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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Short-term investments | $ 33,684 us-gaap_ShortTermInvestments | $ 84,422 us-gaap_ShortTermInvestments |  |
Fixed-maturity securities-available-for-sale, at fair value | 331,242 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 237,877 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  |
Other investments | 11,748 us-gaap_OtherInvestments | 10,591 us-gaap_OtherInvestments |  |
Total investments | 1,016,333 us-gaap_Investments | 878,775 us-gaap_Investments |  |
Cash and cash equivalents | 90,956 us-gaap_CashAndCashEquivalentsAtCarryingValue | 123,077 us-gaap_CashAndCashEquivalentsAtCarryingValue | 92,676 us-gaap_CashAndCashEquivalentsAtCarryingValue | 45,536 us-gaap_CashAndCashEquivalentsAtCarryingValue
Deferred income taxes | 31,231 us-gaap_DeferredTaxAssetsNet | 33,645 us-gaap_DeferredTaxAssetsNet |  |
Property and equipment, net | 7,240 us-gaap_PropertyPlantAndEquipmentNet | 7,549 us-gaap_PropertyPlantAndEquipmentNet |  |
Other assets | 14,287 us-gaap_OtherAssets | 8,637 us-gaap_OtherAssets |  |
Total assets | 1,457,220 us-gaap_Assets | 1,329,001 us-gaap_Assets |  |
Liabilities: |  |  |  |
Accounts payable and other liabilities | 30,110 us-gaap_OtherLiabilities | 26,940 us-gaap_OtherLiabilities |  |
Total liabilities | 1,010,252 us-gaap_Liabilities | 912,187 us-gaap_Liabilities |  |
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2014 and 2013) | 446,968 us-gaap_StockholdersEquity | 416,814 us-gaap_StockholdersEquity | 381,222 us-gaap_StockholdersEquity | 349,437 us-gaap_StockholdersEquity
Total liabilities and shareholders' equity | 1,457,220 us-gaap_LiabilitiesAndStockholdersEquity | 1,329,001 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Short-term investments | 250 us-gaap_ShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 248 us-gaap_ShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Fixed-maturity securities-available-for-sale, at fair value |  | 965 us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other investments | 11,748 us-gaap_OtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,591 us-gaap_OtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 387,954 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 352,193 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total investments | 399,952 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 363,997 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash and cash equivalents | 43,585 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47,726 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31,792 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,887 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred income taxes | 1,001 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,383 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Notes receivable from subsidiaries | (1)us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,805 us-gaap_NotesReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property and equipment, net | 2,070 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,181 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 4,992 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 556 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 451,599 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 417,648 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities: |  |  |  |
Accounts payable and other liabilities | 3,853 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 834 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Notes payable to subsidiaries | 778 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total liabilities | 4,631 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 834 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Shareholders' equity (net of Treasury stock of $22,370 at December 31, 2014 and 2013) | 446,968 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 416,814 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and shareholders' equity | $ 451,599 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 417,648 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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