XML 80 R69.htm IDEA: XBRL DOCUMENT
v3.21.1

Debt - Schedule of Capital Leases Mature by 2025 (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($)
Line Of Credit Facility [Line Items] |
Payments | $ 6,840
Interest | 689
Principal | 6,151
2022 |
Line Of Credit Facility [Line Items] |
Payments | 2,727
Interest | 341
Principal | 2,386
2023 |
Line Of Credit Facility [Line Items] |
Payments | 2,203
Interest | 227
Principal | 1,976
2024 |
Line Of Credit Facility [Line Items] |
Payments | 1,403
Interest | 98
Principal | 1,305
2025 |
Line Of Credit Facility [Line Items] |
Payments | 507
Interest | 23
Principal | $ 484

X
- Definition Finance lease principal and interest payment liability. + References No definition available. + Details
Name: | meg_FinanceLeasePrincipalAndInterestPaymentLiability
Namespace Prefix: | meg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest paid on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 + Details
Name: | us-gaap_FinanceLeaseInterestPaymentOnLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
Name: | us-gaap_FinanceLeasePrincipalPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=meg_CapitalLeaseInterestPaymentsYearOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=meg_CapitalLeaseInterestPaymentsYearTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=meg_CapitalLeaseInterestPaymentsYearThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=meg_CapitalLeaseInterestPaymentsYearFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |