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INVESTMENTS (Details 3) - 10K (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt securities | Available for sale securities | SALES      
Summary of the disposition of fixed maturities and equities      
Proceeds From Sales $ 342,308us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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$ 173,694us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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$ 181,338us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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= us-gaap_AvailableforsaleSecuritiesMember
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= us-gaap_DebtSecuritiesMember
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= rli_SalesOfMarketableSecuritiesMember
Gross Realized Gains 7,208us-gaap_GainOnSaleOfInvestments
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= us-gaap_DebtSecuritiesMember
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= rli_SalesOfMarketableSecuritiesMember
3,561us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
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= us-gaap_DebtSecuritiesMember
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= rli_SalesOfMarketableSecuritiesMember
11,208us-gaap_GainOnSaleOfInvestments
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= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
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= rli_SalesOfMarketableSecuritiesMember
Gross Realized Losses (3,664)us-gaap_LossOnSaleOfInvestments
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= us-gaap_AvailableforsaleSecuritiesMember
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= us-gaap_DebtSecuritiesMember
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= rli_SalesOfMarketableSecuritiesMember
(2,597)us-gaap_LossOnSaleOfInvestments
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= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
(43)us-gaap_LossOnSaleOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total 3,544us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
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/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
964us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
11,165us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
Debt securities | Available for sale securities | CALLS/MATURITIES      
Summary of the disposition of fixed maturities and equities      
Proceeds From Sales 101,517us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
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/ us-gaap_InvestmentTypeAxis
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224,620us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
248,134us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
Gross Realized Gains 414us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
379us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
1,806us-gaap_GainOnSaleOfInvestments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
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Gross Realized Losses (3)us-gaap_LossOnSaleOfInvestments
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(5)us-gaap_LossOnSaleOfInvestments
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= us-gaap_DebtSecuritiesMember
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(6)us-gaap_LossOnSaleOfInvestments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
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Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total 411us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
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= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
374us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
1,800us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
Debt securities | Held-to-maturity Securities | SALES      
Summary of the disposition of fixed maturities and equities      
Proceeds From Sales 654us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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= rli_SalesOfMarketableSecuritiesMember
   
Gross Realized Gains 4us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
   
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total 4us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
   
Debt securities | Held-to-maturity Securities | CALLS/MATURITIES      
Summary of the disposition of fixed maturities and equities      
Proceeds From Sales   11,090us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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273,816us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
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Gross Realized Gains   9us-gaap_GainOnSaleOfInvestments
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247us-gaap_GainOnSaleOfInvestments
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= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total   9us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
247us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
Debt securities | Trading | CALLS/MATURITIES      
Summary of the disposition of fixed maturities and equities      
Proceeds From Sales   1us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
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= us-gaap_DebtSecuritiesMember
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= rli_CallsAndMaturitiesOfMarketableSecuritiesMember
 
Equity securities | SALES      
Summary of the disposition of fixed maturities and equities      
Proceeds From Sales 72,869us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
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73,982us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
78,315us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
Gross Realized Gains 29,794us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentTypeAxis
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= rli_SalesOfMarketableSecuritiesMember
21,542us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
19,755us-gaap_GainOnSaleOfInvestments
/ us-gaap_InvestmentTypeAxis
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/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
Gross Realized Losses (326)us-gaap_LossOnSaleOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
(9)us-gaap_LossOnSaleOfInvestments
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= us-gaap_EquitySecuritiesMember
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(3,510)us-gaap_LossOnSaleOfInvestments
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= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total $ 29,468us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
$ 21,533us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ rli_TypeOfTransactionAxis
= rli_SalesOfMarketableSecuritiesMember
$ 16,245us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
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