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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Net premiums earned	$ 476,123us-gaap_PremiumsEarnedNetPropertyAndCasualty	$ 456,495us-gaap_PremiumsEarnedNetPropertyAndCasualty
Net investment income earned	26,917us-gaap_NetInvestmentIncome	35,534us-gaap_NetInvestmentIncome
Net realized gains:
Net realized investment gains	20,977us-gaap_GainLossOnSaleOfSecuritiesNet	8,181us-gaap_GainLossOnSaleOfSecuritiesNet
Other-than-temporary impairments	(2,094)us-gaap_ImpairmentOfInvestments	(963)us-gaap_ImpairmentOfInvestments
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest
Total net realized gains	18,883us-gaap_RealizedInvestmentGainsLosses	7,218us-gaap_RealizedInvestmentGainsLosses
Other income	1,969us-gaap_OtherIncome	9,824us-gaap_OtherIncome
Total revenues	523,892us-gaap_Revenues	509,071us-gaap_Revenues
Expenses:
Loss and loss expense incurred	284,999us-gaap_IncurredClaimsPropertyCasualtyAndLiability	320,546us-gaap_IncurredClaimsPropertyCasualtyAndLiability
Policy acquisition costs	164,723sigi_PolicyAcquisitionCosts	149,266sigi_PolicyAcquisitionCosts
Interest expense	5,479us-gaap_InterestExpenseDebt	5,561us-gaap_InterestExpenseDebt
Other expenses	12,401us-gaap_OtherCostAndExpenseOperating	8,614us-gaap_OtherCostAndExpenseOperating
Total expenses	467,602us-gaap_BenefitsLossesAndExpenses	483,987us-gaap_BenefitsLossesAndExpenses
Income before federal income tax	56,290us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25,084us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Federal income tax expense:
Current	12,254us-gaap_CurrentFederalTaxExpenseBenefit	6,538us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	4,328us-gaap_DeferredFederalIncomeTaxExpenseBenefit	572us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total federal income tax expense	16,582us-gaap_IncomeTaxExpenseBenefit	7,110us-gaap_IncomeTaxExpenseBenefit
Net income	$ 39,708us-gaap_NetIncomeLoss	$ 17,974us-gaap_NetIncomeLoss
Earnings per share:
Basic net income	$ 0.70us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic
Diluted net income	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted
Dividends to stockholders	$ 0.14us-gaap_CommonStockDividendsPerShareDeclared	$ 0.13us-gaap_CommonStockDividendsPerShareDeclared

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