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Consolidated Statements of Cash Flows (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	May 31, 2011
Consolidated Statements of Cash Flows [Abstract]
Surplus notes	$ 3,000
Junior surplus notes		$ 36,082

X

- Definition

Junior surplus notes.

+ References

No definition available.

+ Details

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Namespace Prefix:	abk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6486086&loc=d3e24387-158525

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