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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 8) - 10K (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
California earthquake  
Catastrophe Exposures  
Catastrophe reinsurance $ 300rli_CatastropheReinsuranceAmount
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= rli_EarthquakeInCaliforniaMember
First-dollar retention 25rli_CatastropheReinsuranceFirstDollarRetention
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= rli_EarthquakeInCaliforniaMember
Non-California earthquake  
Catastrophe Exposures  
Catastrophe reinsurance 325rli_CatastropheReinsuranceAmount
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= rli_EarthquakeInNonCaliforniaMember
First-dollar retention 25rli_CatastropheReinsuranceFirstDollarRetention
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= rli_EarthquakeInNonCaliforniaMember
Other perils  
Catastrophe Exposures  
Catastrophe reinsurance 225rli_CatastropheReinsuranceAmount
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= rli_OtherPerilsMember
First-dollar retention $ 25rli_CatastropheReinsuranceFirstDollarRetention
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= rli_OtherPerilsMember