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Real Estate Inventory (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate [Abstract] |  |  |
Real estate inventory, selling price |  |  | $ 4.1
Lease agreement term |  | 5 years |
Annual rental payments |  | $ 0.7 |
Rental income |  |  | $ 0.3
Sale of real estate inventory | $ 4.1 |  |
Real Estate, Inventory Post Write-down Carrying Value | 3.7 |  |
Closing costs on sale of real estate inventory | 0.3 |  |
Gross profit realized on sale of real estate inventory | $ 0.1 |  |

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- Definition The yearly payments due under the lease entered into in. + References No definition available. + Details
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Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Closing cost on sale of real estate inventory. + References No definition available. + Details
Name: | hgbl_ClosingCostOnSaleOfRealEstateInventory
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Profit on sale of real estate inventory. + References No definition available. + Details
Name: | hgbl_ProfitOnSaleOfRealEstateInventory
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Real estate inventory post write down carrying value. + References No definition available. + Details
Name: | hgbl_RealEstateInventoryPostWriteDownCarryingValue
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition List price of real estate for sale + References No definition available. + Details
Name: | hgbl_RealEstateListPrice
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental income operating. + References No definition available. + Details
Name: | hgbl_RentalIncomeOperating
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sale of real estate inventory. + References No definition available. + Details
Name: | hgbl_SaleOfRealEstateInventory
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LessorLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration