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Deferred Policy Acquisition Costs (Components Of Underwriting, Acquisition And Insurance Expenses) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Policy Acquisition Costs Disclosures [Abstract]      
Transaction costs and other acquisition-related expenses $ 0mkl_UnderwritingAcquisitionAndInsuranceExpensesTransactionCostsAndOtherAcquisitionRelatedExpenses [1] $ 75,140mkl_UnderwritingAcquisitionAndInsuranceExpensesTransactionCostsAndOtherAcquisitionRelatedExpenses [1],[2] $ 0mkl_UnderwritingAcquisitionAndInsuranceExpensesTransactionCostsAndOtherAcquisitionRelatedExpenses [1]
Transaction costs   15,981us-gaap_BusinessCombinationAcquisitionRelatedCosts [1]  
Other acquisition related costs, severance costs   31,734mkl_BusinessCombinationSeveranceCosts [1]  
Other acquisition related costs, stay bonuses   14,804mkl_BusinessCombinationStayBonusCosts [1]  
Other acquisition related costs, other compensation costs   12,621us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost [1]  
Prospective adoption of FASB ASU No. 2010-26 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification [3] 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification [3] 43,093us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification [3]
Other amortization of policy acquisition costs 654,916mkl_DeferredPolicyAcquisitionCostsOtherAmortizationExpense 471,915mkl_DeferredPolicyAcquisitionCostsOtherAmortizationExpense 385,016mkl_DeferredPolicyAcquisitionCostsOtherAmortizationExpense
Other operating expenses 805,966us-gaap_OtherUnderwritingExpense 765,257us-gaap_OtherUnderwritingExpense 501,363us-gaap_OtherUnderwritingExpense
Underwriting, acquisition and insurance expenses $ 1,460,882mkl_UnderwritingAcquisitionAndInsuranceExpenses $ 1,312,312mkl_UnderwritingAcquisitionAndInsuranceExpenses $ 929,472mkl_UnderwritingAcquisitionAndInsuranceExpenses
[1] In connection with the acquisition of Alterra, the Company incurred transaction costs of $16.0 million for the year ended December 31, 2013, which primarily consist of due diligence, legal and investment banking costs. Additionally, the Company incurred severance costs of $31.7 million, stay bonuses of $14.8 million and other compensation costs totaling $12.6 million related to the acceleration of certain long-term incentive compensation awards and restricted stock awards that were granted by Alterra prior to the acquisition.
[2] In connection with the acquisition of Alterra, the Company incurred transaction costs of $16.0 million for the year ended December 31, 2013, which primarily consist of due diligence, legal and investment banking costs. Additionally, the Company incurred severance costs of $31.7 million, stay bonuses of $14.8 million and other compensation costs totaling $12.6 million related to the acceleration of certain long-term incentive compensation awards and restricted stock awards that were granted by Alterra prior to the acquisition.
[3] Effective January 1, 2012, the Company prospectively adopted FASB ASU No. 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts. At December 31, 2011, deferred policy acquisition costs included $43.1 million of costs that no longer met the criteria for deferral as of January 1, 2012 and were recognized into income during 2012, consistent with policy terms.