For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of participating insurance contract to insurance contracts in force.

+ References

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-Topic 944
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- Definition

Percentage of participating insurance to premium income.

+ References

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- References

No definition available.

+ Details

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- Definition

Maximum that will be retained by the entity, which includes accidental death benefits on any one life.

+ References

No definition available.

+ Details

Name:	utgn_RetentionAmountLimitPerOnePerson
Namespace Prefix:	utgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ReinsurerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=utgn_LifeInsuranceCededMember
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Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=utgn_DirectPremiumCollectedMember
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- Details

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- Details

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Concentrations of Credit Risk (Details)	3 Months Ended	12 Months Ended
Concentrations of Credit Risk (Details)	Mar. 31, 2019 USD ($) State	Dec. 31, 2018	Dec. 31, 2017
Concentrations [Abstract]
Number of states by which entity primarily serves \| State	4
Maximum retention limits per life \| $	$ 125,000
Reinsurer Concentration Risk [Member] \| Life Insurance Ceded [Member]
Concentrations [Abstract]
Percentage of gross insurance in force		20.00%	20.00%
Percentage of premium income		29.00%	24.00%
Direct Premium Collected [Member] \| Geographic Concentration Risk [Member] \| Illinois, Ohio, Texas and West Virginia [Member]
Concentrations [Abstract]
Concentration risk, percentage	56.00%	55.00%
Invested Assets [Member] \| Customer Concentration Risk [Member] \| Oil and Gas Industry [Member]
Concentrations [Abstract]
Concentration risk, percentage	28.00%	25.00%