SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	0 Months Ended	12 Months Ended
	Jan. 15, 2014	Dec. 31, 2013 item
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of insurance companies through which the entity conducts operations		4
PRINCIPLES OF CONSOLIDATION AND BASIS OF PRESENTATION
Common stock split conversion ratio	2
RLI Ins.
DESCRIPTION OF BUSINESS
Number of states in which entity writes insurance		50
Mt. Hawley Insurance Company
DESCRIPTION OF BUSINESS
Number of states in which entity writes insurance		50
RIC
DESCRIPTION OF BUSINESS
Number of states in which entity writes insurance		48
Contractors Bonding and Insurance Company
DESCRIPTION OF BUSINESS
Number of states in which entity writes insurance		50