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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
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Deferred Charges, Insurers [Abstract] |  |  |  |
Agents' commissions | $ 15,351 amsf_DeferredPolicyAcquisitionCostsAgentsCommissions | $ 15,511 amsf_DeferredPolicyAcquisitionCostsAgentsCommissions |  |
Premium taxes | 3,100 amsf_DeferredPolicyAcquisitionCostsPremiumTaxes | 2,526 amsf_DeferredPolicyAcquisitionCostsPremiumTaxes |  |
Deferred underwriting expenses | 1,198 amsf_DeferredPolicyAcquisitionCostsDeferredUnderwritingExpenses | 1,134 amsf_DeferredPolicyAcquisitionCostsDeferredUnderwritingExpenses |  |
Total deferred policy acquisition costs | $ 19,649 us-gaap_DeferredPolicyAcquisitionCosts | $ 19,171 us-gaap_DeferredPolicyAcquisitionCosts | $ 18,419 us-gaap_DeferredPolicyAcquisitionCosts | $ 16,578 us-gaap_DeferredPolicyAcquisitionCosts

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- Definition Deferred Policy Acquisition Costs Agents Commissions + References No definition available. + Details
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- Definition Deferred Policy Acquisition Costs Deferred Underwriting Expenses + References No definition available. + Details
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- Definition Deferred Policy Acquisition Costs Premium Taxes + References No definition available. + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755678&loc=d3e11446-158418 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 + Details
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