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STOCK BASED COMPENSATION (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Y
Sep. 30, 2010
Y
Sep. 30, 2011
Y
Sep. 30, 2010
Y
Stock based compensation    
Stock options granted (in shares)  254,450203,200
Award vesting period (in years)  five years 
Term of options (in years)  eight years  
Term of options granted prior to 2009 (in years)  ten years 
Age and period of service of the participant to be eligible for retirement (in years)  75 
Number of Options Outstanding    
Options outstanding at the beginning of the period (in shares)  1,524,9821,583,803
Options granted (in shares)  254,450203,200
Options exercised (in shares)  (422,457)(218,645)
Options canceled / forfeited (in shares)  (24,350)(42,864)
Options outstanding at the end of the period (in shares)1,332,6251,525,4941,332,6251,525,494
Options exercisable at the end of the period (in shares)628,725841,473628,725841,473
Weighted Average Exercise Price    
Options outstanding at the beginning of the period (in dollars per share)  $ 41.32$ 44.73
Options granted (in dollars per share)$ 58.97$ 55.95$ 58.97$ 55.95
Options exercised (in dollars per share)$ 33.34$ 32.91$ 33.34$ 32.91
Options canceled/forfeited (in dollars per share)$ 45.84$ 46.78$ 45.84$ 46.78
Options outstanding at the end of the period (in dollars per share)$ 47.14$ 47.87$ 47.14$ 47.87
Exercisable options at the end of the period (in dollars per share)$ 43.62$ 44.30$ 43.62$ 44.30
Weighted Average Remaining Contractual Life    
Weighted-average remaining contractual term of options outstanding (in years)5.965.975.965.97
Weighted-average remaining contractual term of exercisable options (in years)  5.075.02
Aggregate Intrinsic Value    
Options exercised (in dollars)  $ 11,220,000$ 4,914,000
Options outstanding at the end of the period (in dollars)21,910,00013,353,00021,910,00013,353,000
Exercisable options at the end of the period (in dollars)12,551,00010,370,00012,551,00010,370,000
Average fair value of options granted (in dollars per share)  $ 12.97$ 13.37
Stock-based compensation expenses (in dollars)1,000,000700,0002,600,0002,300,000
Income tax benefit from stock-based compensation (In dollars)300,000200,000900,000800,000
Unrecognized stock-based compensation expense (in dollars)$ 4,000,000 $ 4,000,000 
Weighted average grant date assumptions and weighted average fair value    
Weighted-average fair value of grants (in dollars per share)  $ 12.97$ 13.37
Risk-free interest rates (as a percent)  2.22%2.68%
Dividend yield (as a percent)  1.89%1.74%
Expected volatility (as a percent)  25.67%25.91%
Expected option life (in years)  5.505.57
Period for which annualized dividends is considered to calculate dividend yield (in years)  5 
Period for which volatility is considered to calculate the expected volatility (in years)  1 
Omnibus Stock Plan
    
Stock based compensation    
Shares authorized for grant1,500,000 1,500,000 
Stock options granted to date (in shares)  1,227,445 
RLI Corp. Long-Term Incentive Plan (LTIP)
    
Stock based compensation    
Shares authorized for grant2,000,000 2,000,000 
Stock options granted (in shares)  254,450 
Stock options granted to date (in shares)  461,500 
Number of Options Outstanding    
Options granted (in shares)  254,450