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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 7,166 us-gaap_NetInvestmentIncome | $ 6,495 us-gaap_NetInvestmentIncome | $ 6,845 us-gaap_NetInvestmentIncome | $ 6,708 us-gaap_NetInvestmentIncome | $ 6,763 us-gaap_NetInvestmentIncome | $ 6,947 us-gaap_NetInvestmentIncome | $ 6,649 us-gaap_NetInvestmentIncome | $ 6,670 us-gaap_NetInvestmentIncome | $ 27,214 us-gaap_NetInvestmentIncome | $ 27,029 us-gaap_NetInvestmentIncome | $ 27,018 us-gaap_NetInvestmentIncome
Fee and other income |  |  |  |  |  |  |  |  | 361 us-gaap_OtherIncome | 534 us-gaap_OtherIncome | 562 us-gaap_OtherIncome
Total revenues | 104,886 us-gaap_Revenues | 102,336 us-gaap_Revenues | 100,624 us-gaap_Revenues | 96,173 us-gaap_Revenues | 94,309 us-gaap_Revenues | 88,003 us-gaap_Revenues | 87,511 us-gaap_Revenues | 86,512 us-gaap_Revenues | 404,019 us-gaap_Revenues | 356,335 us-gaap_Revenues | 321,248 us-gaap_Revenues
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 566 us-gaap_InterestExpense
Total expenses |  |  |  |  |  |  |  |  | 330,270 us-gaap_BenefitsLossesAndExpenses | 297,131 us-gaap_BenefitsLossesAndExpenses | 284,105 us-gaap_BenefitsLossesAndExpenses
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 20,083 us-gaap_IncomeTaxExpenseBenefit | 15,567 us-gaap_IncomeTaxExpenseBenefit | 7,790 us-gaap_IncomeTaxExpenseBenefit
Net income | 16,865 us-gaap_NetIncomeLoss | 13,479 us-gaap_NetIncomeLoss | 12,773 us-gaap_NetIncomeLoss | 10,549 us-gaap_NetIncomeLoss | 17,443 us-gaap_NetIncomeLoss | 9,699 us-gaap_NetIncomeLoss | 7,644 us-gaap_NetIncomeLoss | 8,851 us-gaap_NetIncomeLoss | 53,666 us-gaap_NetIncomeLoss | 43,637 us-gaap_NetIncomeLoss | 29,353 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,541 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,051 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 571 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Fee and other income |  |  |  |  |  |  |  |  | 5,368 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,453 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,765 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total revenues |  |  |  |  |  |  |  |  | 6,909 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,504 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,336 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses |  |  |  |  |  |  |  |  |  |  |
Other operating costs |  |  |  |  |  |  |  |  | 6,909 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,504 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,770 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  |  |  | 566 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses |  |  |  |  |  |  |  |  | 6,909 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,504 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,336 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before income taxes and equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (13)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gain (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 13 amsf_IncomeLossFromContinuingOperationsBeforeMinorityInterestAndIncomeLossFromEquityMethodInvestmentsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6)amsf_IncomeLossFromContinuingOperationsBeforeMinorityInterestAndIncomeLossFromEquityMethodInvestmentsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9 amsf_IncomeLossFromContinuingOperationsBeforeMinorityInterestAndIncomeLossFromEquityMethodInvestmentsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 53,653 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43,643 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 29,344 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 53,666 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 43,637 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 29,353 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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