v2.4.0.8

Investments - Restricted Cash and Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Restricted Cash and Investments Items [Line Items]
Restricted cash and cash equivalents	$ 151,212	$ 77,360
Restricted investments	2,209,299	2,154,338
Restricted cash and investments	2,360,511	2,231,698
Amortized cost	3,101,758	3,132,314
Third party agreements [Member]
Restricted Cash and Investments Items [Line Items]
Restricted cash and cash equivalents	64,326	72,877
Restricted investments	952,147	939,800
Amortized cost	934,906	933,897
Related party agreements [Member]
Restricted Cash and Investments Items [Line Items]
Restricted cash and cash equivalents	86,866	4,429
Restricted investments	1,244,654	1,201,473
Amortized cost	1,211,944	1,183,156
US state regulatory authorities [Member]
Restricted Cash and Investments Items [Line Items]
Restricted cash and cash equivalents	20	54
Restricted investments	12,498	13,065
Amortized cost	$ 12,216	$ 12,730

X

- Definition

Investments, Original or Amortized Cost Basis

+ References

No definition available.

+ Details

Name:	mhld_InvestmentsOriginalOrAmortizedCostBasis
Namespace Prefix:	mhld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	mhld_RestrictedCashAndInvestmentsLineItems
Namespace Prefix:	mhld_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

+ Details

Name:	us-gaap_RestrictedCashAndInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

+ Details

Name:	us-gaap_RestrictedInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant