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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	May 31, 2011	Mar. 31, 2011
Surplus notes		$ 3,000
Junior surplus notes	$ 36,082

X

- Definition

Junior Surplus Notes Par Value

+ References

No definition available.

+ Details

Name:	abk_JuniorSurplusNotesParValue
Namespace Prefix:	abk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

+ Details

Name:	us-gaap_SurplusNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant