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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Carrying Value	$ 106,548	$ 107,875
Other Investments [Member]
Carrying Value	106,548	107,875
Remaining Commitment	50,309
Alternative Investments [Member]
Carrying Value	100,097	106,211
Remaining Commitment	50,309
Secondary Private Equity Member | Alternative Investments [Member]
Carrying Value	23,064	25,618
Remaining Commitment	6,978
Private Equity [Member] | Alternative Investments [Member]
Carrying Value	21,569	20,192
Remaining Commitment	9,181
Energy Power Generation [Member] | Alternative Investments [Member]
Carrying Value	16,659	17,361
Remaining Commitment	6,984
Mezzanine Financing [Member] | Alternative Investments [Member]
Carrying Value	11,273	12,738
Remaining Commitment	13,774
Real estate [Member] | Alternative Investments [Member]
Carrying Value	11,212	11,698
Remaining Commitment	10,061
Distressed debt [Member] | Alternative Investments [Member]
Carrying Value	9,205	11,579
Remaining Commitment	2,981
Venture Capital [Member] | Alternative Investments [Member]
Carrying Value	7,115	7,025
Remaining Commitment	350
Other Securities [Member]
Carrying Value	6,451	1,664
Remaining Commitment	$ 0

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

X

- Definition

Other investments not otherwise specified in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 12

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f,g))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_OtherInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant