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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Asset liquidation revenue $ 14,186us-gaap_SalesRevenueNet $ 8,068us-gaap_SalesRevenueNet
HGP Europe [Member]    
Asset liquidation revenue $ 2,985us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= hgbl_HgpEuropeMember
$ 236us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= hgbl_HgpEuropeMember