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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 |

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

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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
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Namespace Prefix: | us-gaap_
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Period Type: | instant