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Schedule of Company's Share of Revenues and Operating Income Earned from the Joint Ventures in Which it is Invested (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Equity Method Investments And Joint Ventures [Abstract] |  |
Revenues | $ 66 | $ 198
Operating income | $ 47 | $ 52

X
- Definition The amount of gross revenues (loss) reported by an Asset Liquidation Investment of the Company, and attributable to the Company as its share. + References No definition available. + Details
Name: | hgbl_AssetLiquidationInvestmentSummarizedFinancialInformationRevenue
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Company's proportionate share of Joint Ventures' net income (loss) reported in the consolidated statement of operations as Earnings (Loss) of Equity Accounted Asset Liquidation Investments and attributable to the Company as its share. + References No definition available. + Details
Name: | hgbl_EarningsOfEquityAccountedAssetLiquidationInvestments
Namespace Prefix: | hgbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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