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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Insurance [Abstract] |  |  |
DPAC, beginning of year | $ 54,099uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross | $ 54,431uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross | $ 50,200uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross
Capitalized Costs | 108,072uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsCapitalizedCostsGross | 109,981uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsCapitalizedCostsGross | 107,180uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsCapitalizedCostsGross
Amortization of DPAC | (107,568)uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsAmortizationExpenseGross | (110,313)uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsAmortizationExpenseGross | (102,949)uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsAmortizationExpenseGross
DPAC, end of year | 54,603uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross | 54,099uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross | 54,431uve_DeferredPolicyAcquisitionCostsAndDeferredReinsuranceCedingCommissionsGross
DRCC, beginning of year | 38,200uve_DeferredReinsuranceCedingCommissionsNet | 37,149uve_DeferredReinsuranceCedingCommissionsNet | 38,845uve_DeferredReinsuranceCedingCommissionsNet
Ceding Commissions Written | 64,810uve_DeferredReinsuranceCedingCommissionsCedingCommissionsWritten | 89,679uve_DeferredReinsuranceCedingCommissionsCedingCommissionsWritten | 85,063uve_DeferredReinsuranceCedingCommissionsCedingCommissionsWritten
Earned Ceding Commissions | (74,067)uve_DeferredReinsuranceCedingCommissionsEarnedCedingCommissions | (88,628)uve_DeferredReinsuranceCedingCommissionsEarnedCedingCommissions | (86,759)uve_DeferredReinsuranceCedingCommissionsEarnedCedingCommissions
DRCC, end of year | 28,943uve_DeferredReinsuranceCedingCommissionsNet | 38,200uve_DeferredReinsuranceCedingCommissionsNet | 37,149uve_DeferredReinsuranceCedingCommissionsNet
DPAC (DRCC), net, beginning of year | 15,899us-gaap_DeferredPolicyAcquisitionCosts | 17,282us-gaap_DeferredPolicyAcquisitionCosts | 11,355us-gaap_DeferredPolicyAcquisitionCosts
Capitalized Costs, net | 43,262us-gaap_DeferredPolicyAcquisitionCostsAdditions | 20,302us-gaap_DeferredPolicyAcquisitionCostsAdditions | 22,117us-gaap_DeferredPolicyAcquisitionCostsAdditions
Amortization of DPAC (DRCC), net | (33,501)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | (21,685)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | (16,190)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
DPAC (DRCC), net, end of year | $ 25,660us-gaap_DeferredPolicyAcquisitionCosts | $ 15,899us-gaap_DeferredPolicyAcquisitionCosts | $ 17,282us-gaap_DeferredPolicyAcquisitionCosts

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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755678&loc=d3e11446-158418 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 + Details
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- Definition Total amount of policy acquisition costs capitalized during the income statement period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition Amount of amortization expense during the income statement period related to deferred policy acquisition costs and deferred reinsurance ceded commissions. + References No definition available. + Details
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- Definition Amount of policy acquisition costs and deferred reinsurance ceded commissions capitalized during the income statement period. + References No definition available. + Details
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- Definition Gross amount of deferred policy acquisition costs and deferred reinsurance ceded commissions capitalized on contracts remaining in force as of the balance sheet date. + References No definition available. + Details
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