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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
Cash and cash equivalents	$ 115,397us-gaap_CashAndCashEquivalentsAtCarryingValue		$ 117,275us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 347,392us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 229,685us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity securities, at fair value	19,642us-gaap_AvailableForSaleSecuritiesEquitySecurities		65,022us-gaap_AvailableForSaleSecuritiesEquitySecurities
Fixed maturities, at fair value	353,949us-gaap_AvailableForSaleSecuritiesDebtSecurities		289,418us-gaap_AvailableForSaleSecuritiesDebtSecurities
Other receivables	2,763us-gaap_OtherReceivables		2,587us-gaap_OtherReceivables
Income taxes recoverable	5,675us-gaap_IncomeTaxReceivable		8,152us-gaap_IncomeTaxReceivable
Deferred income taxes	11,850us-gaap_DeferredTaxAssetsLiabilitiesNet		12,051us-gaap_DeferredTaxAssetsLiabilitiesNet
Other assets	2,812us-gaap_OtherAssets		2,072us-gaap_OtherAssets
Total assets	911,774us-gaap_Assets		920,090us-gaap_Assets
LIABILITIES:
Accounts payable	4,121us-gaap_AccountsPayableCurrentAndNoncurrent		3,441us-gaap_AccountsPayableCurrentAndNoncurrent
Income taxes payable	1,799us-gaap_AccruedIncomeTaxes		2,566us-gaap_AccruedIncomeTaxes
Long-term debt	30,610us-gaap_LongTermDebt		37,240us-gaap_LongTermDebt
Other accrued expenses	36,318us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent		34,386us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
Total liabilities	692,858us-gaap_Liabilities		744,481us-gaap_Liabilities
Contingently redeemable common stock	19,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
STOCKHOLDERS' EQUITY:
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 12 and 30 Outstanding shares - 12 and 30 Minimum liquidation preference, $8.49 and $6.98 per share
Common stock, $.01 par value	448us-gaap_CommonStockValue		436us-gaap_CommonStockValue
Treasury shares, at cost - 9,667 and 8,275	(62,153)us-gaap_TreasuryStockValue		(35,467)us-gaap_TreasuryStockValue
Additional paid-in capital (See Notes 8 and 18)	40,987us-gaap_AdditionalPaidInCapital		42,282us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (loss), net of taxes	(1,835)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(376)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings	222,469us-gaap_RetainedEarningsAccumulatedDeficit		168,734us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity (See Notes 8 and 18)	199,916us-gaap_StockholdersEquity	[1]	175,609us-gaap_StockholdersEquity	163,514us-gaap_StockholdersEquity	150,005us-gaap_StockholdersEquity
Total liabilities, contingently redeemable common stock and stockholders' equity	911,774us-gaap_LiabilitiesAndStockholdersEquity		920,090us-gaap_LiabilitiesAndStockholdersEquity
Parent Company [Member]
ASSETS
Cash and cash equivalents	14,890us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		4,878us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	17,733us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6,900us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investments in subsidiaries and undistributed earnings	216,656us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		174,068us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity securities, at fair value	627us-gaap_AvailableForSaleSecuritiesEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		10,474us-gaap_AvailableForSaleSecuritiesEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Fixed maturities, at fair value	2,967us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		750us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other receivables			244us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes recoverable	5,675us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		8,152us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred income taxes	11,850us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		12,052us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other assets	1,040us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		346us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets	253,705us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		210,964us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
LIABILITIES:
Accounts payable	169us-gaap_AccountsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		146us-gaap_AccountsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes payable	1,799us-gaap_AccruedIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		2,566us-gaap_AccruedIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Long-term debt	13,330us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		18,490us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other accrued expenses	19,491us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		14,153us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities	34,789us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		35,355us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Contingently redeemable common stock	19,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
STOCKHOLDERS' EQUITY:
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 12 and 30 Outstanding shares - 12 and 30 Minimum liquidation preference, $8.49 and $6.98 per share
Common stock, $.01 par value	448us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		436us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Treasury shares, at cost - 9,667 and 8,275	(62,153)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		(35,467)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Additional paid-in capital (See Notes 8 and 18)	40,987us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		42,282us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accumulated other comprehensive income (loss), net of taxes	(1,835)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		(376)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Retained earnings	222,469us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		168,734us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total stockholders' equity (See Notes 8 and 18)	199,916us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		175,609us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities, contingently redeemable common stock and stockholders' equity	$ 253,705us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		$ 210,964us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
[1] See Note 8 - Stockholders’ Equity for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.

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