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Reserve of Losses and Loss Expenses (Rollforward of Reserves for Losses and Loss Expenses) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Gross reserves for losses and loss expenses, at beginning of year $ 3,349,770,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 4,068,941,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense $ 3,144,924,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Less: reinsurance recoverable on unpaid loss and loss expenses, at beginning of year 540,839,000us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 1,409,755,000us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 549,490,000us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Net reserves for losses and loss expenses, at beginning of year 2,808,931,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 2,659,186,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 2,595,434,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Incurred losses and loss expense for claims occurring in the current year 1,216,770,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 1,147,263,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense 1,146,591,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Incurred losses and loss expenses for claims occurring in the prior years (59,269,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (25,525,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense (25,601,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Total incurred losses and loss expenses 1,157,501,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 1,121,738,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 1,120,990,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Paid losses and loss expenses for claims occurring in current year 468,478,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 399,559,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 424,496,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Paid losses and loss expenses for claims occurring in prior years 592,062,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 572,434,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 632,742,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Total paid losses and loss expenses 1,060,540,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense 971,993,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense 1,057,238,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Net reserves for losses and loss expenses, at end of year 2,905,892,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 2,808,931,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet 2,659,186,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Add: reinsurance recoverable on unpaid loss and loss expenses, at end of year 571,978,000us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 540,839,000us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments 1,409,755,000us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Gross reserves for losses and loss expenses, at end of year 3,477,870,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense 3,349,770,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense 4,068,941,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Increase of net loss and loss expense reserves 97,000,000sigi_IncreaseDecreaseOfNetLossAndLossExpenseReserves 149,700,000sigi_IncreaseDecreaseOfNetLossAndLossExpenseReserves 63,800,000sigi_IncreaseDecreaseOfNetLossAndLossExpenseReserves
Anticipated recoveries for salvage and subrogation claims $ 65,100,000us-gaap_SalvageAndSubrogationRecoveriesValue $ 61,000,000us-gaap_SalvageAndSubrogationRecoveriesValue $ 62,200,000us-gaap_SalvageAndSubrogationRecoveriesValue