v2.4.0.6

Subsequent Event - Additional Information (Detail) (Subsequent Event, Car Care Plan (Holding) Limited (CCPH), USD $) In Thousands, unless otherwise specified | Oct. 31, 2012 Employees
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Subsequent Event [Line Items] |
Entity number of employees | 350
Estimated purchase price | $ 70,000
Period for which sellar cannot conduct or participate in a business that competes with sold unit | 3 years
Period for which sellar cannot solicitate key employees of sold unit for employment | 3 years
Period for customary warranties | 18 months
IGI Group |
Subsequent Event [Line Items] |
Number of reinsurance agreement | 2

X
- Definition Business Acquisition, Cost of Acquired Entity, Estimated Purchase Price + References No definition available. + Details
Name: | afsi_BusinessAcquisitionCostOfAcquiredEntityEstimatedPurchasePrice
Namespace Prefix: | afsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of Reinsurance Agreement + References No definition available. + Details
Name: | afsi_NumberOfReinsuranceAgreement
Namespace Prefix: | afsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period for Customary Warranties + References No definition available. + Details
Name: | afsi_PeriodForCustomaryWarranties
Namespace Prefix: | afsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period for Which Sellar Cannot Solicitate Key Employees of Sold Unit for Employment + References No definition available. + Details
Name: | afsi_PeriodForWhichSellarCannotSolicitateKeyEmployeesOfSoldUnitForEmployment
Namespace Prefix: | afsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of Time for which Sellar Cannot Conduct or Participate in a Business that Competes With Sold Segment + References No definition available. + Details
Name: | afsi_PeriodOfTimeForWhichSellarCannotConductOrParticipateInBusinessThatCompetesWithSoldSegment
Namespace Prefix: | afsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration