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Debt (WHX CS Loan) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 03, 2014
Debt Instrument [Line Items]      
Long-term Debt 202,801,000us-gaap_LongTermDebt $ 156,887,000us-gaap_LongTermDebt  
WHX CS Corp. | Secured Debt      
Debt Instrument [Line Items]      
Long-term Debt     $ 15,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= hnh_WHXCSCorp.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Variable rate basis LIBOR    
Basis spread on variable rate (as a percentage) 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= hnh_WHXCSCorp.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember