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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