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ACQUISITION (Details) (USD $)
0 Months Ended 3 Months Ended
Mar. 04, 2015
Feb. 05, 2014
Mar. 31, 2015
subsidiary
state
Mar. 31, 2014
Mar. 04, 2015
Business acquisition          
Amount of investment     $ 1,711,000us-gaap_PaymentsToAcquireEquityMethodInvestments $ 5,301,000us-gaap_PaymentsToAcquireEquityMethodInvestments  
Equity in earnings of unconsolidated investees     4,194,000us-gaap_IncomeLossFromEquityMethodInvestments 3,425,000us-gaap_IncomeLossFromEquityMethodInvestments  
Prime Holdings Insurance Services, Inc. (Prime) [Member]          
Business acquisition          
Amount of investment 1,700,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
5,300,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
     
Equity ownership interest (as a percent) 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
    27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
Number of states in which entity operates     49us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
   
Equity in earnings of unconsolidated investees     500,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
100,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
 
Percentage of quota share reinsurance treaty, effective January 1, 2014     25.00%rli_ReinsuranceTreatyQuotaShareAsPercent
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
   
Number of insurance subsidiaries     2rli_NumberOfInsuranceSubsidiariesInWhichEntityOperates
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
   
Reinsurance assumed     $ 3,000,000us-gaap_AssumedPremiumsWritten
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember
$ 2,500,000us-gaap_AssumedPremiumsWritten
/ us-gaap_BusinessAcquisitionAxis
= rli_PrimeHoldingsInsuranceServicesIncPrimeMember