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Debt (Interest Rate Swap Agreements (Details) (Interest rate swap agreements, USD $)
Jun. 30, 2013
Feb. 28, 2013
Interest rate swap agreements
    
Debt Instrument [Line Items]    
Fixed interest rate (as a percent) 0.598%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 0.569%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Notional Value $ 5,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 56,400,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Notional value 2013 100,000hnh_DerivativeNotionalAmountNextTwelveMonths
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 1,100,000hnh_DerivativeNotionalAmountNextTwelveMonths
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Notional value 2014 200,000hnh_DerivativeNotionalAmountYearTwo
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 1,800,000hnh_DerivativeNotionalAmountYearTwo
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Notional value 2015 $ 200,000hnh_DerivativeNotionalAmountYearThree
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 2,200,000hnh_DerivativeNotionalAmountYearThree
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember