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Equity Method Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Jun. 30, 2010 | Jun. 30, 2009 | Dec. 31, 2007
Net investment at balance sheet date | $ 156 us-gaap_EquityMethodInvestments | $ 1,769 us-gaap_EquityMethodInvestments |  |  |  |
Gain on sale of investment | 551 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | 0 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal |  |  |  |
Accounts Receivable, from Equity Investment | 3,043 us-gaap_AccountsNotesAndLoansReceivableNetCurrent | 1,670 us-gaap_AccountsNotesAndLoansReceivableNetCurrent |  |  |  |
Polaroid Corporation [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_PolaroidCorporationMember |
Non-Asset Liquidation Equity Investment Acquired |  |  |  | 275 us-gaap_InvestmentOwnedAtCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_PolaroidCorporationMember | 2,620 us-gaap_InvestmentOwnedAtCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_PolaroidCorporationMember |
Gain on sale of investment | 551 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_PolaroidCorporationMember |  |  |  |  |
Accounts Receivable, from Equity Investment | 1,992 us-gaap_AccountsNotesAndLoansReceivableNetCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_PolaroidCorporationMember |  |  |  |  |
Knight's Bridge Capital Partners Internet Fund No. 1 GP LLC [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 33.33%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_KnightsBridgeCapitalPartnersInternetFundNo1GPLlcMember
Non-Asset Liquidation Equity Investment Acquired |  |  |  |  |  | 20 us-gaap_InvestmentOwnedAtCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_KnightsBridgeCapitalPartnersInternetFundNo1GPLlcMember
Net investment at balance sheet date | 156 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_KnightsBridgeCapitalPartnersInternetFundNo1GPLlcMember | 19 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_KnightsBridgeCapitalPartnersInternetFundNo1GPLlcMember |  |  |  |
Equity Method Investment, Additional Information | 136 hgbl_EquityMethodInvestmentDistributionReceivable / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_KnightsBridgeCapitalPartnersInternetFundNo1GPLlcMember |  |  |  |  |
Share of profits distribution |  |  | $ 140 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hgbl_KnightsBridgeCapitalPartnersInternetFundNo1GPLlcMember |  |  |

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- Definition The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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