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Deferred Policy Acquisition Costs - Schedule of Major Categories of the Deferred Policy Acquisition Costs (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Charges, Insurers [Abstract]        
Agents' commissions $ 15,351amsf_DeferredPolicyAcquisitionCostsAgentsCommissions $ 15,511amsf_DeferredPolicyAcquisitionCostsAgentsCommissions    
Premium taxes 3,100amsf_DeferredPolicyAcquisitionCostsPremiumTaxes 2,526amsf_DeferredPolicyAcquisitionCostsPremiumTaxes    
Deferred underwriting expenses 1,198amsf_DeferredPolicyAcquisitionCostsDeferredUnderwritingExpenses 1,134amsf_DeferredPolicyAcquisitionCostsDeferredUnderwritingExpenses    
Total deferred policy acquisition costs $ 19,649us-gaap_DeferredPolicyAcquisitionCosts $ 19,171us-gaap_DeferredPolicyAcquisitionCosts $ 18,419us-gaap_DeferredPolicyAcquisitionCosts $ 16,578us-gaap_DeferredPolicyAcquisitionCosts