v3.21.2

Investments - Other Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Carrying value | $ 51,752 | $ 30,439
% of Total | 58.60% | 45.40%
Other investments | $ 88,238 | $ 67,010
% of Total | 100.00% | 100.00%
Private equity investments |  |
Schedule of Investments [Line Items] |  |
Carrying value | $ 27,544 | $ 23,294
% of Total | 31.20% | 34.80%
Private credit lending investments |  |
Schedule of Investments [Line Items] |  |
Carrying value | $ 8,451 | $ 1,301
% of Total | 9.60% | 1.90%
Investment in limited partnerships |  |
Schedule of Investments [Line Items] |  |
Carrying value | $ 13,957 | $ 3,044
% of Total | 15.80% | 4.50%
Other investments |  |
Schedule of Investments [Line Items] |  |
Carrying value | $ 1,800 | $ 2,800
% of Total | 2.00% | 4.20%
Investments in direct lending entities |  |
Schedule of Investments [Line Items] |  |
Other investments | $ 36,486 | $ 36,571
% of Total | 41.40% | 54.60%

X
- Definition Other Investments, Percent of Total + References No definition available. + Details
Name: | mhld_OtherInvestmentsPercentOfTotal
Namespace Prefix: | mhld_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Other Investments, Percent of Total Fair Value + References No definition available. + Details
Name: | mhld_OtherInvestmentsPercentOfTotalFairValue
Namespace Prefix: | mhld_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of the other investment not readily marketable determined by management based upon fair value methods, including pricing of similar securities and valuation techniques, that was used to record the investment for financial reporting purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710923&loc=d3e45360-110995 + Details
Name: | us-gaap_OtherInvestmentNotReadilyMarketableFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=mhld_PrivateCreditLendingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=srt_PartnershipInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=mhld_DirectLendingEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |