10-Year Constant Maturity Interest Rate

No definition available.

Name:	uihc_A10YearConstantMaturityInterestRate
Namespace Prefix:	uihc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash Flow Coverage Ratio

+ References

No definition available.

+ Details

Name:	uihc_CashFlowCoverageRatio
Namespace Prefix:	uihc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument capital contribution for surplus definition for purposes of caclulating the required ratios

+ References

No definition available.

+ Details

Name:	uihc_DebtInstrumentSurplusDefinition
Namespace Prefix:	uihc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Required Balance in Interest Bearing Account

+ References

No definition available.

+ Details

Name:	uihc_RequiredBalanceinInterestBearingAccount
Namespace Prefix:	uihc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Required Balance in Non-Interest Bearing Account

+ References

No definition available.

+ Details

Name:	uihc_RequiredBalanceinNonInterestBearingAccount
Namespace Prefix:	uihc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Required Written Premiums To Surplus Ratio

+ References

No definition available.

+ Details

Name:	uihc_RequiredWrittenPremiumsToSurplusRatio
Namespace Prefix:	uihc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

Name:	us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uihc_WritingRatioTypesAxis=uihc_GrossandNetWritingRatioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=uihc_TenYearConstantMaturityTreasuryRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uihc_WritingRatioTypesAxis=uihc_GrossWritingRatioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uihc_WritingRatioTypesAxis=uihc_NetWritingRatioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uihc_WritingRatioTypesAxis=uihc_OtherThanGrossandNetWritingRatioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=uihc_InterboroLLCPromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=uihc_BBTTermNotePayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	uihc_WritingRatioTypesAxis=uihc_NonrecurringLossMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt (Details) $ in Thousands	3 Months Ended
Long-Term Debt (Details) $ in Thousands	Mar. 31, 2017 USD ($) Rate	Dec. 31, 2016 USD ($)	Dec. 05, 2016 USD ($) Rate	May 26, 2016 USD ($)
Debt Instrument
Notes Payable	$ 53,822	$ 54,175
Effective rate at period end	2.40%
Florida State Board of Administration Note Payable
Debt Instrument
Notes Payable	$ 10,882	$ 11,176
Interest rate (percentage)	2.49%	1.56%
Statutory capital and surplus required	$ 12,254
Capital contributed to surplus	20,000
Debt Instrument, Periodic Payment, Principal	294
Debt Instrument, Periodic Payment, Interest	$ 70
Florida State Board of Administration Note Payable \| Gross and Net Writing Ratio \| 10-Year Constant Maturity Treasury Rate
Debt Instrument
Basis spread on variable rate \| Rate	4.50%
Florida State Board of Administration Note Payable \| Gross Writing Ratio
Debt Instrument
Required written premiums to surplus ratio	6
Florida State Board of Administration Note Payable \| Gross Writing Ratio \| Minimum
Debt Instrument
Required written premiums to surplus ratio	4.5
Florida State Board of Administration Note Payable \| Net Writing Ratio
Debt Instrument
Required written premiums to surplus ratio	2
Florida State Board of Administration Note Payable \| Net Writing Ratio \| Minimum
Debt Instrument
Required written premiums to surplus ratio	1.5
Florida State Board of Administration Note Payable \| Other Than Gross and Net Writing Ratio \| Stated Rate
Debt Instrument
Basis spread on variable rate \| Rate	0.25%
Interboro, LLC Promissory Note
Debt Instrument
Notes Payable	$ 8,550
Interest rate (percentage)	6.00%
BB&T Term Note Payable
Debt Instrument
Notes Payable	$ 4,911	$ 4,998		$ 5,200
Interest rate (percentage)	2.44%			1.65%
Debt Instrument, Periodic Payment, Principal	$ 87
Debt Instrument, Periodic Payment, Interest	$ 30
BB&T Term Note Payable \| Minimum
Debt Instrument
Cash Flow Coverage Ratio	1.2
Required Balance in Interest Bearing Account	$ 1,500
Required Balance in Non-Interest Bearing Account	$ 500
BB&T Term Note Payable \| Non-recurring Loss \| Minimum
Debt Instrument
Cash Flow Coverage Ratio	1.0
Senior Notes
Debt Instrument
Notes Payable			$ 30,000
Interest rate (percentage) \| Rate			5.75%
Debt Instrument, Periodic Payment, Interest	$ 634