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Inventories (Supplemental Information) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Precious metals stated at LIFO cost $ 4,684us-gaap_LIFOInventoryAmount $ 5,090us-gaap_LIFOInventoryAmount
Precious metals stated under non-LIFO cost methods, primarily at fair value $ 12,165hnh_PreciousMetalsStatedUnderNonLIFOCostMethods $ 13,687hnh_PreciousMetalsStatedUnderNonLIFOCostMethods
Market value per ounce: (in dollars per ounce)    
Silver 15.75hnh_MarketValuePerOunceSilver 19.49hnh_MarketValuePerOunceSilver
Gold 1,199.25hnh_MarketValuePerOunceGold 1,201.50hnh_MarketValuePerOunceGold
Palladium 798.00hnh_MarketValuePerOuncePalladium 711.00hnh_MarketValuePerOuncePalladium