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Acquisitions (Wolverine Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended
Apr. 16, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]        
Goodwill   $ 68,253,000us-gaap_Goodwill $ 68,214,000us-gaap_Goodwill $ 50,485,000us-gaap_Goodwill
Wolverine and Wolverine Joining        
Business Acquisition [Line Items]        
Purchase price 59,700,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
     
Final working capital and other adjustments 300,000hnh_BusinessCombinationWorkingCapitalAdjustments
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
     
Employee severance charges 400,000us-gaap_SeveranceCosts1
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
     
Goodwill 14,767,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
     
Other intangibles 13,657,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
     
Useful lives (in years)   20 years    
Sales   64,700,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
43,300,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
 
Operating income   100,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
1,600,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
 
Intercompany sales   5,800,000hnh_BusinessCombinationProFormaInformationIntercompanySalesSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
3,500,000hnh_BusinessCombinationProFormaInformationIntercompanySalesSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
 
Acquisition-related costs     600,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
 
Fair value adjustment     500,000us-gaap_AssetsFairValueAdjustment
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
 
Trade Names | Wolverine and Wolverine Joining        
Business Acquisition [Line Items]        
Other intangibles 4,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Customer Relationships | Wolverine and Wolverine Joining        
Business Acquisition [Line Items]        
Other intangibles $ 9,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hnh_WolverineTubeInc.andWolverineJoiningTechnologiesLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember