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INVESTMENTS (Details 2) - 10K (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
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
INVESTMENTS                      
Net realized investment gains (losses), excluding OTTI                 $ 32,182us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments $ 22,036us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments $ 26,528us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
OTTI                     (1,156)us-gaap_ImpairmentOfInvestments
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments, Total 9,542us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 5,708us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 10,431us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 6,501us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 3,611us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 10,999us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 3,742us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 3,684us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 32,182us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 22,036us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 25,372us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
Net changes in unrealized gains (losses) on investments:                 55,180rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments (10,923)rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 39,855rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
Net realized investment gains (losses) and changes in unrealized gains (losses) on investments                 87,362us-gaap_GainLossOnInvestments 11,113us-gaap_GainLossOnInvestments 65,227us-gaap_GainLossOnInvestments
Debt securities | Available for sale securities                      
INVESTMENTS                      
Net realized investment gains (losses), excluding OTTI                 3,955us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
1,338us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
12,965us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Net changes in unrealized gains (losses) on investments:                 37,880rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
(75,228)rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
23,643rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Debt securities | Held-to-maturity Securities                      
INVESTMENTS                      
Net realized investment gains (losses), excluding OTTI                 4us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
9us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
247us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Equity securities                      
INVESTMENTS                      
Net realized investment gains (losses), excluding OTTI                 29,468us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
21,533us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
16,245us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
OTTI                     (1,156)us-gaap_ImpairmentOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Net changes in unrealized gains (losses) on investments:                 17,300rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
64,305rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
16,212rli_UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Other                      
INVESTMENTS                      
Net realized investment gains (losses), excluding OTTI                 $ (1,245)us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= rli_OtherInvestmentMember
$ (844)us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= rli_OtherInvestmentMember
$ (2,929)us-gaap_RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments
/ us-gaap_InvestmentTypeAxis
= rli_OtherInvestmentMember