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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Reinsurance Disclosures [Abstract] |  |  |  |
Prepaid reinsurance premiums | $ 190,505us-gaap_PrepaidReinsurancePremiums | $ 241,214us-gaap_PrepaidReinsurancePremiums |  |
Reinsurance recoverable on unpaid losses and LAE | 47,350us-gaap_ReinsuranceRecoverablesOnUnpaidLosses | 68,584us-gaap_ReinsuranceRecoverablesOnUnpaidLosses | 81,415us-gaap_ReinsuranceRecoverablesOnUnpaidLosses | 88,002us-gaap_ReinsuranceRecoverablesOnUnpaidLosses
Reinsurance recoverable on paid losses | 7,837us-gaap_ReinsuranceRecoverablesOnPaidLosses | 39,263us-gaap_ReinsuranceRecoverablesOnPaidLosses |  |
Reinsurance receivable, net | 7,468us-gaap_ReinsuranceReceivablesPaidLossesRecoverable | 203us-gaap_ReinsuranceReceivablesPaidLossesRecoverable |  |
Reinsurance recoverable and receivable | $ 62,655uve_ReinsuranceRecoverablesAndReceivables | $ 108,050uve_ReinsuranceRecoverablesAndReceivables |  |

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- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prepaid Reinsurance Premiums -URI http://asc.fasb.org/extlink&oid=6521719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
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- Definition Amount after valuation allowance currently billed or billable under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables on paid losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all reinsurance recoverables and receivables. + References No definition available. + Details
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