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OPERATING SEGMENT INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
REVENUES    
Segment totals before income taxes $ 169,003us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 161,132us-gaap_PremiumsEarnedNetPropertyAndCasualty
Net investment income 13,495us-gaap_NetInvestmentIncome 13,582us-gaap_NetInvestmentIncome
Net realized gains 13,286us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 6,501us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
Consolidated revenue 195,784us-gaap_Revenues 181,215us-gaap_Revenues
NET EARNINGS (LOSSES)    
Net underwriting income 17,638us-gaap_UnderwritingIncomeLoss 22,532us-gaap_UnderwritingIncomeLoss
Net investment income 13,495us-gaap_NetInvestmentIncome 13,582us-gaap_NetInvestmentIncome
Net realized gains 13,286us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments 6,501us-gaap_RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
General corporate expense and interest on debt (4,100)rli_OtherGeneralAndInterestExpenses (4,049)rli_OtherGeneralAndInterestExpenses
Equity in earnings of unconsolidated investees 4,194us-gaap_IncomeLossFromEquityMethodInvestments 3,425us-gaap_IncomeLossFromEquityMethodInvestments
Earnings before income taxes 44,513us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 41,991us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense 13,915us-gaap_IncomeTaxExpenseBenefit 13,022us-gaap_IncomeTaxExpenseBenefit
Net earnings 30,598us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 28,969us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Casualty segment    
REVENUES    
Segment totals before income taxes 98,768us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
90,977us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
NET EARNINGS (LOSSES)    
Net underwriting income 5,272us-gaap_UnderwritingIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
6,078us-gaap_UnderwritingIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rli_CasualtySegmentMember
Property segment    
REVENUES    
Segment totals before income taxes 42,118us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
43,318us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
NET EARNINGS (LOSSES)    
Net underwriting income 8,176us-gaap_UnderwritingIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
9,678us-gaap_UnderwritingIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PropertyInsuranceProductLineMember
Surety segment    
REVENUES    
Segment totals before income taxes 28,117us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
26,837us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
NET EARNINGS (LOSSES)    
Net underwriting income $ 4,190us-gaap_UnderwritingIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember
$ 6,776us-gaap_UnderwritingIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_SuretySegmentMember