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

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- Definition Junior Surplus Notes + References No definition available. + Details
Name: | abk_JuniorSurplusNotes
Namespace Prefix: | abk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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