v2.4.0.8

Investments - Other Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Investments [Line Items] |  |
Other investments | $ 5,773 | $ 5,092
% of Total fair value | 100.00% | 100.00%
Investments in limited partnerships [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments | 4,773 | 4,092
% of Total fair value | 82.70% | 80.40%
Unfunded commitment on investments in limited partnerships | 1,380 |
Other [Member] |  |
Schedule of Investments [Line Items] |  |
Other investments | $ 1,000 | $ 1,000
% of Total fair value | 17.30% | 19.60%

X
- Definition Other Commitment, Unfunded + References No definition available. + Details
Name: | mhld_OtherCommitmentUnfunded
Namespace Prefix: | mhld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_OtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration