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Commitments and Contingencies (Narrative) (Details) (Other Investments [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Other Investments [Member]
Remaining Commitment	$ 64,846

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