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OPERATING SEGMENT INFORMATION Major Products (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue by major product    
Net premiums earned $ 169,003us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 161,132us-gaap_PremiumsEarnedNetPropertyAndCasualty
Casualty segment    
Revenue by major product    
Net premiums earned 98,768us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 90,977us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Commercial and personal umbrella    
Revenue by major product    
Net premiums earned 25,297us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialAndPersonalLinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 24,756us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialAndPersonalLinesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | General liability    
Revenue by major product    
Net premiums earned 19,972us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_GeneralLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 19,932us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_GeneralLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Commercial transportation    
Revenue by major product    
Net premiums earned 14,681us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialTransportationMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 14,511us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialTransportationMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Professional services    
Revenue by major product    
Net premiums earned 17,080us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ProfessionalServicesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 12,861us-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 9,649us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PAndCPackageBusinessMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 8,283us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PAndCPackageBusinessMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Executive products    
Revenue by major product    
Net premiums earned 4,685us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ExecutiveProductsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 4,684us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ExecutiveProductsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Medical professional liability    
Revenue by major product    
Net premiums earned 3,104us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_ProfessionalMalpracticeLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 3,700us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_ProfessionalMalpracticeLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Casualty segment | Other casualty    
Revenue by major product    
Net premiums earned 4,300us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OtherCasualtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember		 2,250us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OtherCasualtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Property segment    
Revenue by major product    
Net premiums earned 42,118us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 43,318us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Commercial property    
Revenue by major product    
Net premiums earned 19,903us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 20,433us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Marine    
Revenue by major product    
Net premiums earned 11,917us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MarineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 12,201us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MarineMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Crop reinsurance    
Revenue by major product    
Net premiums earned 465us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CropReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 1,186us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CropReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Specialty Personal    
Revenue by major product    
Net premiums earned 6,790us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_SpecialtyPersonalMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 6,108us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_SpecialtyPersonalMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Property reinsurance    
Revenue by major product    
Net premiums earned 3,017us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PropertyReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 3,361us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_PropertyReinsuranceMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Property segment | Other property    
Revenue by major product    
Net premiums earned 26us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember		 29us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Surety segment    
Revenue by major product    
Net premiums earned 28,117us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 26,837us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Miscellaneous    
Revenue by major product    
Net premiums earned 10,168us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MiscellaneousMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 9,482us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_MiscellaneousMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Contract    
Revenue by major product    
Net premiums earned 6,830us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ContractMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 6,761us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_ContractMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
Surety segment | Commercial    
Revenue by major product    
Net premiums earned 6,901us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_CommercialMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 6,134us-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 $ 4,218us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OilAndGasMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember		 $ 4,460us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ProductOrServiceAxis
= rli_OilAndGasMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember