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Acquisition of National Loan Exchange, Inc. (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 5 Months Ended 7 Months Ended 12 Months Ended
Jun. 02, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Cash Consideration for Business Acquisition $ 2,000us-gaap_PaymentsToAcquireBusinessesGross      
Business Combination, Contingent Consideration Arrangements, Description Under the terms of the NLEX purchase agreement, the Company will pay, to the former owner of NLEX, 50% of gross revenues of NLEX and its affiliates, minus 50% of certain expenses, for each of the four years following the closing. The payments are due on or about July 30 of each year, beginning in 2015. The contingent consideration is capped at an aggregate of $5,000, and at December 31, 2014, subject to the application of a 9% discount rate, is estimated to have a present value of $4,198.      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 5,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh      
Discount rate 9.00%us-gaap_FairValueInputsDiscountRate      
Weighted average cost of capital 31.60%hgbl_WeightedAverageCostOfCapital      
Contingent consideration   4,198us-gaap_BusinessCombinationContingentConsiderationLiability 4,198us-gaap_BusinessCombinationContingentConsiderationLiability  
Contingent consideration, current   803us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent 803us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent 0us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Contingent consideration, non-current   3,395us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent 3,395us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Accretion of contingent consideration discount   210us-gaap_AccretionOfDiscount 210us-gaap_AccretionOfDiscount 0us-gaap_AccretionOfDiscount
Goodwill   8,846us-gaap_Goodwill 8,846us-gaap_Goodwill 5,301us-gaap_Goodwill
NLEX [Member]        
Goodwill $ 3,545us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hgbl_NlexMember		 $ 3,545us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hgbl_NlexMember		 $ 3,545us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hgbl_NlexMember		 $ 0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hgbl_NlexMember