v3.22.1

Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Variable Interest Entity [Line Items] |  |
Deferred gain on retroactive reinsurance | $ (5,184) | $ 0
Genesis Legacy Solutions |  |
Variable Interest Entity [Line Items] |  |
Insurance related liabilities | 37,120 |
Insurance reserves | 29,175 |
Deferred gain on retroactive reinsurance | $ 7,945 |

X
- Definition Deferred Gain On Retroactive Reinsurance + References No definition available. + Details
Name: | mhld_DeferredGainOnRetroactiveReinsurance
Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Insurance Related Liabilities + References No definition available. + Details
Name: | mhld_InsuranceRelatedLiabilities
Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Insurance Reserves + References No definition available. + Details
Name: | mhld_InsuranceReserves
Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | dei_LegalEntityAxis=mhld_GenesisLegacySolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |