XML 67 R64.htm IDEA: XBRL DOCUMENT v2.4.0.6

Commitments and Contingencies (Narrative) (Details) (Other Investments [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Other Investments [Member]
Remaining Commitment	$ 56,351

X

- Definition

This item represents contractual obligations to invest additional amounts on our other investment portfolio. These additional investments may or may not be required.

+ References

No definition available.

+ Details

Name:	sigi_RemainingCommitment
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant