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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable (Payable) and Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
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Reinsurance Disclosures [Abstract] |  |  |  |  |  |
Prepaid reinsurance premiums | $ 285,480 |  | $ 124,385 |  |  |
Reinsurance recoverable on unpaid losses and LAE | 1,393 | $ (2,353) | 106 | $ 2,958 | $ 7,709 | $ 13,540
Reinsurance recoverable (payable) on paid losses | 1,318 |  | (1,532) |  |  |
Reinsurance receivable, net |  |  | 186 |  |  |
Reinsurance recoverable (payable) and receivable | $ 2,711 |  | $ (1,240) |  |  |

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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 -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition Reinsurance receivable, net. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sum of the carrying amounts as of the balance sheet date of all reinsurance recoverable (payable) and receivable. + References No definition available. + Details
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- Definition Reinsurance recoverable (payable) for unpaid claims and claims adjustments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount, after valuation allowance, recoverable (payable) under reinsurance contracts for losses reported to and paid by the ceding insurer. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant