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OPERATING SEGMENT INFORMATION (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
Revenue by major product                      
Net premiums earned $ 179,892us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 177,747us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 168,604us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 161,132us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 168,396us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 163,702us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 154,553us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 144,151us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 687,375us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 630,802us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 576,571us-gaap_PremiumsEarnedNetPropertyAndCasualty
Casualty segment                      
Revenue by major product                      
Net premiums earned                 382,105us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 324,022us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 267,697us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Commercial and personal umbrella                      
Revenue by major product                      
Net premiums earned                 100,420us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialAndPersonalLinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 85,532us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialAndPersonalLinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 68,287us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialAndPersonalLinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | General liability                      
Revenue by major product                      
Net premiums earned                 80,820us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_GeneralLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 81,427us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_GeneralLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 84,985us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_GeneralLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Commercial transportation                      
Revenue by major product                      
Net premiums earned                 58,911us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialTransportationMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 50,287us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialTransportationMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 34,701us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialTransportationMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Professional services                      
Revenue by major product                      
Net premiums earned                 58,327us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ProfessionalServicesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 42,063us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ProfessionalServicesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 28,018us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ProfessionalServicesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | P&C package business                      
Revenue by major product                      
Net premiums earned                 35,371us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PAndCPackageBusinessMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 30,603us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PAndCPackageBusinessMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 28,497us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PAndCPackageBusinessMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Executive products                      
Revenue by major product                      
Net premiums earned                 18,915us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ExecutiveProductsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 19,123us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ExecutiveProductsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 17,198us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ExecutiveProductsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Medical professional liability                      
Revenue by major product                      
Net premiums earned                 15,943us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_ProfessionalMalpracticeLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 8,626us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_ProfessionalMalpracticeLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 25us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_ProfessionalMalpracticeLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Other casualty                      
Revenue by major product                      
Net premiums earned                 13,398us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OtherCasualtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 6,361us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OtherCasualtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 5,986us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OtherCasualtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Property segment                      
Revenue by major product                      
Net premiums earned                 197,776us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 200,141us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 202,402us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Commercial products                      
Revenue by major product                      
Net premiums earned                 80,719us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 76,939us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 74,197us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Marine                      
Revenue by major product                      
Net premiums earned                 49,235us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MarineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 57,122us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MarineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 56,367us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MarineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Crop reinsurance business                      
Revenue by major product                      
Net premiums earned                 28,293us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CropReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 31,421us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CropReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 24,506us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CropReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Specialty Personal                      
Revenue by major product                      
Net premiums earned                 26,627us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_SpecialtyPersonalMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 16,308us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_SpecialtyPersonalMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 12,022us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_SpecialtyPersonalMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Property reinsurance                      
Revenue by major product                      
Net premiums earned                 12,756us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PropertyReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 15,770us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PropertyReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 27,021us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PropertyReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Other property                      
Revenue by major product                      
Net premiums earned                 146us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 2,581us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 8,289us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Surety segment                      
Revenue by major product                      
Net premiums earned                 107,494us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 106,639us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 106,472us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Miscellaneous                      
Revenue by major product                      
Net premiums earned                 39,026us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MiscellaneousMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 38,131us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MiscellaneousMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 39,299us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MiscellaneousMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Contract                      
Revenue by major product                      
Net premiums earned                 26,592us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ContractMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 27,176us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ContractMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 26,329us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ContractMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Commercial                      
Revenue by major product                      
Net premiums earned                 25,778us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 23,133us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 22,107us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Oil and Gas                      
Revenue by major product                      
Net premiums earned                 $ 16,098us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OilAndGasMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 $ 18,199us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OilAndGasMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 $ 18,737us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OilAndGasMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember