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Reinsurance (Total Reinsurance Balances Segregated By Reinsurer) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 NJ Unsatisfied Claim Judgment Fund [Member] | Dec. 31, 2011 NJ Unsatisfied Claim Judgment Fund [Member] | Dec. 31, 2012 National Flood Insurance Program [Member] | Dec. 31, 2011 National Flood Insurance Program [Member] | Dec. 31, 2012 Other Federal And State Pools [Member] | Dec. 31, 2011 Other Federal And State Pools [Member] | Dec. 31, 2012 Total Federal And State Pools [Member] | Dec. 31, 2011 Total Federal And State Pools [Member] | Dec. 31, 2012 Remaining Unsecured Reinsurance [Member] | Dec. 31, 2011 Remaining Unsecured Reinsurance [Member] | Dec. 31, 2012 Hanover Ruckversicherungs AG [Member] | Dec. 31, 2011 Hanover Ruckversicherungs AG [Member] | Dec. 31, 2012 Munich Re Group [Member] | Dec. 31, 2011 Munich Re Group [Member] | Dec. 31, 2012 Swiss Re Group [Member] | Dec. 31, 2011 Swiss Re Group [Member] | Dec. 31, 2012 AXIS Reinsurance Company [Member] | Dec. 31, 2011 AXIS Reinsurance Company [Member] | Dec. 31, 2012 Partner Reinsurance Company Of The US [Member] | Dec. 31, 2011 Partner Reinsurance Company Of The US [Member] | Dec. 31, 2012 All Other Reinsurers [Member] | Dec. 31, 2011 All Other Reinsurers [Member] | Dec. 31, 2012 Allowance for Reinsurance Recoverable [Member] | Dec. 31, 2011 Allowance for Reinsurance Recoverable [Member] | Feb. 15, 2013 Hurricane Sandy [Member] National Flood Insurance Program [Member] | Dec. 31, 2012 Hurricane Sandy [Member] National Flood Insurance Program [Member] | Feb. 15, 2013 Hurricane Sandy [Member] Catatrophe excess of loss treaty [Member] | Dec. 31, 2012 Hurricane Sandy [Member] Catatrophe excess of loss treaty [Member]
Allowance For Reinsurance Recoverable | $ 8,706 |  | $ 7,668 |  | $ 8,091 | $ 8,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,800 | $ 3,900 |  |  |  |
Reinsurance recoverable, net | 1,421,109 |  | 561,855 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 621,100 | 839,100 | 29,900 | 68,400
Total prepaid reinsurance premiums | 132,637 |  | 147,686 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: collateral | (139,335) | [1] | (146,364) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unsecured reinsurance balances | $ 1,414,411 |  | $ 563,177 |  |  |  | $ 68,655 | [2] | $ 69,179 | [2] | $ 1,028,685 | [2] | $ 267,600 | [2] | $ 5,749 | [2] | $ 4,235 | [2] | $ 1,103,089 | [2] | $ 341,014 | [2] | $ 311,322 | $ 222,163 | $ 60,358 | $ 50,718 | $ 66,283 | $ 42,064 | $ 52,189 | $ 30,330 | $ 35,064 | $ 26,172 | $ 20,074 | $ 19,105 | $ 77,354 | $ 53,774 |  |  |  |  |  |
% of unpaid NFIP claims ceded by federal government | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% of Net Unsecured Reinsurance |  |  |  |  |  |  | 5.00% | [2] | 12.00% | [2] | 73.00% | [2] | 48.00% | [2] | 0.00% | [2] | 1.00% | [2] | 78.00% | [2] | 61.00% | [2] | 22.00% | 39.00% | 4.00% | 9.00% | 5.00% | 7.00% | 4.00% | 5.00% | 3.00% | 5.00% | 1.00% | 3.00% | 5.00% | 10.00% |  |  |  |  |  |
[1] | 1 Includes letters of credit, trust funds, and funds withheld.
[2] | 2 Considered to have minimal risk of default.

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 Percentage of unpaid NFIP claims ceded by federal government + References No definition available. + Details
Name: | sigi_PercentageOfUnpaidNfipClaimsCededByFederalGovernment
Namespace Prefix: | sigi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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 Accounting Standards Codification -Glossary Prepaid Reinsurance Premiums -URI http://asc.fasb.org/extlink&oid=6521719 Reference 2: 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 Reference 3: 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. + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 3: 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 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.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_ReinsuranceRecoverables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant