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Summary of Significant Accounting Policies - Schedule of Estimated Useful Life of Property and Equipment (Details) (Fortman Insurance Agency, LLC) - Fortman Insurance Agency, LLC [Member] | 12 Months Ended
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Dec. 31, 2018
Land Improvements [Member] |
Estimated useful life | 15 years
Vehicles [Member] |
Estimated useful life | 5 years
Office Equipment Furniture And Fixtures [Member] |
Estimated useful life | 7 years

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=RELI_FortmanInsuranceAgencyLLCMember
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Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=RELI_OfficeEquipmentFurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |