Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for capital and operating leases having initial or remaining noncancelable lease terms in excess of one year.

No definition available.

Name:	rli_ScheduleOfFutureMinimumLeasePaymentsForCapitalAndOperatingLeasesTableTextBlock
Namespace Prefix:	rli_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration