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Employee Benefit Plan - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Benefit Plan [Abstract] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent | 100.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.00% |  |
Defined Contribution Plan, Cost | $ 1,381 | $ 787 | $ 861

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- Definition Employee Benefit Plan [Abstract] + References No definition available. + Details
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Namespace Prefix: | uihc_
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Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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