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Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Maximum maturity period of highly liquid investments |  | 3 months |  |  |
Allowances for doubtful accounts |  | $ 357,000us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts |  | $ 446,000us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts |
Accruals for premium deficiency |  | 0uve_PremiumDeficiencyAccruals |  | 0uve_PremiumDeficiencyAccruals |
Deferred policy acquisition costs |  | 25,660,000us-gaap_DeferredPolicyAcquisitionCosts | 11,355,000us-gaap_DeferredPolicyAcquisitionCosts | 15,899,000us-gaap_DeferredPolicyAcquisitionCosts | 17,282,000us-gaap_DeferredPolicyAcquisitionCosts
Deferred policy acquisition costs, net, difference percentage |  |  | 13.00%uve_DeferredPolicyAcquisitionCostsNetDifferencePercentage |  |
Deferred policy acquisition costs, pre-tax charge against earnings | 1,600,000uve_DeferredPolicyAcquisitionCostsNetDifferenceAmount |  |  |  |
Maximum amortization period for capitalized cost |  | 12 months |  |  |
Maximum [Member] |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Amount insured per depositor under FDIC insurance coverage |  | 250,000us-gaap_CashFDICInsuredAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Useful life of property and equipment |  | 27 years 6 months |  |  |
Number of installments to pay policy premiums |  | 4uve_NumberOfInstallmentsToPayPolicyPremiums / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Maximum [Member] | Acquisition-Related Costs [Member] |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred policy acquisition costs |  |  | 13,000,000us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_NonrecurringAdjustmentAxis = us-gaap_AcquisitionRelatedCostsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Short-term investment maturity period |  | 3 months |  |  |
Useful life of property and equipment |  | 3 years |  |  |
Number of installments to pay policy premiums |  | 2uve_NumberOfInstallmentsToPayPolicyPremiums / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Minimum | Acquisition-Related Costs [Member] |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred policy acquisition costs |  |  | $ 11,400,000us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_NonrecurringAdjustmentAxis = us-gaap_AcquisitionRelatedCostsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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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 The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Change, presented in dollar amount, of deferred acquisition cost due to adoption of new guidance. + References No definition available. + Details
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- Definition Change, presented as a percentage, of deferred acquisition cost due to adoption of new guidance. + References No definition available. + Details
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- Definition Maximum amortization period for policy acquisition costs capitalized and deferred over the term of the policy. + References No definition available. + Details
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- Definition Maximum maturity period allowable for liquid investments to be classified as cash and cash equivalents. + References No definition available. + Details
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- Definition Number of installments to pay policy premiums under an installment payment program. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Losses accrued on insurance contracts when estimated future claims and maintenance costs under a group of existing contracts will exceed anticipated future premiums. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Definition Maturity period allowable for investments to be classified as short-term investments. + References No definition available. + Details
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- Details
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