_InfrastructureResearchandEngineeringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_PetrochemicalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mg_OtherProductsandServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mg_NorthAmericaSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mg_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mg_ProductsandSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=mg_CorporateAndEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |