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Reinsurance (Total Reinsurance Balances Segregated By Reinsurer) (Details) (USD $)	Dec. 31, 2011		Dec. 31, 2010
Allowance For Reinsurance Recoverable	$ 3,900,000		$ 3,400,000
Total Reinsurance recoverables	561,855,000		318,752,000
Total prepaid reinsurance premiums	147,686,000		110,327,000
Less: collateral	(146,364,000)	[1]	(81,707,000)	[1]
Net unsecured reinsurance balances	563,177,000		347,372,000
NJ Unsatisfied Claim Judgment Fund [Member]
Net unsecured reinsurance balances	69,179,000		62,098,000
% of Net Unsecured Reinsurance	12.00%		18.00%
National Flood Insurance Program [Member]
Net unsecured reinsurance balances	267,600,000		119,241,000
% of Net Unsecured Reinsurance	48.00%		34.00%
Other Federal And State Pools [Member]
Net unsecured reinsurance balances	4,235,000		5,157,000
% of Net Unsecured Reinsurance	1.00%		2.00%
Total Federal And State Pools [Member]
Net unsecured reinsurance balances	341,014,000		186,496,000
% of Net Unsecured Reinsurance	61.00%		54.00%
Remaining Unsecured Reinsurance [Member]
Net unsecured reinsurance balances	222,163,000		160,876,000
% of Net Unsecured Reinsurance	39.00%		46.00%
Hanover Ruckversicherungs AG [Member]
Net unsecured reinsurance balances	50,636,000		33,203,000
% of Net Unsecured Reinsurance	9.00%		10.00%
Munich Re Group [Member]
Net unsecured reinsurance balances	34,902,000		29,312,000
% of Net Unsecured Reinsurance	6.00%		8.00%
Swiss Re Group [Member]
Net unsecured reinsurance balances	28,634,000		24,552,000
% of Net Unsecured Reinsurance	5.00%		7.00%
AXIS Reinsurance Company [Member]
Net unsecured reinsurance balances	26,172,000		15,665,000
% of Net Unsecured Reinsurance	5.00%		5.00%
Partner Reinsurance Company Of The US [Member]
Net unsecured reinsurance balances	19,105,000		14,206,000
% of Net Unsecured Reinsurance	3.00%		4.00%
All Other Reinsurers [Member]
Net unsecured reinsurance balances	$ 62,714,000		$ 43,938,000
% of Net Unsecured Reinsurance	11.00%		12.00%
[1] 1 Includes letters of credit, trust funds, and funds withheld.

X

- Definition

A valuation allowance for the uncollectible amount of an insurance receivable related to a policy by which an insurer indemnifies itself of some or all of the risk associated with a reinsurance policy.

+ References

No definition available.

+ Details

Name:	sigi_AllowanceForReinsuranceRecoverable
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the amount collateralized by the entity's reinsurers. The amount includes letters of credit, trust funds, and funds withheld.

+ References

No definition available.

+ Details

Name:	sigi_CollateralOfReinsuranceRecoverables
Namespace Prefix:	sigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the known and estimated amount of reinsurance recoverables and the unexpired portion of premiums ceded on policies in force, less the collateral related to reinsurance recoverables, as of the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the percentage of the total net unsecured reinsurance balance.

+ References

No definition available.

+ Details

Name:	sigi_PercentageOfNetUnsecuredReinsurance
Namespace Prefix:	sigi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The unexpired portion of premiums ceded on policies in force as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 113

-Paragraph 14, 27, 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Prepaid Reinsurance Premiums

-URI http://asc.fasb.org/extlink&oid=6521719



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 340

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507

+ Details

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

X

- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

+ References

Reference 1: 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.(a),6)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 6



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 113

-Paragraph 14, 16, 27, 113

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387

+ Details

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