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Reinsurance (Total Reinsurance Balances Segregated By Reinsurer) (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Allowance For Reinsurance Recoverable | $ 9,542,000 |  | $ 8,706,000 |  | $ 7,668,000 | $ 8,091,000
Total reinsurance recoverables | 550,897,000 |  | 1,421,109,000 |  |  |
Total prepaid reinsurance premiums | 143,000,000 |  | 132,637,000 |  |  |
Less: collateral | (119,732,000) | [1] | (139,335,000) | [1] |  |
Net unsecured reinsurance balances | 574,165,000 |  | 1,414,411,000 |  |  |
National Flood Insurance Program [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 177,637,000 | [2] | 1,028,685,000 | [2] |  |
% of Net Unsecured Reinsurance | 31.00% | [2] | 73.00% | [2] |  |
NJ Unsatisfied Claim Judgment Fund [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 71,732,000 | [2] | 68,655,000 | [2] |  |
% of Net Unsecured Reinsurance | 12.00% | [2] | 5.00% | [2] |  |
Other Federal And State Pools [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 3,034,000 | [2] | 5,749,000 | [2] |  |
% of Net Unsecured Reinsurance | 1.00% | [2] | 0.00% | [2] |  |
Total Federal And State Pools [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 252,403,000 | [2] | 1,103,089,000 | [2] |  |
% of Net Unsecured Reinsurance | 44.00% | [2] | 78.00% | [2] |  |
Remaining Unsecured Reinsurance [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 321,762,000 |  | 311,322,000 |  |  |
% of Net Unsecured Reinsurance | 56.00% |  | 22.00% |  |  |
Hanover Ruckversicherungs AG [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 72,565,000 |  | 60,358,000 |  |  |
% of Net Unsecured Reinsurance | 13.00% |  | 4.00% |  |  |
Munich Re Group [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 69,749,000 |  | 66,283,000 |  |  |
% of Net Unsecured Reinsurance | 12.00% |  | 5.00% |  |  |
Swiss Re Group [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 48,234,000 |  | 52,189,000 |  |  |
% of Net Unsecured Reinsurance | 8.00% |  | 4.00% |  |  |
AXIS Reinsurance Company [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 45,114,000 |  | 35,064,000 |  |  |
% of Net Unsecured Reinsurance | 8.00% |  | 3.00% |  |  |
Partner Reinsurance Company Of The US [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 25,730,000 |  | 20,074,000 |  |  |
% of Net Unsecured Reinsurance | 4.00% |  | 1.00% |  |  |
QBE Reinsurance Corporation [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 15,665,000 |  | 13,871,000 |  |  |
% of Net Unsecured Reinsurance | 3.00% |  | 1.00% |  |  |
All Other Reinsurers [Member] |  |  |  |  |  |
Net unsecured reinsurance balances | 44,705,000 |  | 63,483,000 |  |  |
% of Net Unsecured Reinsurance | 8.00% |  | 4.00% |  |  |
Allowance for Reinsurance Recoverable [Member] |  |  |  |  |  |
Allowance For Reinsurance Recoverable | 5,100,000 |  | 4,800,000 |  |  |
Hurricane Sandy [Member] | National Flood Insurance Program [Member] |  |  |  |  |  |
Decrease of Reinsurance Recoverables | 809,600,000 |  |  |  |  |
Hurricane Sandy [Member] | Catatrophe excess of loss treaty [Member] |  |  |  |  |  |
Decrease of Reinsurance Recoverables | $ 55,800,000 |  |  |  |  |
[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 represents the drivers of the decrease in reinsurance recoverable balance. + References No definition available. + Details
Name: | sigi_DecreaseofReinsuranceRecoverables
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 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 No definition available. + Details
Name: | sigi_ReinsuranceRecoverablesnet
Namespace Prefix: | sigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 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 + Details
Name: | us-gaap_PrepaidReinsurancePremiums
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
Name: | us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant