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INVESTMENTS (Details 8) - 10K (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
security
position
Dec. 31, 2013
Fixed income securities in unrealized loss positions      
Total unrealized loss   $ 7,119,000rli_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments $ 28,933,000rli_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
Other-than-temporary impairment (OTTI) losses recognized in other comprehensive earnings 1,156,000us-gaap_ImpairmentOfInvestments    
Unrealized losses for 12 consecutive months or longer   1,655,000rli_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments 238,000rli_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
Fixed maturities and short-term investments on deposit with either regulatory authorities or banks   28,100,000us-gaap_RestrictedInvestments  
Debt securities      
Fixed income securities in unrealized loss positions      
Number of unrealized loss positions   258rli_InvestmentContinuousUnrealizedLossPositionNumber
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
 
Number of securities in unrealized loss positions for 12 months or longer   49rli_InvestmentContinuousUnrealizedLossPositionTwelveMonthsOrLongerNumber
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
 
Maximum period for securities with unrealized losses greater than 20 percent   12 months  
Unrealized losses for 12 consecutive months or longer   1,700,000rli_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
 
Common Stock      
Fixed income securities in unrealized loss positions      
Number of unrealized loss positions   4rli_InvestmentContinuousUnrealizedLossPositionNumber
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommonStockMember
 
Total unrealized loss   1,000,000rli_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommonStockMember
 
Number of securities in unrealized loss positions of greater than 20 percent   0rli_InvestmentContinuousUnrealizedLossPositionOfGreaterThanTwentyPercentNumber
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommonStockMember
 
Maximum period for securities with unrealized losses greater than 20 percent   6 months  
Common Stock | Maximum      
Fixed income securities in unrealized loss positions      
Maximum percentage of unrealized loss to portfolio for more than six consecutive months   20.00%rli_InvestmentContinuousUnrealizedLossPositionUnrealizedLossesAsPercentOfCostMaximum
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Equity securities      
Fixed income securities in unrealized loss positions      
Other-than-temporary impairment (OTTI) losses recognized in other comprehensive earnings $ 1,156,000us-gaap_ImpairmentOfInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember