XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.21.2

Revenue - Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 174,556 | $ 147,894 | $ 505,968 | $ 431,794
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 122,948 | 101,405 | 352,547 | 301,596
Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22,650 | 19,818 | 64,438 | 53,167
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 26,620 | 25,054 | 83,094 | 71,578
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,338 | 1,617 | 5,889 | 5,453
Oil & Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 97,498 | 81,995 | 291,805 | 241,179
Aerospace & Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 16,715 | 14,652 | 49,825 | 54,860
Industrials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17,589 | 17,912 | 49,438 | 50,720
Power Generation & Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 14,687 | 11,497 | 37,044 | 28,646
Other Process Industries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11,886 | 8,481 | 36,681 | 24,291
Infrastructure, Research & Engineering |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10,411 | 8,777 | 27,733 | 23,229
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5,770 | 4,580 | 13,442 | 8,869
Operating segments | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 144,976 | 119,721 | 414,251 | 349,271
Operating segments | Services | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 122,506 | 100,586 | 349,814 | 298,372
Operating segments | Services | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 21,681 | 18,767 | 61,847 | 49,548
Operating segments | Services | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 491 | 350 | 1,381 | 721
Operating segments | Services | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 298 | 18 | 1,209 | 630
Operating segments | Services | Oil & Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 88,508 | 72,195 | 264,959 | 214,773
Operating segments | Services | Aerospace & Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12,717 | 10,904 | 37,319 | 39,804
Operating segments | Services | Industrials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10,560 | 12,209 | 30,621 | 35,374
Operating segments | Services | Power Generation & Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11,412 | 9,053 | 27,019 | 21,800
Operating segments | Services | Other Process Industries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,819 | 6,023 | 27,031 | 17,026
Operating segments | Services | Infrastructure, Research & Engineering |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7,136 | 5,309 | 15,479 | 12,820
Operating segments | Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5,824 | 4,028 | 11,823 | 7,674
Operating segments | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 29,100 | 26,477 | 88,699 | 76,887
Operating segments | International | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 221 | 193 | 670 | 507
Operating segments | International | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,446 | 1,100 | 3,772 | 3,564
Operating segments | International | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 26,378 | 24,790 | 82,356 | 71,056
Operating segments | International | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,055 | 394 | 1,901 | 1,760
Operating segments | International | Oil & Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,620 | 9,749 | 26,208 | 26,192
Operating segments | International | Aerospace & Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,897 | 3,676 | 12,341 | 14,686
Operating segments | International | Industrials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6,693 | 5,261 | 17,736 | 13,997
Operating segments | International | Power Generation & Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,615 | 2,054 | 7,776 | 4,958
Operating segments | International | Other Process Industries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,035 | 2,373 | 9,574 | 7,103
Operating segments | International | Infrastructure, Research & Engineering |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,467 | 2,245 | 9,477 | 6,726
Operating segments | International | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,773 | 1,119 | 5,587 | 3,225
Operating segments | Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,308 | 3,932 | 9,499 | 10,746
Operating segments | Products | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,562 | 1,538 | 4,690 | 5,150
Operating segments | Products | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 133 | 75 | 301 | 425
Operating segments | Products | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 499 | 1,002 | 1,462 | 1,930
Operating segments | Products | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,114 | 1,317 | 3,046 | 3,241
Operating segments | Products | Oil & Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 370 | 51 | 638 | 214
Operating segments | Products | Aerospace & Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 101 | 72 | 165 | 370
Operating segments | Products | Industrials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 336 | 442 | 1,081 | 1,349
Operating segments | Products | Power Generation & Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 660 | 390 | 2,249 | 1,888
Operating segments | Products | Other Process Industries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 32 | 85 | 76 | 162
Operating segments | Products | Infrastructure, Research & Engineering |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 808 | 1,223 | 2,777 | 3,683
Operating segments | Products | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,001 | 1,669 | 2,513 | 3,080
Corp/Elim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (2,828) | (2,236) | (6,481) | (5,110)
Corp/Elim | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (1,341) | (912) | (2,627) | (2,433)
Corp/Elim | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (610) | (124) | (1,482) | (370)
Corp/Elim | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (748) | (1,088) | (2,105) | (2,129)
Corp/Elim | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (129) | (112) | (267) | (178)
Corp/Elim | Oil & Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Corp/Elim | Aerospace & Defense |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Corp/Elim | Industrials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Corp/Elim | Power Generation & Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Corp/Elim | Other Process Industries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Corp/Elim | Infrastructure, Research & Engineering |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Corp/Elim | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ (2,828) | $ (2,236) | $ (6,481) | $ (5,110)

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 No definition available. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + 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_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_ServicesMember
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: |