XML 104 R93.htm IDEA: XBRL DOCUMENT
v3.21.1

Subsequent Events - Summary of Term Loan Amortization (Details) - Subsequent Event - 2021 Credit Facility - Term Loan Facility | Apr. 27, 2021
--- | ---
Subsequent Event [Line Items] |
Amortization percentage, Year 1 | 5.00%
Amortization percentage, Year 2 | 5.00%
Amortization percentage, Year 3 | 7.50%
Amortization percentage, Year 4 | 7.50%
Amortization percentage, Year 5 | 10.00%

X
- Definition Debt instrument amortization percentage year five. + References No definition available. + Details
Name: | meg_DebtInstrumentAmortizationPercentageYearFive
Namespace Prefix: | meg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument amortization percentage year four. + References No definition available. + Details
Name: | meg_DebtInstrumentAmortizationPercentageYearFour
Namespace Prefix: | meg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument amortization percentage year one. + References No definition available. + Details
Name: | meg_DebtInstrumentAmortizationPercentageYearOne
Namespace Prefix: | meg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument amortization percentage year three. + References No definition available. + Details
Name: | meg_DebtInstrumentAmortizationPercentageYearThree
Namespace Prefix: | meg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument amortization percentage year two. + References No definition available. + Details
Name: | meg_DebtInstrumentAmortizationPercentageYearTwo
Namespace Prefix: | meg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=meg_TwentyTwentyOneCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=meg_TermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |