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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Insurance [Abstract]    
DPAC, beginning of period $ 54,603uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross $ 54,099uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross
Capitalized Costs 28,567uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsCapitalizedCostsGross 26,782uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsCapitalizedCostsGross
Amortization of DPAC (26,987)uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsAmortizationExpenseGross (26,670)uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsAmortizationExpenseGross
DPAC, end of period 56,183uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross 54,211uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross
DRCC, beginning of period 28,943uve_DeferredReinsuranceCedingCommissionsNet 38,200uve_DeferredReinsuranceCedingCommissionsNet
Ceding Commissions Written 17,661uve_DeferredReinsuranceCedingCommissionsCedingCommissionsWritten 21,880uve_DeferredReinsuranceCedingCommissionsCedingCommissionsWritten
Earned Ceding Commissions (16,616)uve_DeferredReinsuranceCedingCommissionsEarnedCedingCommissions (21,762)uve_DeferredReinsuranceCedingCommissionsEarnedCedingCommissions
DRCC, end of period 29,988uve_DeferredReinsuranceCedingCommissionsNet 38,318uve_DeferredReinsuranceCedingCommissionsNet
DPAC (DRCC), net, beginning of period 25,660us-gaap_DeferredPolicyAcquisitionCosts 15,899us-gaap_DeferredPolicyAcquisitionCosts
Capitalized Costs, net 10,906us-gaap_DeferredPolicyAcquisitionCostsAdditions 4,902us-gaap_DeferredPolicyAcquisitionCostsAdditions
Amortization of DPAC (DRCC), net (10,371)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense (4,908)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
DPAC (DRCC), net, end of period $ 26,195us-gaap_DeferredPolicyAcquisitionCosts $ 15,893us-gaap_DeferredPolicyAcquisitionCosts