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Supplemental Financial Statement Information (Schedule of Other Operating Cost and Expense, by Component) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Income and Expenses [Abstract]      
Amortization of deferred policy acquisition costs $ 1,053,397us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense $ 991,070us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense $ 917,583us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Other underwriting expenses 843,133us-gaap_OtherUnderwritingExpense 780,058us-gaap_OtherUnderwritingExpense 675,163us-gaap_OtherUnderwritingExpense
Service company expenses 102,726wrb_ServiceCompanyExpenses 88,662wrb_ServiceCompanyExpenses 84,986wrb_ServiceCompanyExpenses
Net foreign currency gains (27)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (10,120)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (6,092)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other costs and expenses 158,227wrb_OtherCostsAndExpenseOperatingOther 151,014wrb_OtherCostsAndExpenseOperatingOther 127,983wrb_OtherCostsAndExpenseOperatingOther
Total $ 2,157,456us-gaap_OtherCostAndExpenseOperating $ 2,000,684us-gaap_OtherCostAndExpenseOperating $ 1,799,623us-gaap_OtherCostAndExpenseOperating